11

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

3946

Half-Bridge Power MOSFET Controller

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

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

M

DC

Motor

PGND

Forward

Reverse

CAUTION: Shoot-

Through Possible

VREF

P

L

P

L

P

L

L

L

L

P

P

L

P

Diagram D. Dependent drivers with independent controls. Unidirectional, motor control with brake/coast,

but without dead time control.