Power Amplifier - Apex Microtechnology

Power Amplifier - Apex Microtechnology
MP106
Power Amplifier
FEATURES
•
•
•
•
•
•
•
Optimized Solution to Drive Dynamic Capacitive Loads
Drive Capability 0-540nF
Short Term Output current >30A (within SOA)
High Internal Power Dissipation of 130W
Fixed Gain -15V/V or -20V/V
Optimized for Achieving a -36V Output Voltage Swing
Slew Rate of 50 V/µs
APPLICATIONS
•
Piezoelectric Actuation for Inkjet Printers
DESCRIPTION
The MP106 is a high output power amplifier for driving capacitive loads such as piezo devices used in inkjet printing applications. The MP106 utilizes Apex proprietary technology with discrete semiconductor and
passive elements on a thermally highly conductive, but electrically isolated package, delivering high power in
a very compact module.
The amplifier gain is fixed at -15V/V or -20V/V. It is optimized to achieve a -36V output voltage swing
even at a small output voltage offset with a single 3V DAC. A combination of internal and external compensation provides optimum slew rate and insures stability while reducing the overall number of required components. Auxiliary voltages (+VB and -VB) for the amplifier stage are used to reduce the power loss in the output
drivers.
Figure 1: Typical Connection
CC
+VB
RC
CBP4
CBP3
Print Nozzle
Command
Voltage
7
5
-IN
4,8
15-18
MP106
OUT
1
23-26
+IN
33, 38, 39
D1
CBP5
CBP2
CBP1
CBP6
VTMP
-VS
-VB
www.apexanalog.com
© Apex Microtechnology Inc.
All rights reserved
Oct 2017
MP106U Rev A
MP106
PINOUT AND DESCRIPTION TABLE
The package of MP106 is designed to be mounted above the print head if desired. Therefore, the width of
the amplifier is less than the width of the Samba print head. Please check the positioning of the connectors
and the location of the components carefully to avoid any damage during mounting or any short to ground.
All pins except those marked TP, N/C, TEMP or GAIN must be connected externally for proper operation. The
diodes between +VS/+VB and -VB/-VS are recommended to prevent damage of the amplifier during power
sequencing.
Figure 2: External Connections
OUT
OUT
OUT
OUT
-VS
-VS
-VS
-VS
TEMP GND
TEMP
CBP3
D1
CBP4
GAIN
D2
CBP5 CBP6
9 10 11 12 13 14 15 16 17 18 19 20
N/C
8
N/C
GND
+VB
RC
CC
7
-VB
CC
6
N/C
GND
5
N/C
BPLT
CBP1 CBP2
4
N/C
TP
3
N/C
GND
2
-VB
+IN
1
-VB
42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21
-IN
+VB
N/C
OUT
OUT
OUT
OUT
+VS
+VS
+VS
+VS
N/C
N/C
Riso
CN
2
RN
MP106U Rev A
MP106
Pin Number
Name
Description
1
TP
Do not connect
2
BPLT
Backplate. Connect to signal ground
3
GND
Signal Ground
4
+VB
Positive amplifier operating voltage (“Boost” voltage)
5
CC
External compensation capacitor. Connect compensation capacitor and resistor in
series between this pin and ground pin.
6
N/C
Not connected
7
GND
Signal Ground
8
+VB
Positive amplifier operating voltage (“Boost” voltage)
9
GAIN
Gain. Connect to pin 7 (GND) for a gain of 20. Leave open for a gain of 15.
10
N/C
Not connected
11,12,13,14
OUT
Amplifier output. Must be connected also to pins 27, 28, 29, 30
15,16,17,18
+VS
Positive supply pins. Connect these pins to power ground.
19,20
N/C
Not connected
21
TEMP
Temperature sensor output
22
TEMP GND
Signal Ground
23,24,25,26
-VS
Negative amplifier output stage supply voltage
27,28,29,30
OUT
Amplifier output. Must be connected also to pins 11, 12, 13, 14
31,32
N/C
Not connected
33
-VB
Negative amplifier operating voltage (“Boost” voltage)
34,35,36,37
N/C
Not connected
38, 39
-VB
Negative amplifier operating voltage (“Boost” voltage)
40
GND
Signal Ground
41
+IN
Non-inverting amplifier input
42
-IN
Inverting amplifier input
SPECIFICATIONS
Unless notes otherwise, the electrical characteristics are based on TC=25°C, +VS=0V, -VS=-48V, +VB=15V, -VB=-60V
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Min
Max
Units
Supply Voltage
-Vs
-60
-15
V
Positive Boost Supply
+VB
+15
V
Negative Boost Supply
-VB
-VS
V
Output Current, peak
Io
32
A
Power Dissipation
PD
130
W
Input Voltage
VIN
+10
V
MP106U Rev A
-VS-15
-0.5
3
MP106
Temperature, pin solder, 10s max
TS
Operating Temperature Range, case
TC
-25
225
°C
+85
°C
AMPLIFIER ELECTRICAL CHARACTERISTICS
Parameter
Test Conditions
Input Voltage, VIN1
Offset Voltage, initial
Offset Voltage vs. Temperature
Full Temp Range
Offset Voltage vs. Supply
Min
Typ
Max
Units
0
0-3
5
V
-7
3
7
mV
7.2
μV/°C
72
μV/V
Bias Current, initial
300
Input Resistance, DC
550
nA
160
MΩ
Input Capacitance
3
pF
Input Noise @ 10 kHz
12
nV/√Hz
1. With │AV│≥15 and the negative supply rail of -40V, a 5V input would drive the amplifier into the rail. The specification
only indicates that an accidental 5V input signal does not cause any harm to the amplifier.
GAIN
Parameter
Test Conditions
Min
Typ
Max
Units
Amplifier Gain, AV,
Pin 9 open
-14.7
-15
-15.3
V/V
Amplifier Gain, AV,
Pin 9 connected to pin 7
-19.7
-20
-20.3
V/V
Open Loop Gain (@15 Hz)
96
dB
Gain Bandwidth Product, 1 MHz
8.5
MHz
Power Bandwidth, 40 p-p
280
kHz
OUTPUT
Parameter1
Test Conditions
Min
Typ
Max
Units
Voltage Swing, +VS
+VB=13V, -VS=-14V, -VB=-27,
lo=10A
Voltage Swing, -VS
+VB=13V, -VS=-14V, -VB=-27,
lo=10A
-VS+2
V
Voltage Swing, -VS
+VB=13V, -VB=-VS=-14V, lO=10A
-VS+5
V
30
A
Current, continuous
+VS-1
10
Current, peak
Slew rate
V
AV=-15, CL=540nF, RL=0.1Ω,
VOUT = 40V pulse
45
A
V/μs
1. -VS and GND are power supply lines that will carry currents of up to 32A peak (540nF load, 50V/µs slew rate). Therefore
proper dimensioning of PCB traces and the power supply itself need to be considered. +VB and –VB are auxiliary supplies
with currents below 1A.
4
MP106U Rev A
MP106
POWER SUPPLY
Parameter1
Test Conditions
Supply Voltage, -Vs
Min
Typ
Max
Units
-60
-48
-15
V
Positive Boost Supply, +VB
15
V
Negative Boost Supply, -VB
-60
V
Quiescent current, +VB Iq
-VS= -48V, -VB= -61V, +VB=
+13V
20
24
28
mA
Quiescent current, -VB Iq
-VS= -48V, -VB= -61V, +VB=
+13V
22
30
36
mA
1. -VS and GND are power supply lines that will carry currents of up to 32A peak (540nF load, 50V/µs slew rate). Therefore
proper dimensioning of PCB traces and the power supply itself need to be considered. +VB and –VB are auxiliary supplies
with currents below 1A.
THERMAL
Parameter
Test Conditions
Min
Typ
Max
Units
Resistance, AC, Junction to Case
0.5
°C/W
Resistance, DC, Junction to Case
2.1
°C/W
Resistance, Junction to Air
13.2
°C/W
85
°C
Temperature Range, Case
0
TEMPERATURE SENSOR
Parameter
Temperature Sensor Output,
VTEMP
Test
Conditions
TC = 25°C
Temperature Sensor Gain
Temperature Accuracy
MP106U Rev A
TC = -40°C to
85°C
MP106
Min
Typ
MP106
Max
Min
Typ
Max
Units
2.98
*
V
10
*
mV/°C
±1
*
°C
5
MP106
TYPICAL PERFORMANCE GRAPHS
Figure 3: Closed Loop Phase vs. Frequency
Figure 4: Closed Loop Gain vs. Frequency
30
-10
25
-60
20
-110
15
-160
Gain, AV (dB)
Phase (0)
40
Av=-20
-210
-260
Av=-15
10
5
0
-5
Av=-15
-310
-10
-360
-15
1
1
10
100
1000
10000
Figure 5: +VB Quiescent Current
1000
10000
35
35
30
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100
Figure 6: -VB Quiescent Current
40
30
25
20
15
10
25
20
15
10
5
5
-65
-55
-45
-35
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6
10
Frequency (kHz)
Frequency (kHz)
0
-75
Av=-20
-25
0
-75
-65
-55
-45
-35
-25
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MP106U Rev A
MP106
Figure 7: Minimum Slew Rate vs. Output
Voltage
Figure 8: -VS Voltage drop when -VS=-VB
6
90
80
5
70
4
VDROP, (V)
Slew Rate (V/us)
60
50
40
Av=-15
30
3
2
20
1
10
0
0
20
25
30
35
40
2
45
4
6
12
14
16 18
Figure 10: Pulse Response for No Load
0
0
-5
-5
-10
-10
Output Voltage (V)
Output Voltage (V)
Figure 9: Pulse Response for 540nF Load
-15
-20
-25
-30
-35
-15
-20
-25
-30
-35
-40
-40
-6
-4
-2
0
Time (us)
MP106U Rev A
10
ILOAD (A)
Output Voltage (V)
-45
-8
8
2
4
6
-45
-8
-6
-4
-2
0
2
4
6
Time (us)
7
MP106
SAFE OPERATING AREA (SOA)
The MOSFET output stage of the MP106 is not limited by second breakdown considerations as in bipolar
output stages. Only thermal considerations and current handling capabilities limit the SOA (see Safe Operating Area graph). The output stage is protected against transient fly back by the parasitic body diodes of the
output stage MOSFET structure. However, for protection against sustained high energy fly back external fast
recovery diodes must be used.
Figure 11: Safe Operating Area (SOA)
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ŵ
Ɛ͕
d
10
d
с
ϴϱ 0
d
с
сϮ
ϱ0
ϴ
ϱ0
1
0.1
1
10
100
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Figure 12: Power Derating
160
WŽǁĞƌ/ƐƐŝƉĂƟŽŶ;tͿ
140
120
100
80
60
40
20
0
-40
-20
0
20
40
60
80
100
Cast Temperature TC (°C)
8
MP106U Rev A
MP106
GENERAL
Please read Application Note 1 “General Operating Considerations” which covers stability, supplies, heat
sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.apexanalog.com for Apex Microtechnology’s complete Application Notes library, Technical Seminar Workbook, and
Evaluation Kits.
POWER SEQUENCING
A diode should be connected between -VS and -VB as shown in typical connections drawing in figure 1 to
avoid damage to the MP106. If diode is not connected, the board should be powered on in the following
sequence:
•
•
•
-VS
-VB
+VB
AMPLIFIER GAIN
The amplifier gain is set to an inverting gain of -15. When the gain pin is shorted to ground (pin 7), the
amplifier gain increases to a gain of -20.
POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminal -VS must be connected physically close to the pins to prevent
local parasitic oscillation in the output stage of the MP106. Use electrolytic capacitors at least 10μF per output
amp required. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R) 0.1μF or greater. A bypass
capacitor of 0.1μF or greater is recommended for the +VB and -VB terminals.
SNUBBER CIRCUIT
When using the amplifier with a capacitive load up to 540nF, an output snubber circuit should be used to
stabilize the output signal of the amplifier. A capacitor value of 22nF and a resistor value of 5Ω are recommended for a snubber circuit.
COMPENSATION
External compensation capacitor Cc and compensation resistor Rc are connected from pin 5 to pin 7 as
shown in typical connection drawing in figure 1. For piezo loads up to 540nF, a compensation of 220pF and
750Ω are recommended.
MP106U Rev A
9
MP106
SERIES ISOLATION RESISTOR, RS
To insure stability with all capacitive loads a series isolation resistor should be included between the output and the load as shown in the external connections drawing. A 0.1Ω resistor works well for capacitive
loads up to 540nF. The resistor will affect the rise and fall time of the output pulse at the capacitive load. This
can be compensated for on the input signal.
BACKPLATE GROUNDING
The substrate of the MP106 is an insulated metal substrate. It is required that it be connected to signal
ground. This is accomplished when the ground pin (Pin 7) is properly connected to signal ground
TEMPERATURE SENSING
The MP106 consists of two IC temperature sensors, located near the two output MOSFETs. The scale factor of the sensor is 10mV/°C. The output voltage of the sensor is equal to approximately 2.98 V at room temperature (Tc = 25°C). The sensor has an uncalibrated temperature error of + 1°C. The scale factor of the sensor
can be adjusted by connecting an optional resistor “R” (refer Fig 13) to TMP pin using the following equation,
where T is case temperature in °C.
Figure 13: Temperature Sensor
Temperature
Sensor IC
VT
10KΩ
To DVM
MP106
Pin 21
R
R
V T = -------------------------  0.01T + 2.73 
10000 + R
10
MP106U Rev A
MP106
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. The
zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to
ground. Whether the zeners are used or not, the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reversal as well as line regulation. Conditions
which can cause open circuits or polarity reversals on either power supply rail should be avoided or protected
against. Reversals or opens on the negative supply rail is known to induce input stage failure. Unidirectional
TVS diodes prevent this, and it is desirable that they be both electrically and physically as close to the amplifier as possible.
MP106U Rev A
11
MP106
PACKAGE OPTIONS
Part Number
Apex Package Style
Description
MP106
FC
42-pin Open Frame
PACKAGE STYLE FC
Note: Shown components and component location for illustration purposes only.
12
MP106U Rev A
MP106
NEED TECHNICAL HELP? CONTACT APEX SUPPORT!
For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For
inquiries via email, please contact [email protected] International customers can also request
support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you,
go to www.apexanalog.com
IMPORTANT NOTICE
Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is
subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right
to make changes without further notice to any specifications or products mentioned herein to improve reliability. This document is the property of
Apex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, mask
work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Apex Microtechnology owns the copyrights associated with the
information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Apex
Microtechnology integrated circuits or other products of Apex Microtechnology. This consent does not extend to other copying such as copying for
general distribution, advertising or promotional purposes, or for creating any work for resale.
APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR LIFE
SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BE
FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK.
Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnology, Inc. All other corporate names noted herein may be
trademarks of their respective holders.
MP106U Rev A
13
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