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

SA08

SA08U

1

SA08

FEATURES

•IGBTOUTPUTS

•WIDESUPPLYRANGE—16-450V

•20ATO100°CCASE

•3PROTECTIONCIRCUITS

•SYNCHRONIZEDOREXTERNALOSCILLATOR

•FLEXIBLEFREQUENCYCONTROL

APPLICATIONS

•MOTORS

•REACTIVELOADS

•MAGNETICBEARINGS

•LARGEPIEZOELEMENTS

•OFF-LINEDRIVERS

•C-DWELDCONTROLLER

DESCRIPTION

The SA08 is a pulse width modulation amplifier that can

supply 9KW to the load. An internal oscillator requires no

external components. The clock input stage divides the oscil-

lator frequency by two, which provides the switching frequency

of 22.5 kHz. The oscillator may also be used 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 supply or ground in addition

to load shorts. The H-bridge output IGBTs 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

MOTORTORQUECONTROL

EXTERNALCONNECTIONS

TOP

VIEW

CLK IN

CLK OUT

+PWM

FLAG

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.

*See text. As +PWM goes more positive, A OUT duty cycle

increases.

A OUT

B OUT

ILIM/SHDN

I SENSE A

I SENSE B

RSENSE

RSENSE

MOTOR

GND

CLK IN

CONTROL

SIGNAL

CLK OUT

FLAG

+PWM

Vcc

5V

5V

SHUTDOWN

CONTROL

OUTPUT

DRIVERS

PWM

45K

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 Amplifiers

SA08

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 − SA08UREVF