3935

THREE-PHASE POWER

MOSFET CONTROLLER

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

2

Functional Block Diagram

Copyright © 2003 Allegro MicroSystems, Inc.

See pages 8 and 9 for terminal assignments and descriptions.

VREG

High-Side

Driver

Low-Side

Driver

Turn ON

Delay

CA

GHA

SA

GLA

LSS

CSN

To Phase B

C

BOOT

To Phase C

Turn ON

Delay

R

S

VBOOST

VBAT

Control

Logic

CSP

BOOSTS

BOOSTD

IHA

ILA

IHB

ILB

IHC

ILC

ENABLE

GND

cs

Drain-Source

Fault Monitor

VBAT Overvoltage

VBAT Undervoltage

VREG Undervoltage

Short to Ground

Short to Battery

Bridge Open

VDD Undervoltage

Thermal Shutdown

VDSTH

SA

SB

SC

CSOUT

VDRAIN

Low Drop

Out

Linear

Regulator

VREG

REFi

REFv

LSS

VDRAIN

(KELVIN)

FAULT

Motor

Supply

Voltage

UVFLT

OVFLT

OVSET

VDD

PhaseA

VBAT

VIGN

VBAT

VREG

VDD

VDD

External +5V

OS

(blank)

OS

(off)

Dwg. FP-053