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SA306A-FHZ

Description
3 Phase Switching Amplifier
File Size817KB,14 Pages
ManufacturerCirrus Logic
Websitehttp://www.cirrus.com
Download Datasheet View All

SA306A-FHZ Overview

3 Phase Switching Amplifier

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SA306
SA306
DESCRIPTION
3 Phase Switching Amplifier
FEATURES
♦ Low cost 3 phase 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 (SA306A)
♦ Independent current sensing for each output
♦ User programmable cycle-by-cycle current
limit protection
♦ Over-current and over-temperature warning
signals
The SA306 is a fully integrated switching amplifier
designed primarily to drive three-phase Brushless
DC (BLDC) motors. Three independent half bridges
provide over 15 amperes peak output current under
microcontroller or DSC control. Thermal and short cir-
cuit monitoring is provided, which generates fault sig-
nals for the microcontroller to take appropriate action.
A block diagram is provided in Figure 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 SA306 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.
APPLICATIONS
♦ 3 phase brushless DC motors
♦ Multiple DC brush motors
♦ 3 independent solenoid actuators
FIgURE . BLOCK DIAgRAm
V
S
+
V
DD
V s (p ha se A )
V s (p ha se B & C )
SC
TEMP
I
LIM
/D IS 1
Ia
Ib
Ic
Fault
Logic
Ia '
Ib '
Ic'
V
DD
V
DD
V
DD
D IS 2
At
Ab
Gate
Control
P ha se A
Ia '
Ib '
Ic'
PWM
Signals
Bt
Bb
Control
Logic
A
P ha se B
B
C
O ut A
O ut B
O ut C
Ct
Cb
SGND
P ha se C
SA306 Switching Amplifier
P G N D (A & B )
GND
P G N D (C )
SA306U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
DEC 2008

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