8

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

3946

Half-Bridge Power MOSFET Controller

L

P

L

P

VREG

C

BOOT

+VBAT

+5 Vref

Charge

Pump

BOOT

GH

S

GL

LGND

VREG

CP1

CP2

Charge

Pump

RESET

Protection

VREG Undervoltage

Overtemperature

UVLOBOOT

IN2

~FAULT

DT

Control

Logic

Turn-On

Delay

IN1

R

DEAD

15.8 k

Ω

VREF

Bootstrap

UVLO

10

k

Ω

C

REG

C1

0.47 μF

R

GATE

R

GATE

I

LIM

High Side

Driver

Low Side

Driver

C2

10 μF

0.1 uF

VREF

10 μF

IRF2807

IRF2807

0.47 μF

33

Ω

200

k

Ω

33

Ω

External

+5 V

IN

IN

Brake

Forward

M

DC

Motor

PGND

L

P

L

L

L

L

P

P

L

P

Application Block Diagrams

Diagram A. Dependent drivers. Unidirectional motor control with braking and dead time. T