POWER OPERATIONAL AMPLIFIER
PA08V
M I C R O T E C H N O L O G Y
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
• EXTENDED SUPPLY RANGE
UP TO
±175V
or
350V TOTAL
• PROVIDES PA08 PERFORMANCE
UP TO
±150mA
PROGRAMMABLE CURRENT LIMIT
LOW DRIFT FET INPUT
APPLICATIONS
• PROGRAMMABLE POWER SUPPLIES UP TO 340V
• ELECTROSTATIC TRANSDUCERS & DEFLECTION
• PIEZO ELECTRIC TRANSDUCERS
• HIGH VOLTAGE INSTRUMENTATION
Please consult the PA08 data sheet for basic information on
this amplifier, plus the application notes in this APEX DATA
BOOK, for recommendations on stability, current limiting,
heatsinks, bypassing, and suggestions for circuit functions.
OUTPUT CURRENT FROM +V
S
OR –V
S
(mA)
SAFE OPERATING AREA CURVE (SOA)
150
100
80
DESCRIPTION
The PA08V is an extended supply range operational ampli-
fier capable of output voltage swings of
±170V
with dual
supplies or 340V total supply voltage on single or non-symmet-
ric supplies.
High accuracy is achieved with a cascode input circuit configu-
ration. All internal biasing is referenced to a zener diode fed by
a FET constant current source. As a result, the PA08 features an
unprecedented supply range and excellent supply rejection. The
output stage is biased class A-B for linear operation. Internal
phase compensation assures stability at all gain settings. The
safe operating area (SOA) can be observed with all types of
loads by choosing the appropriate current limiting resistors. For
operation into inductive loads, two external flyback pulse protec-
tion diodes are recommended. A heatsink may be necessary to
maintain the proper case temperature under normal operating
conditions.
This hybrid integrated circuit utilizes a beryllia (BeO) sub-
strate, thick film resistors, ceramic capacitors, and semicon-
ductor chips to maximize reliability, minimize size and give top
performance. Ultrasonically bonded aluminum wires provide
reliable interconnections at all operating temperatures. The
8-pin to TO-3 package is hermetically sealed and electrically
isolated. The use of compressible thermal isolation washers
and/or improper mounting torque will void the product war-
ranty. Please see “General Operating Considerations”.
t=
t=
t=
20
0µ
s
0.5
50
40
30
20
15
90 100
125
150
t=
1m
s
ms
ste
ad
5m
s
ys
tat
e
175 200
250
300 350
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V)
EQUIVALENT SCHEMATIC
3
7
Q1
Q5
Q2
Q4
C3
Q6
2
Q7
1
C4
5
4
Q12A
Q12B
Q17
Q16
D2
6
Q10
Q11
Q19
8
D1
Q3
C1
SPECIFICATIONS
Specifications of the standard PA08 apply with the benefit of
supply ratings being extended to
±175V.
Design changes
enabling the total supply rating of 350V have no effect on the
shape of the typical performance graphs.
Q8
Q9
C2
GENERAL CONSIDERATIONS
SAFE OPERATING AREA
The extended safe operating area is as follows:
When operating on
±175V,
maximum safe values of capaci-
tive and inductive loading are .2µF and 200mH. Maximum safe
current limit for a short to common is 50mA, and for a short to
supply rails, the maximum is 15mA.
Q15
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA08VU REV. F FEBRUARY 1998 © 1998 Apex Microtechnology Corp.
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