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

1

FEATURES

• LOW THERMAL RESISTANCE — 1.1°C/W

• CURRENT FOLDOVER PROTECTION

• EXCELLENT LINEARITY — Class A/B Output

• WIDE SUPPLY RANGE — ±10V to ±45V

• HIGH OUTPUT CURRENT — Up to ±15A Peak

APPLICATIONS

• MOTOR, VALVE AND ACTUATOR CONTROL

• MAGNETIC DEFLECTION CIRCUITS UP TO 10A

• POWER TRANSDUCERS UP TO 100kHz

• TEMPERATURE CONTROL UP TO 360W

• PROGRAMMABLE POWER SUPPLIES UP TO 90V

• AUDIO AMPLIFIERS UP TO 120W RMS

DESCRIPTION

The PA13 is a state of the art high voltage, very high

output current operational amplifier designed to drive resis-

tive, inductive and capacitive loads. For optimum linearity,

especially at low levels, the output stage is biased for class

A/B operation using a thermistor compensated base-emitter

voltage multiplier circuit. The safe operating area (SOA) can

be observed for all operating conditions by selection of user

programmable current limiting resistors. For continuous opera-

tion under load, a heatsink of proper rating is recommended.

The PA13 is not recommended for gains below –3 (inverting)

or +4 (non-inverting).

This hybrid integrated circuit utilizes thick film (cermet) resis-

tors, ceramic capacitors and semiconductor chips to maximize

reliability, minimize size and give top performance. Ultrasoni-

cally bonded aluminum wires provide reliable interconnections

at all operating temperatures. The 12-pin power SIP package

is electrically isolated.

TYPICAL APPLICATION

POWER RATING

Not all vendors use the same method to rate the power han-

dling capability of a Power Op Amp. APEX rates the internal

dissipation, which is consistent with rating methods used by

transistor manufacturers and gives conservative results. Rating

delivered power is highly application dependent and therefore

can be misleading. For example, the 135W internal dissipation

rating of the PA13 could be expressed as an output rating

of 260W for audio (sine wave) or as 440W if using a single

ended DC load. Please note that all vendors rate maximum

power using an infinite heatsink.

THERMAL STABILITY

APEX has eliminated the tendency of class A/B output

stages toward thermal runaway and thus has vastly increased

amplifier reliability. This feature, not found in most other Power

Op Amps, was pioneered by APEX in 1981 using thermistors

which assure a negative temperature coefficient in the quies-

cent current. The reliability benefits of this added circuitry far

outweigh the slight increase in component count.

EXTERNAL CONNECTIONS

����

�������

���

������������

����

����

����

����

����

����

�

��

�

���

�

����

�

��

�����

�

�

���

�

�

���

�����

��

�����

�

�

���

�

�

��������������������������������

���

����

�

���

���

����

EQUIVALENT SCHEMATIC

�

�

�

�

�

�

�

�

�

��

��

��

���

���

������

����

��

��

�

�

��

�

�

�

�

�

�

��

��

��

��

��

��

��

���

���

���

���

�

��

��

�

�

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

� � � � � � � � � � � � � � �

����������������������������

������������

12-PIN SIP

PACKAGE STYLE DP

Formed leads avaliable

See package styles ED & EE