SA303 datasheet(1/14 Pages) CIRRUS

Part #	SA303

Description	3 Phase Switching Amplifier

PDF	14 Pages

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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SA303

SA303U

P r o d u c t I n n o v a t i o n F r o m

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.

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

3 Phase Switching Amplifier

SA303

P r o d u c t I n n o v a t i o n F r o m

FIgURE.BLOCKDIAgRAm

http://www.cirrus.com

mAY2009

APEX − SA303UREVA

SA303 Switching Amplifier

Vs (phase A)

PG ND(A&B)

Gate

Control

PWM

Signals

A

B

C

O ut A

O ut B

O ut C

PG ND(C)

TEM P

GND

Vs (phase B&C)

V

S +

I

LIM/D IS 1

SC

DIS2

SG ND

Phase A

Phase C

Phase B

Control

Logic

V

DD

Ia'

Ib'

Ic'

Ia'

Ib'

Ic'

Fault

Logic

Ia

Ic

Ib

At

Ab

Bt

Bb

Ct

Cb

V

DD

V

DD

V

DD

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