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

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FEATURES

• WIDE SUPPLY RANGE — ±10 to ±40V

• HIGH OUTPUT CURRENT — ±10A Peak

• CLASS “C” OUTPUT — Low Cost

• LOW QUIESCENT CURRENT — 2.6mA

APPLICATIONS

• DC SERVO AMPLIFIER

• MOTOR/SYNCHRO DRIVER

• VALVE AND ACTUATOR CONTROL

• DC OR AC POWER REGULATOR

DESCRIPTION

The PA51 and PA51A are high voltage, high output current

operational amplifiers designed to drive resistive, inductive

and capacitive loads. Their complementary common emitter

output stage is the simple class C type optimized for low fre-

quency applications where crossover distortion is not critical.

These amplifiers are not recommended for audio, transducer

or deflection coil drive circuits. The safe operating area (SOA)

is fully specified and can be observed for all operating con-

ditions by selection of user programmable current limiting

resistors. Both amplifiers are internally compensated for all

gain settings. For continuous operation under load, mounting

on a heatsink of proper rating is recommended. Do not use

isolation washers!

This hybrid integrated circuit utilizes thick film conductors,

ceramic capacitors and semiconductor chips to maximize reli-

ability, minimize size and give top performance. Ultrasonically

bonded aluminum wires provide reliable interconnections at

all operating temperatures. The 8-pin TO-3 package is electri-

cally isolated and hermetically sealed. The use of compress-

ible thermal washers and/or improper mounting torque will

void the product warranty. Please see “General Operating

Considerations”.

EQUIVALENT SCHEMATIC

TYPICAL APPLICATION

The linear relationship of torque output to current input of

the modern torque motor makes this simple control circuit

ideal for many material processing and testing applications.

The sense resistor develops a feedback voltage proportional

to motor current and the small signal properties of the Power

Op Amp insure accuracy. With this closed loop operation,

temperature induced impedance variations of the motor wind-

ing are automatically compensated.

EXTERNAL CONNECTIONS

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8-PIN TO-3

PACKAGE STYLE CE