P r o d u c t I n n o v a t i o n F r o m

PA02 • PA02A

PA02U

1

PA02, PA02A

FEATURES

•HigHpowerbandwidtH—350kHz

•HigHslewrate—20V/µs

•Fastsettlingtime—600ns

•lowcrossoVerdistortion—classa/b

•lowinternallosses—1.2Vat2a

•HigHoutputcurrent—±5apeak

•lowinputbiascurrent—Fetinput

•isolatedcase—300Vdc

applications

•motor,ValVeandactuatorcontrol

•magneticdeFlectioncircuitsupto5a

•powertransducersupto350kHz

•audioampliFiersupto30wrms

description

The PA02 and PA02A are wideband, high output current

operational amplifiers designed to drive resistive, inductive

and capacitive loads. Their complementary “collector output”

stage can swing close to the supply rails and is protected

against inductive kickback. For optimum linearity, the output

stage is biased for class A/B operation. The safe operating

area (SOA) can be observed for all operating conditions by

selection of user programmable, current limiting resistors

(down to 10mA). Both amplifiers are internally compensated

but are not recommended for use as unity gain followers. For

continuous operation under load, mounting on a heatsink of

proper rating is recommended.

These hybrid integrated circuits utilize 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. Iso-

lation washers are not recommended. The use of compress-

ible thermal washers and/or improper mounting torque will

void the product warranty. Please see “General Operating

Considerations”.

eQuiValentscHematic

tYpicalapplication

Vehicular Sound System Power Stage

LOW INTERNAL LOSS MAXIMIZES EFFICIENCY

When system voltages are low and power is at a premium,

the PA02 is a natural choice.The circuit above utilizes not only

the feature of low internal loss of the PA02, but also its very

low distortion level to implement a crystal clear audio amplifier

suitable even for airborne applications. This circuit uses AC

coupling of both the input signal and the gain circuit to render

DC voltage across the speaker insignificant. The resistor and

capacitor across the inputs form a stability enhancement net-

work. The 0.27 ohm current limit resistors provide protection

in the event of an output short circuit.

eXternalconnections

16K

100K

.27Ω

.27Ω

3.2Ω

16W

–12

+12

.47µF

.47µF

16K

.001µF

PA02

IN

1K

RCL+

RCL–

TOP VIEW

1

2

3

4

5

6

7

8

CL–

–VS

+IN

–IN

OUT

OUT

+VS

CL+

2

6

5

7

1

3

4

8

R2

R3

R1

R5

R4

R8

R9

R10

R11

R12

R13

R14

R15

R6

R7

Q1

Q8

Q5

Q4

Q3

Q6

Q2

Q7

A1

D1

D2

8-pinto-3

packagestYlece

Power Operational Amplifiers

PA02 • PA02A

P r o d u c t I n n o v a t i o n F r o m

Copyright © Cirrus Logic, Inc. 2009

(All Rights Reserved)

http://www.cirrus.com

MAY 2009

APEX − PA02UREVO