SA306 Datasheet, PDF (1/14 Pages) Cirrus Logic – 3 Phase Switching Amplifier

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SAS3A03066
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
APPLICATIONS
♦ 3 phase brushless DC motors
♦ Multiple DC brush motors
♦ 3 independent solenoid actuators
DESCRIPTION
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.
SC
TEMP
I_LIM/D IS 1
Ia
Ib
Ic
D IS 2
At
Ab
PWM B t
Signals _{B b}
Figure 1. BLOCK Diagram
V_DD
Vs (phase A)
V_S +
Vs (phase B&C)
Ia'
Fault
Logic
Ib'
Ic'
V_DD
V_DD
V_DD
Gate
Control
Phase A
Control
Logic
Phase B
Ia'
Ib'
Ic'
Out A
A
B
Out B
C ^{Out C}
Ct
Cb
SGND
Phase 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
APEX − SA306UREVB