3974 查看數據表（PDF） - Allegro MicroSystems

零件编号

产品描述 (功能)

生产厂家

3974

DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER

Allegro MicroSystems 

3974

DMOS DUAL FULL-BRIDGE

PWM MOTOR DRIVER

FUNCTIONAL BLOCK DIAGRAM

VDD

LOGIC

SUPPLY

CHARGE PUMP

BANDGAP

VDD

CREG

TSD

UNDER-

VOLTAGE &

FAULT DETECT

CHARGE

PUMP

VBB1

+

LOAD

SUPPLY1

BANDGAP

REGULATOR

VREG

CONTROL LOGIC

OUT1A

ENABLE1

OSC

CLOCK

DATA

STROBE

FIXED OFF

PROGRAMMABLE BLANK

PWM TIMER

DECAY

SERIAL

PORT

FIXED OFF

PROGRAMMABLE BLANK

PWM TIMER

DECAY

ZERO CURRENT DETECT

CURRENT SENSE

REFERENCE

BUFFER &

DIVIDER

CHARGE

PUMP

OUT1B

SENSE1

CS1

RS1

REF1

LOAD

SUPPLY2

+

VREF

VBB2

SLEEP

MODE

ENABLE2

CONTROL LOGIC

TO PWM TIMER

ZERO CURRENT DETECT

CURRENT SENSE

REFERENCE

BUFFER &

DIVIDER

OUT2A

OUT2B

SENSE2

CS2

RS2

REF2

VREF2

Dwg. FP-048-1

2

115 Northeast Cutoff, Box 15036

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

Copyright © 2001 Allegro MicroSystems, Inc.

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