PA90 - Apex Microtechnology

PA90 - Apex Microtechnology
PA90
High Voltage Power Operational Amplifiers
RoHS
COMPLIANT
FEATURES
•
•
•
•
•
High Voltage — 400V (±200V)
Low Quiescent Current — 10mA
High Output Current — 200mA
Programmable Current Limit
High Slew Rate — 300V/µs
APPLICATIONS
•
•
•
•
Piezoelectric Positioning
High Voltage Instrumentation
Electrostatic Transducers
Programmable Power Supplies up to 390V
DESCRIPTION
The PA90 is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost
solution for driving continuous output currents up to 200mA and pulse currents up to 350mA. The safe oper‐
ating area (SOA) has no second breakdown limitations and can be observed for all type loads by choosing an
appropriate current limiting resistor. The MOSFET output stage is biased AB for linear operation. External
compensation provides flexibility in choosing bandwidth and slew rate for the application. Apex Microtech‐
nology’s Power SIP package uses a minimum of board space allowing for high density circuit boards. The 12‐
pin Power SIP is electrically isolated.
TYPICAL CONNECTIONS
Figure 1: Typical Connection
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Aug 2015
PA90U Rev P
PA90
PINOUT AND DESCRIPTION TABLE
Figure 2: External Connections
Pin Number
2
Name
Description
1
‐IN
The inverting input.
2
+IN
The non‐inverting input.
3
IQ
Quiescent current reduction pin. Connect to pin 5 to disable the AB bias. See appli‐
cable section.
4
RC
Compensation resistor connection. Select value based on Phase Compensation.
See applicable section.
5
CC
Compensation capacitor connection. Select value based on Phase Compensation.
See applicable section.
6
OUT
The output. Connect this pin to load and to the feedback resistors.
7, 8
‐Vs
The negative supply rail. Pins 7 and 8 are not internally connected and must be
shorted.
9, 10
CL
Connect to the current limit resistor. Output current flows into/out of these pins
through RCL. The output pins and the load are connected to the other side of RCL.
Pins 9 and 10 are internally connected.
11, 12
+Vs
The positive supply rail. Pins 11 and 12 are internally connected.
PA90U Rev P
PA90
SPECIFICATIONS
All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typi‐
cal performance characteristics and specifications are derived from measurements taken at typical supply
voltages and TC = 25°C.
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Max
Units
+Vs to ‐Vs
400
V
Output Current, source, sink, peak, within SOA
IO
350
mA
Power Dissipation, continuous @ Tc = 25°C
PD
30
W
Supply Voltage, +Vs to ‐Vs
Input Voltage, differential
Input Voltage, common mode
Min
VIN (Diff)
‐20
+20
V
Vcm
‐VS
+VS
V
260
°C
150
°C
‐55
125
°C
‐40
85
°C
Temperature, pin solder, 10s max.
Temperature, junction
1
TJ
Temperature Range, storage
TC
Operating Temperature Range, case
1. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation
to achieve high MTTF.
The PA90 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to tempera‐
tures in excess of 850°C to avoid generating toxic fumes.
CAUTION
INPUT
Parameter
Test Conditions
Min
Offset Voltage, initial
Offset Voltage vs. Temperature
Full temp range
Typ
Max
Units
0.5
2
mV
15
50
µV/°C
Offset Voltage vs. Supply
10
25
µV/V
Offset Voltage vs. Time
75
Bias Current, initial
200
µV/kh
2000
pA
Bias Current vs. Supply
4
Offset Current, initial
50
Input Impedance, DC
1011
Ω
4
pF
Input Capacitance
±VS ∓ 15
Common Mode Voltage Range 1
Common Mode Rejection, DC
VCM = ±90V
Noise
100 kHz bandwidth, RS = 1 kΩ,
CC = OPEN
80
pA/V
500
pA
V
98
dB
1
µV RMS
1. +VS and –VS denote the positive and negative power supply rail respectively.
PA90U Rev P
3
PA90
GAIN
Parameter
Min
Typ
94
111
dB
Gain Bandwidth Product @ 1MHz RL = 2 kΩ, CC = Open
RL = 2 kΩ, CC = Open
Power Bandwidth
100
MHz
470
kHz
Phase Margin
60
°
Open Loop @ 15Hz
Test Conditions
RL = 2 kΩ, CC = Open
Full temp range
Max
Units
OUTPUT
Parameter
Voltage Swing1
Test Conditions
IO = 200mA
Current, continuous
Min
Typ
±VS ∓ 12
±VS ∓ 10
Max
V
200
Slew Rate, A V = 100
CC = Open
240
Capacitive Load, A V = +1
Full temp range
470
Settling Time to 0.1%
CC = Open, 2V step
Resistance, no load
Units
mA
300
V/µs
pF
1
µs
50
Ω
1. +VS and –VS denote the positive and negative power supply rail respectively.
POWER SUPPLY
Parameter
Test Conditions
Voltage 1
Min
Typ
Max
Units
±40
±150
±200
V
10
14
mA
Max
Units
Current, quiescent
1. Derate max supply rating 0.625 V/°C below 25°C case. No derating needed above 25°C case.
THERMAL
Parameter
Test Conditions
Min
Typ
Resistance, AC, junction to case 1
Full temp range, F > 60 Hz
2.5
°C/W
Resistance, DC, junction to case
Full temp range, F < 60 Hz
4.2
°C/W
Resistance, junction to air
Full temp range
Temperature Range, case
Meets full range specifica‐
tions
30
‐25
°C/W
+85
°C
1. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz.
4
PA90U Rev P
PA90
TYPICAL PERFORMANCE GRAPHS
Figure 3: Power Derating
Figure 4: Normalized Quiescent Current
1.3
Normalized Quiescent Current, IQ (X)
/ŶƚĞƌŶĂůWŽǁĞƌŝƐƐŝƉĂƟŽŶ͕W;tͿ
40
32
24
16
8
0
0
25
50
75
100
125
1.2
1.1
1.0
25
150
50
75
100
125
Case Temperature, TC (°C)
Case Temperature, TC (°C)
Figure 5: Small Signal Response
Figure 6: Phase Response
50
90
135
30
Phase, ɭ (°)
Open Loop Gain, A (dB)
40
20
10
0
CC = 68 pF
CC = 10 pF
CC = 4.7 pF
CC = Open
-10
100k
225
1M
Frequency, F (Hz)
PA90U Rev P
180
10M
270
100k
CC = 68 pF
CC = 10 pF
CC = 4.7 pF
CC = OPEN
1M
10M
Frequency, F (Hz)
5
PA90
Figure 7: Output Voltage Swing
Figure 8: Power Response
400
300
0.1
0.15
0.2
80
70
60
50
10k
100k
1M
Frequency, F (Hz)
Output Current, Io (A)
Figure 9: Slew Rate
Figure 10: Harmonic Distortion
1k
700
500
1
RLсϭŬɏ
VS = 200V
AV = 63
300
200
ŝƐƚŽƌƟŽŶ;йͿ
Slew Rate (sͬʅƐ)
N
OPE
0.5
CC=
0
100
F
4.7p
3.5
F
10p
4
CC=
4.5
200
CC=
5
F
68p
Output Voltage, VO (VP-P)
5.5
CC=
Voltage Drop From Supply, VS- VO (V)
6
100
70
50
40
30
.1
PO = 17.6W
PO = 1W
.01
PO = 5W
20
10
.10
.001
1
10
džƚŽŵƉĞŶƐĂƟŽŶĂƉĂĐŝƚŽƌ͕C (pF)
6
100
100
1k
10k
100k
Frequency, F (Hz)
PA90U Rev P
PA90
Figure 11: Input Noise Voltage
Figure 12: Current Limit
0.2
15
Current Limit, I LIM (A)
Input Noise Voltage, V (;Ŷsя,nj)
20
10
7
5
0.15
0.1
0.05
3
2
10
100
1k
10k
100k
Frequency, F (Hz)
0
0
4
8
12
16
20
24
Resistor Value, RCL (ɏ)
Figure 13: Power Supply Rejection
120
100
-V
S
ѐVout(mV)
80
+V
S
60
40
20
0
1
10
100
1k
10k
100k
Frequency, F (Hz)
PA90U Rev P
7
PA90
SAFE OPERATING AREA (SOA)
The safe operating area curves define the maximum additional internal power dissipation the amplifier
can tolerate when it produces the necessary output to drive an external load.
The MOSFET output stage of this power operational amplifier has two distinct limitations:
1. The current handling capability of the MOSFET geometry and the wire bonds.
2. The junction temperature of the output MOSFETs.
Note: The output stage is protected against transient flyback. However, for protection against sustained,
high energy flyback, external fast‐recovery diodes should be used.
Figure 14: SOA
KƵƚƉƵƚƵƌƌĞŶƚ&ƌŽŵнVS ŽƌͲVS ;ŵA)
500
ϮϬ
300
Ϭŵ
ϭϬ
Ϭŵ
^
200
^
͕d
100
͕d
50
C
͕d
C
C
=2
5°
=8
C
5°
=1
C
25
°C
30
20
10
25
50
75 100 125
250
500
^ƵƉƉůLJƚŽKƵƚƉƵƚŝīĞƌĞŶƟĂů͕VS -VO (V)
8
PA90U Rev P
PA90
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.apexana‐
log.com for Apex Microtechnology’s complete Application Notes library, Technical Seminar Workbook, and
Evaluation Kits.
TYPICAL APPLICATION
Low Power, Piezoelectric Positioning
Piezo positioning may be applied to the focusing of segmented mirror systems. The composite mirror
may be composed of hundreds of elements, each requiring focusing under computer control. In such com‐
plex systems the PA90 reduces the costs of power supplies and cooling with its advantages of low cost and
low quiescent power consumption while increasing circuit density with the SIP.
Figure 15: Typical Application
PHASE COMPENSATION
Gain
CC*
RC
≥1
68pF
100 Ω
≥5
10pF
100 Ω
≥10
4.7pF
0Ω
≥30
NONE
0Ω
*CC To be rated for the full supply voltage +VS to –VS. Use NPO ceramic (COG) type.
PA90U Rev P
9
PA90
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be connected as shown in the typical connec‐
tion diagram. For optimum reliability the resistor value should be set as high as possible. The value is calcu‐
lated as follows; with the maximum practical value of 32 ohms.
0.65V
R CL    = ------------------I LIM  A 
INPUT PROTECTION
Although the PA90 can withstand differential voltages up to ±20V, additional external protection is rec‐
ommended. Low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1‐Q4
in Figure 16). The differential input voltage will be clamped to ±1.4V. This is sufficient overdrive to produce
maximum power bandwidth.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. See
Figure 16. The zeners clamp transients to voltages within the power supply rating and also clamp power sup‐
ply 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 reversals as well as line regu‐
lation.
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 transzorbs prevent this, and it is desirable that they be both electrically and physically
as close to the amplifier as possible.
Figure 16: Overvoltage Protection
STABILITY
The PA90 is externally compensated and performance can be tailored to the application. Use the graphs
of small signal response and power response as a guide. The compensation capacitor CC must be rated at
500V working voltage. An NPO capacitor is recommended. The compensation network CCRC must be
mounted closely to the amplifier pins 4 and 5 to avoid spurious oscillation.
10
PA90U Rev P
PA90
QUIESCENT CURRENT REDUCTION
When pin 3 (IQ) is shorted to pin 5 (CC2) the AB biasing of the output stage is disabled. This raises distor‐
tion since the output stage is then class C biased, but reduces the quiescent current by 1mA for a power dissi‐
pation savings of 0.4W. Pin 3 may be left open if not used.
PACKAGE DESIGN
Part Number
Apex Package Style
Description
PA90
DP
12‐Pin SIP
PA90EE
EE
12‐Pin SIP w/ formed leads
PACKAGE STYLE DP
PA90U Rev P
11
PA90
PACKAGE STYLE EE
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.
12
PA90U Rev P
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