PA94
High Voltage Power Operational Amplifiers
FEATURES
•
•
•
•
High Voltage— 900V (±450V)
High Slew Rate — 500V/µs
Output Current— 100mA
Programmable Current Limit
COMPLIANT
RoHS
APPLICATIONS
•
•
•
•
High Voltage Instrumentation
Programmable Power Supplies up to ±430V
Mass Spectrometers
Semiconductor Measurement Equipment
DESCRIPTION
The PA94 is a high voltage, MOSFET operational amplifier designed as a low cost solution for driving con‐
tinuous output currents up to 100mA and pulse currents up to 200mA into capacitive loads. The safe operat‐
ing area (SOA) has no second breakdown limitations and can be observed for all load types 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 uses a minimum of board space allowing for high density circuit boards. The Power SIP is
electrically isolated. Isolating thermal washers (TW13) prevent arcing from pins to heatsink.
Figure 1: Equivalent Schematic
12
+VS
R1A
R1B
C2
R3
Q3
Q1
Q6
Q5
Q15A
1
–IN R9
R11
2
+IN
Q29
–VS
10
R20
Q2
6
4
R4
Q4
CC2
Q8
Q11
R7
CC1
Q15B
R10
R12
ILIM
8
Q29
Q21
7
OUT
R19
Q30
R27
Q14
www.apexanalog.com
© Apex Microtechnology Inc.
All rights reserved
Sep 2017
PA94U Rev Q
PA94
TYPICAL CONNECTION
Figure 2: Typical Connection
R
F
100 k
+V
S
C
10
10μF
C
9
100nF
R
IN
+V
S
C
C
10pF
C
C
+
1k
V
OUT
C
C
CL
PA94
-V
S
R
CL
-V
S
C
8
10μF
C
7
100nF
R
L
2
PA94U Rev Q
PA94
PINOUT AND DESCRIPTION TABLE
Figure 3: External Connections
Pin Number
1
2
4, 6
7
8
10
12
Name
‐IN
+IN
CC
OUT
CL
‐Vs
+Vs
Description
The inverting input.
The non‐inverting input.
Compensation capacitor connection. Select value based on Phase Compensation.
See applicable section.
The output. Connect this pin to load and to the feedback resistors.
Connect to the current limit resistor. Output current flows into/out of this pin
through R
CL
. The output pin and the load are connected to the other side of R
CL
.
The negative supply rail.
The positive supply rail.
PA94U Rev Q
3
PA94
SPECIFICATIONS
Unless otherwise noted: T
C
= 25°C, DC input specifications are ± value given. Power supply voltage is typical
rating. C
C
= 4.7pF.
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage, total
Output Current, source, sink, peak, within SOA
Power Dissipation, continuous @ T
C
= 25°C
Input Voltage, differential
Input Voltage, common mode
1
Temperature, pin solder, 10s max.
Temperature, junction
2
Temperature Range, storage
Operating Temperature Range, case
T
C
T
J
‐55
‐40
Symbol
+V
s
to ‐V
s
I
O
P
D
V
IN (Diff)
V
cm
Min
Max
900
200
30
Units
V
mA
W
V
V
°C
°C
°C
°C
‐20
‐V
S
+20
+V
S
260
150
+125
+85
1. Although supply voltages can range up to ± 450V the input pins cannot swing over this range. The input pins must be at
least 30V from either supply rail but not more than 450V from either supply rail. See text for a more complete descrip‐
tion of the common mode voltage range.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dis‐
sipation to achieve high MTTF.
CAUTION
The PA94 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 toxic fumes.
4
PA94U Rev Q
PA94
INPUT
Parameter
Offset Voltage, initial
Offset Voltage vs. Temperature
Offset Voltage vs. Supply
Offset Voltage vs. Time
Bias Current, initial
Bias Current vs. Supply
Offset Current, initial
Input Impedance, DC
Input Capacitance
Common Mode Voltage Range
1
Common Mode Rejection, DC
Noise
V
S
= ±450V
V
CM
= ±90V
10 kHz bandwidth, R
IN
= 1 kΩ
±V
S
∓
30
80
98
2
Full temp range
Test Conditions
Min
Typ
0.5
15
10
75
200
4
50
10
11
4
Max
5
50
25
2000
500
Units
mV
µV/°C
µV/V
µV/kh
pA
pA/V
pA
Ω
pF
V
dB
µV RMS
1. Although supply voltages can range up to ± 450V the input pins cannot swing over this range. The input pins must be at
least 30V from either supply rail but not more than 450V from either supply rail. See text for a more complete descrip‐
tion of the common mode voltage range.
GAIN
Parameter
Open Loop @ 15 Hz
Power Bandwidth
Phase Margin, A
V
= 100
Test Conditions
R
L
= 5 kΩ
R
L
= 5 kΩ
Full temp range
Min
94
Typ
115
140
300
60
Max
Units
dB
MHz
kHz
°
Gain Bandwidth Product @ 1 MHz R
L
= 5 kΩ
OUTPUT
Parameter
Voltage Swing
Current, continuous
Slew Rate, A
V
= 100
Settling Time, to 0.1%
Resistance
C
C
=2.2pF
2V Step
no load
Test Conditions
I
O
= 70mA
Min
±V
S
∓
24
100
500
Typ
±V
S
∓
20
700
1
100
Max
Units
V
mA
V/µs
µs
Ω
PA94U Rev Q
5
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