QCL OEM Series Product Datasheet

QCL OEM Series Product Datasheet
DATASHEET AND OPERATING GUIDE
QCL OEM Series
Low-Noise Quantum Cascade Laser Driver
FEATURES AND BENEFITS
• Off-the-shelf models at 500 mA, 1 A, 1.5 A, 2 A
• Can be delivered in other current ranges up to 2 A
• Compliance voltage 16 V (standard),
Compliance 7-20 V with factory modification
• Safety features protect your QCL investment
»» Adjustable soft-clamping current limit
»» Brown-out, reverse-voltage, & over-voltage
protection
»» Driver over-temperature protection circuit
»» Relay shorts output when current is disabled
• Local and Remote Power-On and Enable control,
TTL-compatible
• Analog modulation input between -5V and +5V.
LOWEST-NOISE DRIVER AVAILABLE
APPLICATIONS
The QCL OEM Series drivers use patented1 circuitry to
produce the lowest current noise density of any commercially
available QCL driver. The 500 mA QCL driver exhibits noise
performance of 0.4 μA RMS to 100 kHz, and average current
noise density of 1 nA / √Hz—the lowest available.
The QCL Series drivers are used in trace element detection
systems, both laboratory-based and field-deployed.
This driver is well suited to applications requiring fast
measurement times and ultra high sensitivity.
ULTRA-NARROW QCL LINEWIDTH
In order to maintain their characteristically tight center
linewidths and minimize jitter, quantum cascade lasers must
be powered by drivers with exceptionally low current noise
density. Our customers have reported achieving narrower
linewidths with these drivers than any other they’ve used.
1. Covered by U.S. Patents 6,696,887; 6,867,644 and 7,176,755. Licensed from
Battelle Memorial Institute.
CONTENTS
PAGE
Pb
Compliant
QUICK CONNECT GUIDE
PIN DESCRIPTIONS
ELECTRICAL SPECIFICATIONS
SAFETY INFORMATION
OPERATING INSTRUCTIONS
TROUBLESHOOTING
TECHNICAL SUPPORT INFORMATION
MECHANICAL SPECIFICATIONS
CERTIFICATION AND WARRANTY
2
3
5
7
8
13
14
22
23
e
RoHS
406-587-4910
www.teamWavelength.com
REVERSE POLARITY AVAILABLE
Often, with epi-down configurations of a QCL, the exit
lead is attached to the case and it is desirable to ground
it. Now, the reverse polarity driver, a current source, is
also available in the OEM package. See QCL OEM(+).
PROTECT YOUR QCL INVESTMENT
All the essential control and monitor functions you expect in
a Wavelength laser driver are incorporated into this driver,
along with protection circuitry to safeguard your QCL from
minor power source faults, over-temperature conditions,
and electrical faults.
ORDERING INFORMATION
PART NO
DESCRIPTION
QCL500 OEM
500 mA Low Noise QCL Driver
QCL1000 OEM
1.0 A Low Noise QCL Driver
QCL1500 OEM
1.5 A Low Noise QCL Driver
QCL2000 OEM
2.0 A Low Noise QCL Driver
QCL OEM(+) Series
Positive polarity OEM models
PWRPAK-24V
24 VDC switching power supply
(2x required)
WCB312
Dual power supply wiring kit
NOISESCAN
Noise characterization scan
55-110014
SMA-BNC low noise cable
WCB310
SMA-SMA low noise cable
QCLTL Series
Test load kits for the QCL OEM
Applies to Product Revisions A – D
© May 2017
QCL OEM SERIES LOW-NOISE DRIVER
Figure 2 shows the wiring diagram for the QCL driver and
external electronics. If you are using the Remote Power
On and Remote Enable functions, refer to page 11 for
switch configuration instructions.
QUICK CONNECT GUIDE
!
To ensure safe operation of the QCL driver, it
is imperative that you determine that the unit
will be operating within the internal heat
dissipation Safe Operating Area (SOA).
For setup and configuration, we recommend using a test
load in place of the laser (Figure 3). Recommended test
load for 0 to 1.5 A operation, RLOAD = 10 Ω, 50 W, metal
film resistor:
• Wavelength part number QCL TEST LOAD (available
for < 1 A and 1.5 A current ranges)
• Caddock MP850-10-1%
• Ohmite TCH35P10R0JE
Visit the Wavelength Electronics website for the most
accurate, up-to-date, and easy to use SOA calculator:
http://www.teamwavelength.com/support/calculator/soa/soald.php
Recommended test load for 1.5 A to 2 A operation,
RLOAD = 5 Ω, 50 W, metal film resistor:
Figure 1 shows the front panel of the QCL OEM driver and
the locations of the Power and Enable switches, Analog In
and QCL SMA connectors, and SET and LIMIT trimpots.
• Wavelength part number QCL TEST LOAD (available
for 1.5 A, and 2 A current ranges)
• Caddock MP850-5.00-1%
QCL1500
ANALOG
SET
QCL
POWER
ON
ENABLE
01D105409201
RLOAD
LIMIT
ON
FAULT
Covered by U.S.
Patents 6,696,887,
6,867,644 and
7,176,755.
Pin J5-4, or
QCL SMA Shield
Pin J5-3, or
QCL SMA Center Pin
Figure 3. Test Load
Figure 1. QCL Driver Front Panel
TTL Optional Remote Power On
HI = On; Low = Disabled
TTL Optional Remote Enable
HI = Enabled; Low = Disabled
J1
DVM
-
Optional Analog Setpoint
(-5 V to +5 V)
+
14
13
12
11
10
9
8
7
6
5
4
3
2
1
J4
+
V+
3
2
1
_
_
+
150 kΩ
V−
J5
4
3
2
1
3
Earth
Ground
Reserved
Remote Power On –
1
Remote Power On +
Remote Enable –
1
Remote Enable +
Output Enable Status
Power Status
Overtemp Fault Status
Current Setpoint Monitor
Current Output Monitor
Limit Monitor
Monitor Ground
Analog Input
Analog Input Gnd
V+
V–
PGND
QCL+ (Ground)
QCL–
GND
+5V AUX
NOTES
1. The Remote Power On − and
Remote Enable − inputs can be
optically isolated from ground.
QCL
2. The SMA connectors are electrically
isolated from the QCL chassis.
ANALOG
SMA
2
2
QCL
SMA
POWER
ENABLE
3. The 150 kΩ resistor is required in
some circumstances. Refer to the
section on wiring the power supplies.
Figure 2. QCL Wiring Diagram, Revision D
© 2016
www.teamWavelength.com
2
QCL OEM SERIES LOW-NOISE DRIVER
PIN DESCRIPTIONS
Table 1. Pin Descriptions, WCB31X Cable Descriptions
PIN
NAME
SYMBOL
COLOR
PIN DESCRIPTION
Connector J1, WCB311 14-Pin Input/Output Cable
1
Analog In GND
Red
Ground for analog setpoint input. Pin is not rated for high current return.
2
Analog In
Black
Analog setpoint input. The voltage input on this pin sums with the onboard
setpoint trimpot. Input impedance 1 kΩ. Transfer function varies by model—
refer to Table 3. Damage threshold is ±10V.
3
Monitor Ground
Black
Low current ground used with monitor pins J1:4, 5, and 6. Also used as the
current return path for status output pins J1:7, 8, and 9.
This pin is not rated for high current.
4
Current Limit
Monitor
LIM_MON
Red
Current limit monitor. Transfer function varies by model­—refer to Table 3.
Range 0 to 5 V.
5
Current Output
Monitor1
OUT_MON
Brown
Current output monitor. Transfer function varies by model—refer to Table 3.
Range 0 to 5 V on Revision D models. Refer to note 1 for range of previous
instrument revisions.
6
Current Setpoint
Monitor
SET_MON
White
Current setpoint monitor. Transfer function varies by model—refer to
Table 3. Range 0 to 5 V.
7
Overtemp Fault
Status
Orange
Overtemp Fault = HI. Indicates internal components are above safe
operating temperature and the output has switched off. Can drive an
indicator LED, sourcing up to 25 mA at 12 V.
8
Power Status
Green
Power On = HI. Can drive an indicator LED, sourcing up to 25 mA at 12 V.
9
Output Enable
Status
Blue
Output Enabled = HI. Can be used to drive an indicator LED, sourcing up to
25 mA at 12 V.
10
Remote Enable +
Red
Remote Output Enable signal. TTL-compatible. DISABLE = LO (< 5 V),
ENABLE = HI (5 to 12 V). Toggle to reset a protection circuit fault.
11
Remote Enable –
Green
Return for Remote Enable signal. Can be optically isolated from the
instrument ground; see page 11.
12
Remote Power On +
White
Remote Power On signal. TTL-compatible. OFF = LO (< 5 V),
ON = HI (5 to 12 V). Toggle to reset a protection circuit error.
13
Remote Power On –
Black
Return for Remote Power On signal. Can be optically isolated from the
instrument ground; see page 11.
14
Reserved
–
Connector J4, WCB313 3-Pin QCL Power Cable
1
PGND
Black
High current return, connect to power supplies.
2
V–
White
Negative DC power supply input. Typically –24 VDC. Other input voltage
ranges can be used with product variations—contact Sales for information.
3
V+
Red
Positive DC power supply input. Typically 24 VDC. Other input voltage
ranges can be used with product variations—contact Sales for information.
Connector J5, WCB314 4-Pin QCL Load Cable
1
+5V AUX
Green
+5V power supply output. Use pin 2 of this connector for the return. Refer to
page 10 for information on configuring this power supply output.
2
GND
White
Ground connection for +5V AUX. This pin is always connected to ground,
regardless of the configuration state of the +5V AUX output.
3
QCL –
Red
Current from the QCL sinks to this pin. Refer to Figure 2.
4
QCL + (GND)
Black
Ground connection. QCL current sources from this pin. Refer to Figure 2.
1. Product revision is indicated by the third digit of the serial number engraved on the front panel. Refer to page 14 for transfer
functions for Revisions A through C.
© 2016
www.teamWavelength.com
3
QCL OEM SERIES LOW-NOISE DRIVER
PIN DESCRIPTIONS (CONTINUED)
Table 2. Front Panel SMA Connector Descriptions
FRONT-PANEL SMA CONNECTORS
Left SMA, Center Pin
Analog In
Analog setpoint input. The voltage input on this pin sums with the onboard setpoint trimpot.
Input impedance 1 kΩ. Transfer function varies by model—refer to Table 3. The analog
input voltage can be negative.
Left SMA, Shield
Analog In GND
Ground for analog setpoint input. Pin is not rated for high current return.
Right SMA, Center Pin
QCL –
Current from the QCL sinks to this pin. Refer to Figure 2.
Right SMA, Shield
QCL + (Ground)
Ground connection. QCL current sources from this pin. Refer to Figure 2.
Table 3. Current Limit Monitor and Setpoint Transfer Functions—Revision D*
FUNCTION
SYMBOL
QCL125
QCL500
QCL1000
QCL1500
QCL2000
Analog Setpoint Monitor
SET_MON
0.025 A / V
0.1 A / V
0.2 A / V
0.3 A / V
0.4 A / V
Analog Monitor Ground
OUT_MON
0.025 A / V
0.1 A / V
0.2 A / V
0.3 A / V
0.4 A / V
Current Limit Monitor
LIM_MON
0.025 A / V
0.1 A / V
0.2 A / V
0.3 A / V
0.4 A / V
VANALOG
0.025 A / V
0.1 A / V
0.2 A / V
0.3 A / V
0.4 A / V
Analog Input
* For transfer function information on product revisions A – C, refer to page 14.
© 2016
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4
QCL OEM SERIES LOW-NOISE DRIVER
ELECTRICAL SPECIFICATIONS
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
NOTE
ABSOLUTE MAXIMUM RATINGS
If a Product Variation
modified your QCL OEM,
maximum ratings change:
Positive Supply Voltage1
V+
25
VDC
!
PV #
MA X V
COMPLIANCE
PV055
±19
+11
PV066
±15
+7
PV072
+24 /
-28
+20
The PV number can be found
on the front panel below the
model and lot numbers:
Negative Supply Voltage1
V–
-25
VDC
16
W
@ 25ºC, no air movement.
Reference SOA charts
ºC
35ºC max for QCL2000 OEM
Internal Power Dissipation2
PMAX
Operating Temperature Range2
TOPR
-40 to 50
Storage Temperature Range
TSTG
-55 to 125
ºC
2
lbs
5.5 x 6.55 x 2.3
inches
Weight
Size
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
139.7 x 166.4 x 58.4 mm
NOTE
OUTPUT CURRENT
Max Output Current
IMAX
0.5, 1.0, 1.5, 2.0
A
Compliance Voltage3
VCOMP
16
V
with ±24 VDC power supplies
Short Term Stability, 1 hr
5
10
15
ppm
25ºC
Long Term Stability, 24 hr
5
10
15
ppm
25ºC
Temperature Coefficient
5
10
18
ppm / ºC
Delayed Start
1.25
Slow Start Ramp
Leakage Current
sec
100
0.75
msec
2
3
to full scale
mA
MODULATION
Rise / Fall Time
Slew Rate
Depth of Modulation4
Bandwidth, 3 dB
250 / 200
nsec
30
V / µsec
90%
to full scale
at 500 kHz
2
3
MHz
1. Supply voltage can be changed; see page 16, and contact Sales, for information about Product Variations.
2. Derating begins at 25ºC. QCL2000 maximum operating temperature is 35ºC.
3. Compliance voltage can be increased to 20 V with Product variation PV072; requires +24 V and -28 V power supplies. Lower power
supply input voltages are available by Product Variation. See page 16, and contact Sales, for information on Product Variations.
4. Peak-to-Peak output amplitude decreases as frequency increases;
see figure at right. Also see page 16.
Full Current
95 %
100 %
90 %
5%
0 mA
100% Depth of Modulation at 10 Hz
© 2016
www.teamWavelength.com
0%
90% Depth of Modulation at 100 kHz
5
QCL OEM SERIES LOW-NOISE DRIVER
ELECTRICAL SPECIFICATIONS, Continued
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
NOTE
µA RMS
100 kHz bandwidth
IOUT = 500 mA
nA / √Hz
RLOAD = 10 Ω
IOUT = 500 mA
NOISE
RMS Noise Current 5,6
QCL500
QCL1000
QCL1500
QCL2000
0.4
0.7
1.0
1.3
Average Noise Current Density 5,6
QCL500
QCL1000
QCL1500
QCL2000
1.0
2.0
3.0
4.0
POWER SUPPLY
Positive Supply Voltage1
Negative Supply Voltage
1
V+
22
V–
-22
24
25
VDC
-24
-25
VDC
Quiescent Current, V+ Supply
250
mA
Quiescent Current, V– Supply
100
mA
Inrush Current Requirement2
450
mA
-5 to +5
V
INPUTS
Analog Input Range
ANALOG
Input Pin Impedance
1000
Analog Input Damage Threshold
-10
Remote Enable and
Remote Power ON
Ω
10
V
TTL Input; must supply min of 5 mA.
LO = < 5 V, HI = 5 to 12 V
HI = ON,
LO = DISABLED / OFF
MONITORS AND OUTPUTS
Current Setpoint Monitor Range
Current Setpoint Monitor Accuracy
Current Output Monitor Range
Current Monitor Bandwidth, 3 dB
SET_MON
0
OUT_MON
0
4
Current Monitor Stability
Accuracy, Monitor to Actual Current
Limit Monitor Range
5
5
3
%
5
Accuracy, Limit Monitor to Actual Limit
MHz
25
ppm
0.4
mA
5.75
0.1
Status Outputs
(Overtemp, Power, Enable)
V
1.8
1.5
LIM_MON
V
V
%
Active HI
12 V output, source up to 25 mA
+5V AUX POWER SUPPLY OUTPUT
Output Voltage
+5V AUX
5
Output Current
VDC
500
Selectable via internal
jumper; see page 10
mA
1. Supply voltage can be changed; see page 16, and contact Sales, for information about Product Variations.
2. Negative power supply must source at least 450 mA. If current to QCL exceeds 450 mA, DC power supply capacity must be (QCL
Current) + (Quiescent Current).
3. Current Setpoint Monitor is a reference signal only, and may deviate from actual setpoint by up to 5%.
4. Monitor bandwidth is less than the bandwidth of the current source. To monitor high frequency performance at full compliance,
monitor output across a test load only. Do not place measurement equipment across an actual QCL—measurement equipment
transients may damage or destroy the laser.
5. See technical note TN-LD02: “How is Current Noise Measured at Wavelength Electronics?”
6. We recommend that setpoint is below 85% of the current limit, because the noise level introduced into the QCL rises when
operating close to the current limit.
© 2016
www.teamWavelength.com
6
QCL OEM SERIES LOW-NOISE DRIVER
SAFETY INFORMATION
THEORY OF OPERATION
SAFE OPERATING AREA — DO NOT EXCEED
INTERNAL POWER DISSIPATION LIMITS
The QCL Series low noise drivers are designed expressly
to drive quantum cascade lasers, and utilize patented1
circuitry to deliver ultra-low noise current and still maintain a
wide modulation bandwidth.
Before attempting to operate the QCL OEM driver, it is
imperative that you first determine that the unit will operate
within the Safe Operating Area (SOA). Operating the unit
outside of the SOA may damage the driver and the QCL.
Operating outside of the SOA will void the warranty.
To determine if the QCL driver is suitable for your application
and if it will be operating in the safe range, consult the
on‑line instructions for calculating the Safe Operating Area:
http://www.teamwavelength.com/support/calculator/soa/soald.php
If you have questions about the Safe Operating Area
calculator, call the factory for free and prompt technical
assistance.
!
To ensure safe operation of the QCL
controller, it is imperative that you determine
if the unit is going to be operating within the
internal heat dissipation Safe Operating Area
(SOA).
USER SERVICEABLE COMPONENTS
The QCL driver is equipped with user-serviceable fuses.
Refer to page 15 if the fuses need to be replaced.
If you believe your controller needs maintenance or repair,
please contact the factory immediately and do not attempt
to maintain or repair the unit yourself.
The QCL drivers are controlled current sources; they deliver
the current commanded by the setpoint. The current source
continually monitors the actual output current, compares it
to the setpoint, and adjusts the current if there is a difference
between the two signals.
It may be useful to remember that you do not directly set
the drive current setpoint. Instead, you adjust a voltage
signal that represents the output current; the voltage is set
either with the onboard trimpots or by an external input. The
voltage and output current are related by a transfer function,
described in Table 3. The current limit is set in a similar
manner.
As current is driven through the load, there is a voltage drop
across the load. As the current increases, the voltage drop
may increase to the point that it reaches the Compliance
Voltage limit of the current source. Once that occurs the
current source is no longer able to increase the current
driven to the load even if you increase the setpoint
The QCL OEM driver includes features that help protect
your laser, and also make the driver more versatile in a wide
array of applications. These features are explained in detail
in the Operating Instructions.
• The user-adjustable soft-clamping current limit prevents
overdriving the laser even if the analog input signal
setpoint is above the maximum drive current for the
laser. Details on current limit function are provided on
page 9.
• Over- and under-voltage protection circuits protect the
driver and QCL if the power supply voltages fall outside
of the acceptable operating range.
• Over-temperature protection circuits safely shut down
the output if the internal temperature of the QCL driver
rises to an unsafe level.
• Output slow-start ramps the current to setpoint over
100 msec.
• A mechanical relay shorts the output connections when
the output is disabled, and when the QCL driver is
powered off.
The Analog Input can be used for adding to or subtracting
from the internal setpoint on the QCL OEM. Inputting
positive voltages will result in adding to the setpoint, while
inputting negative voltages will result in subtracting from the
setpoint.
1. Covered by U.S. Patents 6,696,887; 6,867,644 and 7,176,755.
Licensed from Battelle Memorial Institute.
© 2016
www.teamWavelength.com
7
QCL OEM SERIES LOW-NOISE DRIVER
OPERATING INSTRUCTIONS
These instructions are written for the most common
operating mode of the QCL driver.
The controller is first configured for local control in order to
set the drive current limit. Then the controller is reconfigured
according to the actual application. We recommend using a
test load until you are familiar with operation of the driver.
NECESSARY EQUIPMENT
• QCL Driver and QCL
• Digital multimeter (DMM), 4-½ digit resolution
recommended
• Low-noise power supplies, 24 VDC; two required for
bipolar power supply input
• Connector and cables for remote inputs and QCL output
• Connecting wires
• Test Load; recommended for driver setup
We recommend using the following equipment available
from Wavelength Electronics:
• PWRPAK-24V – 24 V switching power supply;
two required
• WCB312 – power supply wiring kit
• WCB311 – 14-pin I/O Cable (included)
• WCB313 – 3-pin QCL Power Cable (included)
• WCB314 – 4-pin QCL Load Cable (included)
• QCL TEST LOAD – resistive test load for setting up and
configuring the driver
PREVENT DAMAGE FROM ELECTROSTATIC
DISCHARGE
Before proceeding, it is critical that you take precautions to
prevent electrostatic discharge (ESD) damage to the driver
and your laser. ESD damage can result from improper
handling of sensitive electronics, and is easily preventable
with simple precautions.
Enter the search phrase “ESD Precautions for Handling
Electronics” in an internet search engine to find information
on ESD-safe handling practices.
We recommend that you always observe ESD precautions
when handing the QCL driver and your QCL.
THERMAL MOUNTING CONSIDERATIONS
The QCL driver is equipped with internal over-temperature
protection circuitry. The FAULT LED on the front panel will
illuminate, and the output will switch off if the protection
circuitry detects an internal over-temperature condition.
To prevent over-temperature faults, the QCL driver should
be mounted so that the heatsink receives adequate airflow.
If the driver is installed in a case, the enclosure must be
ventilated.
SAFE OPERATING AREA—DO NOT EXCEED
INTERNAL POWER DISSIPATION LIMITS
The QCL driver is equipped with a heatsink that is
sufficient for most operating environments. In high current
applications, or when operating temperatures are elevated,
forced airflow over the heatsink may be required.
Refer to the online SOA calculator to determine whether or
not a fan will be necessary in your application.
!
© 2016
It is imperative that you verify the unit will
operate within the internal heat dissipation
Safe Operating Area (SOA).
Operating the driver outside the SOA may
damage or destroy the driver and/or laser.
www.teamWavelength.com
8
QCL OEM SERIES LOW-NOISE DRIVER
WIRE THE POWER SUPPLIES
Wire the QCL driver to the dual power supplies as shown in
Figure 4. If you are using the PWRPAK-24V power supplies
from Wavelength, we recommend you also use the wiring
kits WCB312 and WCB313.
Connect to AC Mains; refer to power supply
specifications for input voltage requirements.
Twisted Pair 1
POSITIVE SUPPLY
+V
-V
NEGATIVE SUPPLY
FG AC(L) AC(N)
+V
Ground Interconnect
2
V- (Pin J4-2)
FG AC(L) AC(N)
Ground Wire1
1
Neg-to-Pos Interconnect 1
V+ (Pin J4-3)
-V
This resistor provides a lossy connection from system
ground to earth ground, and will prevent the ground
potential of isolated power supplies from drifting. NOTE:
Some systems can have problematic ground loops. If this
occurs, you may want to try and optically isolate the remote
POWER and ENABLE lines. It is not a requirement for low
noise operation, but it can be an option. (See Table 4 for
the remote Switch Settings.)
NOTE: For remote operation the front panel Power and
Enable switches must be on.
If you are unsure whether to include this resistor in your
system, contact Wavelength Electronics for technical
assistance.
Chassis
Ground
2
CONNECT THE TEST LOAD
150kΩ
Ground
2
(Pin J4-1)
Figure 4 indicates a 150 kΩ resistor connecting the
power supplies to ground; this resistor is necessary if the
electronics ground is tied to earth ground at some point
within your system, such as at a DAQ card, computer, or
USB cable connection.
Earth
Ground
1. Cable included as part of the WCB312 Power Supply Wiring Kit
2. Included with the QCL Driver.
Figure 4. QCL Power Supply Wiring
Follow these instructions to wire the power supplies using
the WCB312 and WCB313. The same method applies to
connect other power supplies to the QCL driver.
• The AC Line (black) and Neutral (white) wires: 24 AWG
black and white wires, 10” with ring lugs unattached but
included in kit: connect the AC Line wire to the AC(L)
terminals and the Neutral wire to the AC (N) terminals,
as shown in Figure 4.
It is very important to configure the QCL driver using a
test load rather than the actual quantum cascade laser.
Refer to page 2 for test load specifications and wiring
instructions. Connect the test load now.
SET THE CURRENT LIMIT
The QCL driver employs a soft-clamping current limit. The
limit circuit begins to act at a current below the absolute
limit setpoint, and will prevent the output current from ever
exceeding the absolute limit setpoint.
We recommend that setpoint is below 85% of the
current limit, because the noise level introduced into
the QCL rises when operating close to the current limit.
• AC Safety Ground #1: 24 AWG green wire, 10” with
ring lugs on each end; connect to the Frame Ground
terminals on the power supplies.
First, zero the SET and LIMIT currents by turning the
trimpots counter-clockwise; 21 turns for the SET trimpot
and 12 turns for the LIMIT trimpot.
• AC Safety Ground #2: 24 AWG green wire; 10” with one
ring lug; connect to the Frame Ground terminal on one
power supply; connect the other end to Earth Ground
(usually through the equipment rack, chassis, or optical
bench).
Next switch on the power supplies, then switch on the
QCL driver by setting the POWER switch to ON (right); the
blue POWER LED on the front panel will illuminate. Do not
enable the output at this time.
• Common Ground: 24 AWG black wire; 10” with ring lugs
on each end; connect between V– of Positive Supply
and V+ of Negative Supply.
The current limit is set using the LIMIT trimpot on the front
panel:
• Refer to the datasheet for your QCL to find the maximum
current, then calculate the Current Limit Monitor voltage,
referencing Table 3 for the transfer function:
VI_LIM_MON = ILIMIT / Transfer Function
• Use the remaining ring lugs to connect the power
supply cable (WCB313) to the V+, Power Ground, and
V– terminals of the power supplies. See page 20 for
information on the WCB313 cable.
© 2016
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9
QCL OEM SERIES LOW-NOISE DRIVER
• Connect the voltmeter to the Current Limit Monitor,
pins J1:4 (positive) and J1:3 (negative/gnd).
Once the driver is configured, disable the output then switch
off the driver. Finally, switch off the power supplies.
• Adjust the LIMIT trimpot until the Current Limit Monitor
voltage matches the calculated VLIMIT value.
CONFIGURE THE +5V AUX JUMPER
The procedure detailed here results in a practical current
limit that is somewhat below the limit calculated using the
transfer function. To set the current limit more accurately,
refer to page 15.
ADJUST THE OUTPUT CURRENT
USING THE SETPOINT MONITOR
The DC current setpoint is set by adjusting the SET trimpot
on the front panel:
• Refer to the datasheet for your QCL to find the operating
current, then calculate the Current Setpoint Monitor
voltage using this equation and referencing Table 3 on
page 4 for the transfer function:
VSET_MON = (IOUT / Transfer Function) – 0.080 (V)
• Connect the voltmeter to the Current Setpoint Monitor,
pins J1:6 (positive) and J1:3 (negative/gnd).
• Adjust the SET trimpot until the VSET_MON value on the
voltmeter matches the calculated VSET_‌MON value.
• The SET_MON voltage is offset from the OUT_MON
voltage by approximately 80 mV. To improve output
setpoint accuracy, follow the procedure outlined in the
next section.
The QCL driver can be configured to provide a 5 VDC output
on pin J5:1.
Changing the configuration requires opening the QCL
driver case: In an ESD-safe environment, remove the eight
Phillips screws located around the perimeter of the base of
the unit; there are two screws on each side. Next remove
the baseplate; the fit is intentionally tight and it will take
some effort to remove the baseplate.
Refer to Figure 5 on page 11 for the jumper location.
Removing the jumper pin disables the +5V AUX output;
placing the jumper over both pins of the header connects
pin J5:1 to the +5V AUX supply. Pin J5:2 is Ground and
is always connected to ground, regardless of the jumper
position.
When the QCL driver is delivered, the +5 AUX output is
Disabled.
Avoid driving noisy external circuits with the +5V AUX
output; the external circuit may impact the QCL driver
output noise level if adequate precautions are not taken to
filter electronic noise.
ADJUST THE OUTPUT CURRENT
USING THE CURRENT OUTPUT MONITOR
The DC current setpoint is set by adjusting the SET trimpot
on the front panel:
• Refer to the datasheet for your QCL to find the operating
current, then calculate the Current Output Monitor
voltage using this equation and referencing Table 3 on
page 4 for the transfer function:
VOUT_MON = IOUT / Transfer Function (V)
• Connect the voltmeter to the Current Output Monitor,
pins J1:5 (positive) and J1:3 (negative/gnd).
• Switch on the driver output usng the ENABLE switch.
• Adjust the SET trimpot until the VOUT_MON value on the
voltmeter matches the calculated VOUT_MON value.
• To further protect the QCL, the current limit can be
decreased to just above the setpoint value by adjusting
the LIMIT trimpot until the voltage just begins to
decrease. Then increase the limit until the voltmeter
reads the correct VOUT_MON value again.
© 2016
www.teamWavelength.com
10
QCL OEM SERIES LOW-NOISE DRIVER
The factory default configuration is with onboard Power and
Enable switches active, and the remote signals are inactive.
NOTE: For remote operation the front panel Power and
Enable switches must be on.
The QCL driver case must be opened in order to access the
switches. The DIP switches are located on the bottom of the
circuit board, as illustrated in Figure 5.
LOCAL / REMOTE SWITCHES
+5V AUX JUMPER
Table 4. Local vs. Remote Switch Settings
SWITCH
ON OFF
1 2 3 4
CONFIGURE LOCAL VS. REMOTE CONTROL
PWRPWR+
ENEN+
LOCAL ↔ REMOTE
Note: NO.
ON (LEFT)
OFF (RIGHT)
4
Remote Signal Tied
to Driver Ground
Remote Signal
Optically Isolated
3
Local Power Switch
Remote Power
Signal
2
Remote Signal Tied
to Driver Ground
Remote Signal
Optically Isolated
1
Local Output
Enable Switch
Remote Output
Enable Signal
If Switch 1 is ON, Switch 2 must also be ON
If Switch 3 is ON ,Switch 4 must also be ON
Once the switches are configured reassemble the chassis
and tighten the screws.
PWRPWR+
ENEN+
LOCAL ↔ REMOTE
COMPLETE ADDITIONAL WIRING
If the remote power and enable functions of the QCL driver
are being used, connect them to the control electronics.
Also connect external electronics for status monitoring.
Refer to Table 1 for specifications on each connection.
ANALOG SETPOINT INPUT
Figure 5. Bottom View of QCL Driver Showing the
Internal Remote / Local Switches and +5V AUX Jumper
Table 4 details the switch settings for Local vs. Remote
control. The Remote input signals can be optically isolated,
or they can be tied to the instrument ground. Choosing
whether or not to isolate the remote Power and Enable
functions depends on the control system configuration:
• Isolate the inputs when using a computer or DAQ card
to generate the control signals. Computers and DAQ
cards are typically very noisy, and optically isolating
these inputs will prevent that noise from conducting to
the QCL driver and laser.
• Isolating the remote inputs requires two I/O lines per
function, one for the signal and one for the return. If
there is not a sufficient number of I/O lines on the DAQ
card, the functions can’t be isolated.
• If the ground potential resistor is installed, see the
wiring diagram in Figure 4.
© 2016
The external analog setpoint signal sums with the onboard
SET trimpot. To calculate the analog input signal voltage,
reference Table 3 for the transfer function, and use the
following equation:
VANALOG = ISETPOINT / Transfer Function
The VANALOG signal can be -5 V to +5 V.
If the analog setpoint input causes the driver to reach
the current limit, the output signal will be clamped at the
limit level but will not switch off. Refer to page 15 for
information on current limit circuit response to modulated
analog setpoint input signals.
The bandwidth of the Current Monitor is lower than the
bandwidth of the output. To monitor the actual output
waveform at high frequencies, connect an oscilloscope
across the output pin J5:4 (positive) and J5:3 (negative‌/‌gnd)
while using the resistor test load.
!
www.teamWavelength.com
Connect the oscilloscope across the test
load only—never connect the oscilloscope
across a quantum cascade laser.
11
QCL OEM SERIES LOW-NOISE DRIVER
CONNECT THE QUANTUM CASCADE LASER
Once you are comfortable with operating the QCL driver,
disable the output, switch off all power to the driver,
disconnect the test load, and connect the laser. Refer to
Figure 6 for proper wiring polarity.
Note that the Positive Terminal of the QC Laser is connected
to ground, and the Negative Terminal is connected to the
Driver. The QCL driver acts as a current sink.
Pin J5-4
QCL +
Pin J5-3
QCL -
RECOVER FROM AN INTERNAL
OVER-TEMPERATURE FAULT
The QCL driver is equipped with a protection circuit to switch
off the output if the internal temperature exceeds a safe
operating value. If an over-temperature fault is detected the
FAULT LED will illuminate red, and the signal on J1‌:7 will
go HI. Switch off the output using the onboard switch or
the remote output enable signal. The QCL will not allow the
output to be enabled until the internal temperature is within
the safe operating range.
QCL
QCL Driver
Current Sink
-V
Figure 6. QCL Wiring and Polarity
ENABLE THE QCL DRIVER OUTPUT
Enable the output current by setting the ENABLE switch to
ON (right). The blue ENABLE LED on the front panel will
illuminate. The output is disabled by setting the switch to
the OFF position (left).
RECOVER FROM A POWER SUPPLY
PROTECTION CIRCUIT FAULT
If the voltage from the dual power supplies is over or under
voltage limits, the protection circuit will disable the output
and latch the driver in a FAULT state. If a fault is indicated,
switch off the QCL driver and power supplies.
After correcting the cause of the power supply error, the
driver must be reset. Toggle the Power OFF then ON using
either the remote signal or front panel switch. After switching
on the power, wait one second to re-enable current.
If supply voltage to the QCL driver is reversed, protection
circuits activate and the current from the power supplies
is shunted through a protection diode. The internal fuses
may blow, and the QCL driver will not operate under
this condition. Switch off all power, correct the error, and
re‑enable the driver.
© 2016
www.teamWavelength.com
12
QCL OEM SERIES LOW-NOISE DRIVER
TROUBLESHOOTING
PROBLEM
Driver will not switch on
Output will not enable
Noise current is higher than
expected
POTENTIAL CAUSES
SOLUTIONS
Improperly configured power
supplies
Carefully check the wiring diagram in Figure 2 on page 2. Make sure
the power supply polarity is not reversed. The FAULT LED will illuminate
red if the driver is switched on with reversed power supply polarity.
Internal fuses are blown
In an ESD-safe environment, open the QCL driver chassis and verify the
fuses are not blown. Replace the fuses if necessary. Refer to page 15.
Improperly configured Remote
switches on the QCL unit
Make sure that the Remote switches in the QCL driver are set to the
correct position for your application. Refer to Configure Local vs. Remote
Control on page 11.
Remote Enable signal is not
correct
If the driver is configured to reference the Remote inputs, make sure the
signals are correct. Disconnect the remote input lines and check them
independently of the driver. Refer to Table 1 on page 3.
The QCL driver detected a power
supply fault
If the red FAULT LED is illuminated, the protection circuitry has detected a
fault condition on the power supply inputs. Refer to Recover from a Power
Supply Protection Circuit Fault on page 12.
The QCL driver detected an overtemperature condition
If the red FAULT LED is illuminated and the signal on J1:7 is HI, the
protection circuitry has detected an over-temperature fault condition. Refer
to page 12.
There may be ground loops
in the system; some system
components may be higher
noise than expected; cabling and
shielding may be inadequate
Refer to Wavelength Electronics Application Note AN-LD08: “Manage
Grounding to Minimize Noise with the QCL Drivers”:
http://www.teamwavelength.com/downloads/notes/an-ld08.pdf
Also reference AN-LD09: “Troubleshooting Low Noise Systems”:
http://www.teamwavelength.com/downloads/notes/an-ld09.pdf
Switching power supplies may
be noisy
Use the best quality switching power supplies you can find. We test our
QCL drivers using our stock PWRPAK-24V power supplies.
The QCL driver detected a power
supply fault
If the red FAULT LED is illuminated the protection circuitry has detected a
fault condition on the power supply inputs. Refer to Recover from a Power
Supply Protection Circuit Fault on page 12.
The QCL driver detected an overtemperature condition
If the red FAULT LED is illuminated and the signal on J1:7 is HI, the
protection circuitry has detected an over-temperature fault condition.
Laser output power lower
than expected
Current limit set too low
Using a test load (see Figure 3 on page 2) follow the procedure to set
the current limit (page 9). Verify that the current limit is suitable for your
laser by connecting the voltmeter across RLOAD; calculate the drive current
using Ohm’s Law (V = I * R).
20 kHz noise is in the output
current
QCL driver is operating in current
limit
If safe for the quantum cascade laser, increase the output current limit
setting. When actively operating in current limit, the safety circuits add
noise to the output.
If I run my QCL at about
5% of maximum output
current, the transfer function
becomes non-linear and I
see distortion in my output
current waveform.
QCL driver resolution is too low
Select a QCL driver with a much lower maximum output current. For
example, to run 50 mA, request a QCL125 (125 mA maximum output).
The output switched off
unexpectedly
© 2016
www.teamWavelength.com
13
QCL OEM SERIES LOW-NOISE DRIVER
TECHNICAL SUPPORT
INFORMATION
QCL OEM REV A – C TRANSFER FUNCTIONS
The transfer functions for production revisions A – C are
shown in Table 5 and Table 6.
This section includes useful technical information on these
topics:
• Revision A – C Wiring Diagram
• Revision A – C Transfer Functions
• Replace the Internal Fuses
• Soft-Clamp Current Limit
• Square Wave Response
• Drive LEDs With the Status Outputs
• Product Variations
• Optimizing the System for Low Noise
• Safe Operating Area Calculation
Table 5. Current Limit Monitor and Setpoint Transfer
Functions—Revisions A – B
MODEL
CURRENT
OUTPUT
MONITOR
CURRENT
LIMIT
MONITOR
ANALOG
INPUT
QCL500
0.2 A / V
0.09 A / V
0.1 A / V
QCL1000
0.4 A / V
0.19 A / V
0.2 A / V
QCL1500
0.6 A / V
0.28 A / V
0.3 A / V
QCL2000
0.8 A / V
0.39 A / V
0.4 A / V
Table 6. Current Limit Monitor and Setpoint Transfer
Functions—Revision C
MODEL
CURRENT
OUTPUT
MONITOR
CURRENT
LIMIT
MONITOR
ANALOG
INPUT
QCL OEM REVISION A – C WIRING DIAGRAM
QCL500
0.1 A / V
0.09 A / V
0.1 A / V
QCL1000
0.2 A / V
0.19 A / V
0.2 A / V
Refer to Figure 7 for information on wiring earlier revisions
of the QCL driver.
QCL1500
0.3 A / V
0.28 A / V
0.3 A / V
QCL2000
0.4 A / V
0.39 A / V
0.4 A / V
TTL Optional Remote Power On
HI = On; Low = Disabled
TTL Optional Remote Enable
HI = Enabled; Low = Disabled
DVM
-
Optional Analog Setpoint
(-5 V to +5 V)
+
V+
_
+
_
+
V−
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
No Connect
No Connect
Remote Power On – 1
Remote Power On +
Remote Enable – 1
Remote Enable +
QCL Enable Status
Power Status
Overtemp Fault Status
Current Monitor
Limit Monitor
Monitor Ground
Analog In
Analog In GND
Ground
V+
V–
Power Ground
QCL+ (Ground)
QCL–
QCL
ANALOG
SMA
2
2
QCL
SMA
POWER
1. The Remote Power On − and Remote Enable − inputs can be optically isolated from ground.
2. The SMA connectors are electrically isolated from the QCL chassis.
Figure 7. Revision A – C Wiring Diagram
© 2016
www.teamWavelength.com
14
QCL OEM SERIES LOW-NOISE DRIVER
REPLACE THE INTERNAL FUSES
SOFT-CLAMP CURRENT LIMIT
The QCL driver is equipped with two internal fuses. If the
QCL driver will not power on and you have verified that the
power supplies are wired and working properly, check and
replace these two fuses. See Figure 8 for the fuse location.
The fuses are 5 A, 5 x 20 mm, SLO-BLO fuses.
The QCL driver employs a soft-clamping current limit that
begins to act at a current lower than the calculated absolute
current limit. We recommend that setpoint is below 85% of
the current limit, because the noise level introduced into the
QCL rises when operating close to the current limit.
In an ESD-safe environment, remove the eight Phillips
screws around the base of the unit. Then remove the
baseplate—the fit is intentionally tight and will require some
effort.
Normally, the LIM_MON voltage is calculated using the
transfer function shown in Table 3. Using the transfer
function to set the LIM_MON voltage sets the absolute
current limit, which is the current that will not be exceeded
under any circumstance.
Because of the soft-clamp circuit, the actual current where
the limit circuit begins to act is offset from the calculated
absolute current limit. The Limit Offset Current is calculated
as follows, where XLIM‌_‌MON is the current limit transfer function
for the QCL driver model you are using (see Table 3):
Limit Offset Current = XLIM_MON * (VLIM_MON – 0.4) (A)
PWRPWR+
ENEN+
LOCAL ↔ REMOTE
If the output current is between the Limit Offset Current
and the Absolute Current Limit, the output response to the
analog input setpoint is nonlinear. The result is that the drive
current will asymptotically approach the absolute current
limit, and will never exceed it even if the analog input
setpoint voltage far exceeds the current limit voltage.
Figure 8. Location of Internal Fuses
Replace the fuses, then reinstall the chassis cover and
tighten the eight screws.
Figure 9 illustrates the behavior of the soft-clamp current
limit. In this case the analog input voltage setpoint signal is
a triangle wave, with the amplitude set so that the driver will
attempt to overdrive the current limit.
Figure 9. Soft Clamping Current Limit Behavior
© 2016
www.teamWavelength.com
15
QCL OEM SERIES LOW-NOISE DRIVER
SQUARE WAVE RESPONSE
PRODUCT VARIATIONS
Figure 10 and Figure 11 illustrate the modulation response
of the QCL1000 driven at 1.15 A into a 10 Ω test load.
We design and manufacture our products in-house, and
that gives us the unique ability to modify our drivers and
controllers to suit exactly your application. Our Product
Variation service allows us to quickly and cost-effectively
address your design requests, from prototype quantities to
long-term high-volume manufacturing.
Figure 10. 10 kHz Output Plot
QCL1000 at 1.15 A with 10 Ω Test Load
Examples of Product Variations include:
• Increase the compliance voltage limit with PV055-C:
compliance voltage can be increased to 20 V, and
requires power supply inputs of +24 V and –30 V.
• Replace current limit trimpots with fixed-value resistors
to maximize stability in an OEM laser controller.
• Optimize heatsink size and configuration to fit within the
space constraints of your electronics chassis.
• Increase the maximum output current.
• Lower the controller input voltage with PV066-A: power
supply input voltage of ±15 V results in an output
compliance voltage of 7 V. Other input voltage ranges
can be accommodated, as well.
Contact Sales for information on how a Product Variation
can be applied in your situation.
REVERSE POLARITY UNIT AVAILABLE
Often, with epi-down configurations of a QCL, the exit lead
is attached to the case and it is desirable to ground it. Now,
the reverse polarity driver, a current source, is also available
in the OEM package.
The difference is shown in Figure 13 below.
QCLSTANDARDQCL(+)
Pin J5-4
QCL +
QCL
DRIVE LEDS WITH THE STATUS OUTPUTS
In the ON state the Status pins output a 12 V signal,
sourcing up to 25 mA, and can be used to drive indicator
LEDs. Assuming VF = 2 V and a drive current requirement
of 10 mA, LEDs can be connected per Figure 12. Adjust the
resistor value to match the current and voltage requirements
of the LED.
Status Output
(Pin J1:7, 8, or 9)
Ground
(Pin J1:3)
Pin J5-3
QCL+
Pin J5-3
QCL -
QCL
QCL Driver
Current Sink
Pin J5-4
QCL-
1 kΩ, 1/4 W
-V
GND
Figure 13. Polarity Comparison
LED
Figure 12. Wiring Status LEDs
© 2016
V+
QCL(+) Driver
Current Source
Figure 11. 600 kHz Output Plot
QCL1000 at 1.15 A with 10 Ω Test Load
More detailed information is available in the
QCL OEM(+) Series datasheet.
www.teamWavelength.com
16
QCL OEM SERIES LOW-NOISE DRIVER
Grounded Chassis, Linear Power Supply
OPTIMIZING THE SYSTEM FOR LOW NOISE
Wavelength Electronics provides a number of resources on
our website that will help you understand noise sources and
how to eliminate them. Visit this link:
https://www.teamwavelength.com/support/reference.php
One of the most important components affecting noise
performance is the power supply used to power the QCL
driver. Wavelength has extensively tested the TDK/‌Lambda
switching power supply, and recommends this power
supply for most QCL applications (available as our part
number PWRPAK‑24V, two required per driver).
Proper grounding technique is also critical. Always ensure
there are no ground loops within the system. Grounding the
chassis of the QCL driver will help reduce 50/60 Hz noise.
Noise Current Density (nA / √Hz)
The QCL driver is designed to deliver extremely low noise
drive current to the quantum cascade laser, but other factors
must also be considered for optimum system performance.
10
10
10
2
0
2
Noise Current Density (nA / √Hz)
60 Hz Noise
10
0
10
1
10
2
10
3
Frequency (Hz)
10
4
10
5
10
6
Grounded Chassis, Switching Power Supply
Noise Current Density (nA / √Hz)
Floating Chassis, Linear Power Supply
10
10
Figure 15. Noise Plot with Grounded Chassis and Linear
Power Supplies
10
Figure 14 through Figure 16 illustrate the benefits of using
high-quality switching power supplies and grounding the
chassis.
60 Hz Noise
1
10
2
1
60 Hz Noise
1
10
0
10
0
10
1
10
2
10
3
Frequency (Hz)
10
4
10
5
10
6
Figure 16. Noise Plot with Grounded Chassis and High
Quality Switching Power Supplies
10
0
10
0
10
1
10
2
10
3
Frequency (Hz)
10
4
10
5
10
6
Figure 14. Noise Plot with Floating Chassis and
Linear Power Supplies
Leaving the chassis ungrounded and using a low-quality
linear power supply introduces a very strong 60 Hz noise
signature on the output. In most applications this strong
60 Hz signature will negatively impact QCL performance,
so it is critical to ground the chassis to achieve the best
system performance.
© 2016
Additional recommendations to minimize noise:
• Use high quality power supplies, and test the power
supplies independent of the laser driver system in order
to ensure they are performing at a level that will not
introduce unacceptable noise.
• Use filters on the power supplies; off-the-shelf EMI filters
such as the TDK/Lambda MAW Series will provide a
noticeable benefit.
• Use low-noise analog input signal generators. Even
“low noise” function generators have a significant
noise signature that may negatively impact system
performance.
• If a fan is required to help keep the driver cool, do not
wire the fan to the same power supplies used to power
the driver. Fans are notoriously noisy.
• Use the shortest possible power, control, and laser
leads. Use twisted pairs, shielded cables, and shielded
connectors.
www.teamWavelength.com
17
QCL OEM SERIES LOW-NOISE DRIVER
SAFE OPERATING AREA CALCULATION
QCL500 SAFE OPERATING AREA
The Safe Operating Area of the QCL is determined by the
amount of power that can be dissipated within the output
stage of driver. If that power limit is exceeded permanent
damage can result.
The QCL500 will safely operate over the full drive current
range at 25ºC, and no additional airflow is required over the
heatsink. For operating temperatures above 25ºC, refer to
the online SOA calculator.
Do not operate the QCL driver outside of
the Safe Operating Area curve.
Depending on the results of the SOA calculation, the
QCL1000, QCL1500, and QCL2000 may require airflow
over the heatsink in order to safely operate.
Operating the QCL Driver outside of the
SOA voids the warranty.
Refer to the Wavelength Electronics website for the most
up-to-date SOA calculator for our products. The online tool
is fast and easy to use, and also takes into consideration
operating temperature.
http://www.teamwavelength.com/support/calculator/soa/soald.php
SOA charts are included in this datasheet for quick
reference. We recommend you use the online tools instead.
1.0
Airflow Required
0.8
Current (A)
!
0.0
0
5
10
15
20
25
Voltage Drop (|V–| - VQCL)
Figure 17. QCL1000 SOA Chart, at 25ºC
Unsafe
1.5
Current (A)
1.2
Airflow Required
0.9
0.6
0.3
0
0
5
10
15
20
25
Voltage Drop (|V–| - VQCL)
If the SOA calculator indicates the QCL will be outside of the
Safe Operating Area, the system must be changed so that
less power is dissipated within the driver. See Wavelength
Electronics Application Note AN-LDTC01: The Principle of
the Safe Operating Area for information on shifting the Load
Line.
Figure 18. QCL1500 SOA Chart, at 25ºC
2
Unsafe
1.6
Current (A)
After changing any of the parameters, recalculate the
SOA to make sure the controller will operate safely. If you
have questions, or run into difficulties calculating the SOA,
contact Wavelength Electronics for assistance.
0.4
0.2
Follow these steps to determine if the driver will be operating
within the SOA.
• Refer to the QCL laser datasheet to find the maximum
voltage (VQCL) and current (IMAX) specifications.
• Calculate the voltage drop across the controller:
VDROP = |V-| - VQCL (V- is the negative power supply
voltage)
• Mark VDROP on the X-axis, and extend a line upward.
• Mark IMAX on the Y-axis, and extend a line to the right
until it intersects the VDROP line.
• On the X-axis, mark the value of the negative supply
voltage.
• Extend a diagonal line from V- to the intersection of the
other two lines; this is the Load Line.
• If the Load Line crosses the Safe Operating Area line at
any point, the configuration is not safe.
0.6
Airflow Required
1.2
0.8
0.4
0
0
5
10
15
Voltage Drop (|V–| - VQCL)
20
25
Figure 19. QCL2000 SOA Chart, at 25ºC
© 2016
www.teamWavelength.com
18
QCL OEM SERIES LOW-NOISE DRIVER
CABLE SPECIFICATIONS
WCB311 — 14-PIN I/O CABLE; ONE INCLUDED WITH QCL OEM DRIVER
RED
BLK
Analog In GND 1
Analog In 2
Monitor Ground 3
LIM_MON 4
OUT_MON 5
SET_MON 6
Overtemp Status 7
Power Status 8
Enable Status 9
Remote Enable + 10
Remote Enable – 11
Optional connections for Analog In Setpoint
POSITION 1 OPEN
POSITION 2 OPEN
BLK
RED
BRN
WHT
ORN
GRN
BLU
RED
GRN
Remote Power On + 12
Remote Power On – 13
Reserved - Do Not Connect 14
WHT
BLK
POSITION 14 OPEN
14-pin MOLEX
50-57-9414
Overall Cable Length 18”
STRIP 5.00" OF
PVC JACKET
TYP, THIS END
WCB312 — POWER SUPPLY WIRING KIT
24” Long Twisted Pair, 14 AWG
2 Sets Provided Per WCB312 Kit
Black for Line, White for Neutral
Power Supply Ground Interconnect, 10”, 14 AWG
Negative-to-Positive Interconnect, 10”, 24 AWG
Power Supply Ground Wire, 10”, 24 AWG
The WCB312 Power Supply Wiring Kit includes the wires illustrated above, and also includes crimp-type ring lugs:
• (6) blue lugs for 14 AWG wire
• (3) red lugs for 24 AWG wire.
If using the PWRPAK-24 power supplies available from Wavelength, connect the cables as shown in Figure 4 on page
9. If different power supplies are used, the connection and wiring principles are the same.
• The AC Line (black) and Neutral (white) wires: 24 AWG black and white wires, 10” with ring lugs unattached but included
in kit: connect the AC Line wire to the AC(L) terminals and the Neutral wire to the AC (N) terminals, as shown in Figure
4 on page 9
• AC Safety Ground #1: 24 AWG green wire, 10” with ring lugs on each end; connect to the Frame Ground terminals on
the power supplies.
• AC Safety Ground #2: 24 AWG green wire; 10” with one ring lug; connect to the Frame Ground terminal on one power
supply; connect the other end to Earth Ground (usually through the equipment rack, chassis, or optical bench).
• Common Ground: 24 AWG black wire; 10” with ring lugs on each end; connect between V– of the Positive Supply and
V+ of the Negative Supply.
• Use the remaining ring lugs to connect the wires from WCB313 to the V+, V–, and Power Ground terminals of the power
supplies. The wires on the WCB313 are pins 3, 2, and 1, respectively.
© 2016
www.teamWavelength.com
19
QCL OEM SERIES LOW-NOISE DRIVER
WCB313 — 3-PIN QCL POWER CABLE; ONE INCLUDED WITH QCL OEM DRIVER
PGND
V–
V+
BLK
1
2
3
WHT
RED
Overall Cable Length 18”
3-pin MOLEX
SDA-43645-0300
STRIP 5.00" OF
PVC JACKET
TYP, THIS END
WCB314 — 4-PIN QCL LOAD CABLE; ONE INCLUDED WITH QCL OEM DRIVER
GRN
WHT
+5V AUX
GND, Low Current
QCL–
QCL+
1
2
3
4
POSITION 1 OPEN
POSITION 2 OPEN
RED
BLK
4-pin MOLEX
SDA-43645-0400
© 2016
Optional connections for +5V AUX output
Overall Cable Length 18”
www.teamWavelength.com
STRIP 5.00" OF
PVC JACKET
TYPE, THIS END
20
QCL OEM SERIES LOW-NOISE DRIVER
MECHANICAL SPECIFICATIONS - PWRPAK-24V POWER SUPPLY
(10.1)
VOLTAGE ADJUSTMENT
SEE NOTE C
LED
5-M3.5
82±1
FG
(67.5)
FG
-V
7.3
-V
68±0.5
+V
+V
8.4
L
AC(L)
8
(17)
N
AC(N)
(14)
(10)
62±0.5
8
80±1
19MAX
31.5±1
NAME PLATE
SEE NOTE A
SEE NOTE B
HWS15 - 5 /A
INPUT : 100-240VAC 0.5 A
50 / 60Hz
OUTPUT : 5 V 3 A
NAME PLATE
17
BARCODE
15
5
45JB
IND.CONT.EQ.
MADE IN JAPAN
HWS15 - 5 /A
INPUT : 100-240VA 0.5 A 50/60Hz
OUTPUT : 5 V 3 A
INPUT : 100-240VA 0.5 A 50/60Hz
OUTPUT : 5 V 3 A
(5)
67±0.5
8
(5.5)
5
HWS15 - 5 /A
NOTES
A : MODEL NAME, INPUT VOLTAGE RANGE, NOMINAL
OUTPUT VOLTAGE, MAXIMUM OUTPUT CURRENT AND
COUNTRY OF MANUFACTURE ARE SHOWN HERE IN
ACCORDANCE WITH THE SPECIFICATIONS.
B : M3 EMBOSSED, TAPPED AND COUNTERSUNK HOLES (2)
FOR CUSTOMER CHASSIS MOUNTING. SCREWS MUST NOT
PROTRUDE INTO POWER SUPPLY BY MORE THAN 6m/m.
C : M3 TAPPED HOLES (2) FOR CUSTOMER CHASSIS MOUNTING.
SCREWS MUST NOT PROTRUDE INTO POWER SUPPLY BY
MORE THAN 6m/m.
(unit : mm)
MODEL
HWS15/A
A224-02-01/A-A
Figure 20. Power Supply Mechanical Specifications
Diagram courtesy TDK-Lambda.
Specifications subject to change.
© 2016
www.teamWavelength.com
21
QCL OEM SERIES LOW-NOISE DRIVER
MECHANICAL SPECIFICATIONS
6.274
.25
127
5.00
166.370
6.55
152.400
6.00
140.818
5.54
55.378
2.18
35.738
1.41
14.996
.59
15.011
.59
18.250
.72
58.712
2.31
18.974
.75
101.600
4.00
3.569
R.14
58.712
2.31
139.700
5.50
Figure 21. QCL OEM Driver Mechanical Dimensions
The QCL OEM Driver must be firmly secured by the baseplate mounting tabs, and not supported by the cable connectors.
Use either 1/4-20 screws for mounting (4 places), or #8 screws with a shoulder washer (4 places).
All Dims in [mm] inches; Tolerance ±5%
© 2016
www.teamWavelength.com
22
QCL OEM SERIES LOW-NOISE DRIVER
CERTIFICATION AND WARRANTY
CERTIFICATION
Wavelength Electronics, Inc. (Wavelength) certifies that this
product met its published specifications at the time of shipment.
Wavelength further certifies that its calibration measurements are
traceable to the United States National Institute of Standards and
Technology, to the extent allowed by that organization’s calibration
facilities, and to the calibration facilities of other International
Standards Organization members.
SAFETY
There are two fuses within the chassis that are user-serviceable.
There are no other user-serviceable parts inside this product.
Return the product to Wavelength Electronics for service and
repair to ensure that safety features are maintained.
LIFE SUPPORT POLICY
This important safety information applies to all Wavelength
electrical and electronic products and accessories:
For warranty service or repair, this product must be returned to the
factory. An RMA is required for products returned to Wavelength
for warranty service. The Buyer shall prepay shipping charges to
Wavelength and Wavelength shall pay shipping charges to return
the product to the Buyer upon determination of defective materials
or workmanship. However, the Buyer shall pay all shipping
charges, duties, and taxes for products returned to Wavelength
from another country.
As a general policy, Wavelength Electronics, Inc. does not
recommend the use of any of its products in life support
applications where the failure or malfunction of the Wavelength
product can be reasonably expected to cause failure of the life
support device or to significantly affect its safety or effectiveness.
Wavelength will not knowingly sell its products for use in such
applications unless it receives written assurances satisfactory
to Wavelength that the risks of injury or damage have been
minimized, the customer assumes all such risks, and there is no
product liability for Wavelength. Examples of devices considered
to be life support devices are neonatal oxygen analyzers, nerve
stimulators (for any use), auto-transfusion devices, blood pumps,
defibrillators, arrhythmia detectors and alarms, pacemakers,
hemodialysis systems, peritoneal dialysis systems, ventilators of
all types, and infusion pumps as well as other devices designated
as “critical” by the FDA. The above are representative examples
only and are not intended to be conclusive or exclusive of any
other life support device.
LIMITATIONS OF WARRANTY
PATENTED TECHNOLOGY
The warranty shall not apply to defects resulting from improper
use or misuse of the product or operation outside published
specifications. No other warranty is expressed or implied.
Wavelength specifically disclaims the implied warranties of
merchantability and fitness for a particular purpose.
Covered by U.S. Patents 6,696,887; 6,867,644; and 7,176,755.
Licensed from Battelle Memorial Institute.
WARRANTY
This Wavelength product is warranted against defects in materials
and workmanship for a period of one (1) year from date of shipment.
During the warranty period, Wavelength will, at its option, either
repair or replace products which prove to be defective.
WARRANTY SERVICE
EXCLUSIVE REMEDIES
The remedies provided herein are the Buyer’s sole and exclusive
remedies. Wavelength shall not be liable for any direct, indirect,
special, incidental, or consequential damages, whether based on
contract, tort, or any other legal theory.
REVERSE ENGINEERING PROHIBITED
REVISION HISTORY
DOCUMENT NUMBER: QCL1500-00400
REV.
DATE
CHANGE
P
August 2015
Clarified instructions for remote
operation
Q
January 2016
Added reference to QCL OEM(+)
R
May 2016
Included PV information in max
power supply section
S
May 2017
Updated Analog Input settings.
Buyer, End-User, or Third-Party Reseller are expressly prohibited
from reverse engineering, decompiling, or disassembling this
product.
NOTICE
The information contained in this document is subject to change
without notice. Wavelength will not be liable for errors contained
herein or for incidental or consequential damages in connection
with the furnishing, performance, or use of this material. No part of
this document may be translated to another language without the
prior written consent of Wavelength.
© 2016
WAVELEnGTH
ELECTRONICS
www.teamWavelength.com
51 Evergreen Drive
Bozeman, Montana 59771
406-587-4910 (tel)
406-587-4911 (fax)
Sales & Tech Support
sales@teamWavelength.com
techsupport@teamWavelength.com
23
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