SA57 Datasheet, PDF (1/14 Pages) Cirrus Logic – Switching Amplifier

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SAS5A577
Switching Amplifier
FEATURES
♦ Low cost intelligent switching amplifier
♦ Directly connects to most embedded Micro-
controllers and Digital Signal Controllers
♦ Integrated gate driver logic with dead-time
generation and shoot-through prevention
♦ Wide power supply range (8.5V to 60V)
♦ Over 15A peak output current per phase
♦ 5A continuous output current per phase
8A continuous for A-Grade (SA57A)
♦ Independent current sensing for each output
♦ User programmable cycle-by-cycle current
limit protection
♦ Over-current and over-temperature warning
signals
APPLICATIONS
♦ Bidirectional DC brush motors
♦ 2 unidirectional DC brush motors
♦ 2 independent solenoid actuators
♦ Stepper motors
DESCRIPTION
The SA57 is a fully integrated switching amplifier de-
signed primarily to drive DC brush motors. Two inde-
pendent half bridges provide over 15 amperes peak
output current under microcontroller or DSC control.
Thermal and short circuit monitoring is provided, which
generates fault signals for the microcontroller to take
appropriate action. A block diagram is provided in Fig-
ure 1.
Additionally, cycle-by-cycle current limit offers user
programmable hardware protection independent of the
microcontroller. Output current is measured using an
innovative low loss technique. The SA57 is built using
a multi-technology process allowing CMOS logic con-
trol and complementary DMOS output power devices
on the same IC. Use of P-channel high side FETs en-
ables 60V operation without bootstrap or charge pump
circuitry.
The Power Quad surface mount package balances ex-
cellent thermal performance with the advantages of a
low profile surface mount package.
SC
TEMP
I_LIM/D IS 1
I1
I2
D IS 2
1t
1b
PWM
Signals
2t
2b
SGND
Figure 1. BLOCK Diagram
V_S +
V_DD
Vs 1
V_DD
Fault
I1'
Logic
I2'
Vs 2
V_DD
Control
Logic
Gate
Control
Phase 1
Phase 2
I1'
I2'
Out 1
Out 2
SA57 Switching Amplifier
PGND 1
GND
PGND 2
SA57U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
OCT 2008
APEX − SA57UREVA