PA08V
PA08V
PA08V
Power Operational Amplifiers
FEATURES
• EXTENDED SUPPLY RANGE
UP TO ±175V or
350V TOTAL
• PROVIDES PA08 PERFORMANCE
UP TO ±150mA
PROGRAMMABLE CURRENT LIMIT
LOW DRIFT FET INPUT
8-PIN TO-3
PACKAGE STYLE CE
Please consult the PA08 data sheet for basic information
on this amplifier, plus the application notes in this Apex Mi-
crotechnology Databook, for recommendations on stability,
current limiting, heatsinks, bypassing, and suggestions for
circuit functions.
OUTPUT CURRENT FROM +V
S
OR –V
S
(mA)
APPLICATIONS
• PROGRAMMABLE POWER SUPPLIES UP TO 340V
• ELECTROSTATIC TRANSDUCERS & DEFLECTION
• PIEZO ELECTRIC TRANSDUCERS
• HIGH VOLTAGE INSTRUMENTATION
SAFE OPERATING AREA CURVE (SOA)
t=
DESCRIPTION
The PA08V is an extended supply range operational amplifier
capable of output voltage swings of ±170V with dual supplies or
340V total supply voltage on single or non-symmetric supplies.
High accuracy is achieved with a cascode input circuit con-
figuration. 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 sup-
ply 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 limit-
ing resistors. For operation into inductive loads, two external
flyback pulse protection 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 warranty.
Please see “General Operating Considerations”
.
150
100
80
t=
t=
20
0µ
0.5
s
50
40
30
20
15
90 100
ste
t=
ad
ys
5m
s
e
1m
s
ms
tat
125
150
175 200
250
300 350
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V)
EQUIVALENT SCHEMATIC
3
7
Q1
Q5
Q8
Q9
C4
5
4
Q12A
Q15
D2
6
Q12B
Q16
C2
Q10
Q11
Q2
Q4
C3
Q7
1
Q19
8
Q17
D1
Q3
Q6
2
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.
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.
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PA08VU
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SEP 2012
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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 apex.support@apexanalog.com.
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 informa-
tion, 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 informa-
tion 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 UNDER-
STOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK.
Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnolgy, Inc. All other corporate names noted herein may be trademarks
of their respective holders.
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Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
SEP 2012
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