A3971SLB View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

MFG CO.

A3971SLB

DUAL DMOS FULL-BRIDGE DRIVER

Allegro MicroSystems 

1 2 3 4 5 6 7 8

3971

DUAL DMOS

FULL-BRIDGE DRIVER

LOGIC

SUPPLY

VDD

24

S10 3

S11 10

PWM1 11

S20 22

S21 15

PWM2 23

LGND

2

FUNCTIONAL BLOCK DIAGRAM

0.22 µF/100 V

VOLTAGE

REFERENCE

V REF

LOW SIDE SUPPLY

CP2

13

CP1

12

CHARGE PUMP

UVLO &

THERMAL

SHUTDOWN

DMOS H-BRIDGE

VCP

VCP

14

VBB2

20

0.22 µF

50 V

OUT2A

21

OUT2B

16

BRIDGE 1

CONTROL

LOGIC

BRIDGE 2

CONTROL

LOGIC

GATE

DRIVE

DMOS H-BRIDGE

SENSE2

17

RS, CS

(OPTIONAL)

5

VBB1

OUT1A

4

OUT1B

9

LOAD

SUPPLY

67

GROUND

18 19

SENSE1

8

RS, CS

(OPTIONAL)

Dwg. FP-050

115 Northeast Cutoff, Box 15036

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

Copyright © 2000, Allegro MicroSystems, Inc.

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