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

SA03

SA03U

1

SA03

SA03

USA

BeO

∆

TE949311

FEATURES

•WIDESUPPLYRANGE—16-100V

•30ACONTINUOUSTO60°Ccase

•3PROTECTIONCIRCUITS

•ANALOGORDIGITALINPUTS

•SYNCHRONIZEDOREXTERNALOSCILLATOR

•FLEXIBLEFREQUENCYCONTROL

APPLICATIONS

•MOTORSTO4HP

•REACTIVELOADS

•LOWFREQUENCYSONAR

•LARGEPIEZOELEMENTS

•OFF-LINEDRIVERS

•C-DWELDCONTROLLER

DESCRIPTION

The SA03 is a pulse width amplifier that can supply 3000W

to the load. An internal 45kHz oscillator requires no external

components. The clock input stage divides the oscillator fre-

quency by two, which provides the basic switching of 22.5 kHz.

External oscillators may also be used to lower the switching

frequency or to synchronize multiple amplifiers.Current sensing

is provided for each half of the bridge giving amplitude and

direction data.A shutdown input turns off all four drivers of the

H bridge output.A high side current limit and the programmable

low side current limit protect the amplifier from shorts to sup-

ply or ground in addition to load shorts. The H bridge output

MOSFETs are protected from thermal overloads by directly

sensing the temperature of the die.The 12-pin hermetic MO-127

power package occupies only 3 square inches of board space.

BLOCKDIAGRAMANDTYPICALAPPLICATION

EXTERNALCONNECTIONS

TOP

VIEW

CLK IN

CLK OUT

+PWM

–PWM/RAMP

GND

ILIM/SHDN

ISENSE A

A OUT

+VS

VCC

*

*

B OUT

I SENSE B

1

2

3

4

5

6

12

11

10

9

8

7

TOP

VIEW

Case tied to pin 5. Allow no current in case. Bypassing of supplies

is required. Package is Apex MO-127 (STD). See Outline

Dimensions/Packages in Apex data book.

If +PWM > RAMP/–PWM then A OUT > B OUT.

* See text.

A OUT

B OUT

ILIM/SHDN

I SENSE A

I SENSE B

RSENSE

RSENSE

MOTOR

GND

CLK IN

CONTROL

SIGNAL

CLK OUT

–PWM/RAMP

+PWM

Vcc

5V

5V

SHUTDOWN

CONTROL

OUTPUT

DRIVERS

PWM

56K

1K

1K

5K

.01µF

470pF

÷2

OSC

CURRENT

LIMIT

9

8

3

10

4

2

1

5

11

12

6

7

12-PINPOWERDIP

PACKAGESTYLECR

Pulse Width Modulation Amplifier

SA03

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 − SA03UREVH