APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

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FEATURES

• LOW COST, ECONOMY MODEL — PA01

• HIGH OUTPUT CURRENT — Up to ±5A PEAK

• EXCELLENT LINEARITY — PA01

• HIGH SUPPLY VOLTAGE — Up to ±30V

• ISOLATED CASE — 300V

APPLICATIONS

• MOTOR, VALVE AND ACTUATOR CONTROL

• MAGNETIC DEFLECTION CIRCUITS UP TO 4A

• POWER TRANSDUCERS UP TO 20kHz

• TEMPERATURE CONTROL UP TO 180W

• PROGRAMMABLE POWER SUPPLIES UP TO 48V

• AUDIO AMPLIFIERS UP TO 50W RMS

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 inter-

connections 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 mount-

ing torque will void the product warranty. Please see “General

Operating Considerations”.

EXTERNAL CONNECTIONS

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NOTE 1: * Indicates not used in PA73. Open base of Q2A

connected to output of A1.

TYPICAL APPLICATION

Unidirectional Optical Speed Control

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.

EQUIVALENT SCHEMATIC

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8-PIN TO-3

PACKAGE STYLE CE