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

1

FEATURES

• LOW BIAS CURRENT — FET Input

• PROTECTED OUTPUT STAGE — Thermal Shutoff

• EXCELLENT LINEARITY — Class A/B Output

• WIDE SUPPLY RANGE — ±12V TO ±50V

• HIGH OUTPUT CURRENT — ±5A Peak

APPLICATIONS

• MOTOR, VALVE AND ACTUATOR CONTROL

• MAGNETIC DEFLECTION CIRCUITS UP TO 4A

• POWER TRANSDUCERS UP TO 100kHz

• TEMPERATURE CONTROL UP TO 180W

• PROGRAMMABLE POWER SUPPLIES UP TO 90V

• AUDIO AMPLIFIERS UP TO 60W RMS

DESCRIPTION

The PA07 is a high voltage, high output current operational

amplifier designed to drive resistive, inductive and capacitive

loads. For optimum linearity, especially at low levels, the out-

put stage is biased for class A/B operation using a thermistor

compensated base-emitter voltage multiplier circuit. A thermal

shutoff circuit protects against overheating and minimizes

heatsink requirements for abnormal operating conditions. The

safe operating area (SOA) can be observed for all operating

conditions by selection of user programmable current limiting

resistors. Both amplifiers are internally compensated for all

gain settings. For continuous operation under load, a heatsink

of proper rating is recommended.

This hybrid circuit utilizes thick film (cermet) resistors, ceramic

capacitors and semiconductor chips to maximize reliability,

minimize size and give top performance. Ultrasonically bonded

aluminumwiresprovidereliableinterconnectionsatalloperating

temperatures. The 8-pin TO-3 package is hermetically sealed

and electrically isolated. The use of compressible washers

and/or improper mounting torque will void the product warranty.

Please see “General Operating Considerations”.

EQUIVALENT SCHEMATIC

���

����

���

���

����

���

���

���

�

�

��������

������

�

�

�

�

�

�

�

�

TYPICAL APPLICATION

Negates optoelectronic instabilities

Lead network minimizes overshoot

SEQUENTIAL POSITION CONTROL

Position is sensed by the differentially connected photo

diodes, a method that negates the time and temperature

variations of the optical components. Off center positions

produce an error current which is integrated by the op amp

circuit, driving the system back to center position. A momen-

tary switch contact forces the system out of lock and then the

integrating capacitor holds drive level while both diodes are

in a dark state. When the next index point arrives, the lead

network of C1 and R1 optimize system response by reducing

overshoot. The very low bias current of the PA07 augments

performance of the integrator circuit.

EXTERNAL CONNECTIONS

NOTE: Input offset voltage trim optional. R

�����

����

����

����

����

��

��

���

���

�����

������

���������

����������

����

�

�

�

�

�

�

�

�

�

��

��

��

��

��

��

��

��

����

����

���

���

���

��

��

��

��

��

���

���

���

��

��

���

���

����

����

��������������������������������������������������������������

� � � � � � � � � � � � � � �

��������������������������������������

������������

8-PIN TO-3

PACKAGE STYLE CE