SA57A
SAS5A75A7A
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
♦ 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 SA57A 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 SA57A is built
using a multi-technology process allowing CMOS logic
control and complementary DMOS output power de-
vices on the same IC. Use of P-channel high side FETs
enables 60V operation without bootstrap or charge
pump circuitry.
The HSOP surface mount package balances excellent
thermal performance with the advantages of a low pro-
file surface mount package.
SC
TEMP
ILIM/D IS 1
I1
I2
D IS 2
PWM
Signals
1t
1b
2t
2b
SGND
FIGURE 1. BLOCK DIAGRAM
VS +
VDD
V S1
Fault
Logic
I1'
I2'
VDD
VS 2
VDD
Control
Logic
Gate
Control
Phase 1
Phase 2
I1' I2'
Out 1
Out 2
SA57A Switching Amplifier
PGND 1
GND
PGND 2
SwAw5w7.Uapexanalog.com
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
SA5O7CUTR2E0V1F21
