3933

THREE-PHASE POWER

MOSFET CONTROLLER

www.allegromicro.com

Commutation Truth Table

Logic Inputs

Driver Outputs

H1

H2

H3

DIR

GLA

GLB

GLC

GHA

GHB

GHC

SA

SB

SC

H

L

HH

L

L

HH

L

L

H

Z

L

HL

L

H

L

L

H

L

HL

Z

H

L

H

H

L

H

HL

L

L

HL

LH

Z

LHL

H

HL

L

L

LH

L

Z

H

LH

H

H

LHL

L

LH

Z

L

H

LL

H

H

L

H

L

H

LL

H

L

Z

HLH

L

HL

L

L

LH

L

Z

H

HL

L

L

L

HL

L

L

H

Z

LH

H

H

L

L

L

HL

HL

L

H

L

Z

LHL

L

L

LH

HL

L

H

Z

L

L

H

HL

L

L

HL

H

L

Z

H

L

L

L

H

L

HL

L

L

HL

LH

Z

Input Logic

MODE

PWM

RESET

Mode

Operation

L

L

L

Fast decay

PWM chop mode, current decay

L

H

L

Fast decay

Peak current limit, selected drivers ON

H

L

L

Slow decay

PWM chop mode. current decay

H

H

L

Slow decay

Peak current limit, selected drivers ON

X

X

H

Coast

All gate drive outputs OFF, clear fault logic

Brake Control

BRAKE BRKSEL

Normal Operation

Under Voltage or Power Loss Condition

L

L

Normal run mode

Coast, all gate drive outputs OFF

L

H

Normal run mode

Dynamic brake, all sink gate drives ON

H

L

Dynamic brake, all sink gate drives ON

Coast, all gate drive outputs OFF

H

H

Dynamic brake, all sink gate drives ON

Dynamic brake, all sink gate drives ON

L = Low Level, H = High Level, X = Don’t Care, Z = High Impedance