SA57

8

SA57U

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

2.SA57OPERATION

The SA57 is designed primarily to drive DC brush motors. However, it can be used for any application requiring two

high current outputs. The signal set of the SA57 is designed specifically to interface with a DSP or microcontroller. A

typical system block diagram is shown in the figure below. Over-temperature, Short-Circuit and Current Limit fault

signals provide important feedback to the system controller which can safely disable the output drivers in the pres-

ence of a fault condition. High side current monitors for both phases provide performance information which can

be used to regulate or limit torque.

FIgURE4.SYSTEmDIAgRAm

SA57 Switching Amplifier

DC BRUSH

MOTOR

Vs 1

PGND 1

Current

monitor

Signals

1

2

OUT 1

OUT 2

PGND 2

GND

Vs 2

Vs +

GND

SGND

Gate

Control

Control

Logic

Fault

Logic

TEM P

I

SC

I1

I2

V

DD

PWM

Signals

DIS2

SG ND

1t

1b

2t

2b

M icrocontroller

or DSC