SA57 Datasheet, PDF (8/14 Pages) Cirrus Logic – Switching Amplifier

SA57
Product Innovation From
2. SA57 OPERATION
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.
Figure 4. System Diagram
SC
TEMP
I_LIM/D IS 1
Current
monitor
I1
Signals ^I2
V_DD
Fault
Logic
Vs 1
Vs +
Vs 2
GND
D IS 2
1t
1b
PWM
Signals
2t
2b
SGND
M icrocontroller
or DSC
Control
Gate
1
Logic
Control
SA57 Switching Amplifier
PGND 1
SGND
DC BRUSH
MOTOR
OUT 1
2
OUT 2
GND
PGND 2

SA57U