Low Cost 5A, 30V Power Amplifier0 pages

PA01 • PA73
PA01 • PA73

PA01, PA73

Power Operational Amplifier
FEATURES
•t LOW COST, ECONOMY MODEL — PA01
•t HIGH OUTPUT CURRENT — Up to ±5A PEAK
•t EXCELLENT LINEARITY — PA01
•t HIGH SUPPLY VOLTAGE — Up to ±30V
•t ISOLATED CASE — 300V

APPLICATIONS

8-PIN TO-3
PACKAGE STYLE CE

•t MOTOR, VALVE AND ACTUATOR CONTROL
•t MAGNETIC DEFLECTION CIRCUITS UP TO 4A
•t POWER TRANSDUCERS UP TO 20kHz
•t TEMPERATURE CONTROL UP TO 180W
•t PROGRAMMABLE POWER SUPPLIES UP TO 48V
•t AUDIO AMPLIFIERS UP TO 50W RMS

TYPICAL APPLICATION
CF

VIN

RIN

.33Ω
3W

0/+5V

DESCRIPTION
The PA01 and PA73 are high voltage, high output current
operational amplifiers designed to drive resistive, inductive
and capacitive loads. For optimum linearity, the PA01 has a
class A/B output stage. The PA73 has a simple class C output
stage (see Note 1) to reduce cost for motor control and other
applications where crossover distortion is not critical and
to provide interchangeability with type 3573 amplifiers. The
safe operating area (SOA) can be observed for all operating
conditions by selection of user programmable current limit
resistors. These amplifiers are internally compensated for all
gain settings. For continuous operation under load, a heatsink
of proper rating is recommended.
This hybrid integrated circuit utilizes thick film (cermet)
resistors, ceramic capacitors and semiconductor 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-3
package is hermetically sealed and electrically isolated. The
use of compressible thermal washers and/or improper mounting torque will void the product warranty. Please see “General
Operating Considerations”
.

PA01

1N4148
RCL–

CL–

8

RCL-

RF

0/–5V

Unidirectional Optical Speed Control

EQUIVALENT SCHEMATIC
3

6

OUT
RCL+

2

CL+

+IN

+VS

Q2B
2

Q3
1

*
Q4 * Q5

8

*

4

Q6A

A1

3

Q2A

*
Q1 *

5 –IN

1

24V

The pulse output of a non-contact optical sensor drives a
voltage-to-frequency converter which generates feedback for
the op amp. With the loop closed in this manner, the op amp
corrects for any variations in the speed due to changing load.
Because of operation in only one direction, an unsymmetrical
supply is used to maximize efficiency of both power op amp
and power supply. High speed diodes at the input protect the
op amp from commutator noise which may be generated by
the motor.

TOP VIEW
OUTPUT

M

UNSYMMETRICAL SUPPLIES FOR EFFICIENCY

–VS

4

OPTO
PULSE
GEN.

F/V

D1 *

7

.33Ω
3W

–30V

EXTERNAL CONNECTIONS
N.C.

RCL+

+6V

Q6B

5
C1
6

NOTE 1:t * Indicates not used in PA73. Open base of Q2A
connected to output of A1.

www.apexanalog.com
PA01-73U

Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)

SEP 2012
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PA01-73U REVY