SA303 Datasheet, PDF (1/14 Pages) Cirrus Logic – 3 Phase Switching Amplifier

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SAS3A03033
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 10A Peak Output Current per Phase
♦ 3A Continuous 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
♦ 3 phase brushless DC motors
♦ Multiple DC brush motors
♦ 3 independent solenoid actuators
DESCRIPTION
The SA303 is a fully integrated switching amplifier
designed primarily to drive three-phase Brushless
DC (BLDC) motors. Three independent half bridges
provide over 10 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 SA303 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}
Ct
Cb
SGND
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}
Phase C
SA303 Switching Amplifier
P G N D (A & B )
GND
P G N D (C )
SA303U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009
APEX − SA303UREVA