A3948(2007) View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

Manufacturer

A3948
(Rev.:2007)

DMOS FULL-BRIDGE PWM MOTOR DRIVER

Allegro MicroSystems 

3948

DMOS FULL-BRIDGE

PWM MOTOR DRIVER

VDD

LOGIC

SUPPLY

FUNCTIONAL BLOCK DIAGRAM

VBB

+

LOAD

SUPPLY

CHARGE PUMP

BANDGAP

VDD

CREG

TSD

UNDER-

VOLTAGE &

FAULT DETECT

CHARGE

PUMP

BANDGAP

REGULATOR

VREG

MODE

PHASE

ENABLE

CONTROL LOGIC

OUTA

OUTB

OSC

FIXED OFF

PROGRAMMABLE BLANK

PWM TIMER

DECAY

CLOCK

DATA

STROBE

RANGE

SERIAL

PORT

SLEEP

MODE

ZERO

CURRENT

DETECT

CURRENT

SENSE

RANGE

REFERENCE

BUFFER &

DIVIDER

SENSE

CS

RS

REF

VREF

Dwg. FP-048

CP2 1

CP1 2

PHASE

θ

3

CHARGE PUMP

24 CP

23 VREG

22 RANGE

OSC 4

GROUND 5

GROUND 6

GROUND 7

21 OUTB

VBB

20

LOAD

SUPPLY

19 GROUND

18 GROUND

A3948SB (DIP)

Note that the A3948SLB (SOIC) and A3948SB

(DIP) do not share a common terminal

assignment.

GROUND 8

LOGIC

SUPPLY

99 VDD

ENABLE 10

DATA 11

÷

CLOCK 12

SERIAL PORT

17 SENSE

16 OUTA

15 MODE

14 REF

13 STROBE

Dwg. PP-069-1A

115 Northeast Cutoff, Box 15036

2

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

Copyright © 2001, 2002 Allegro MicroSystems, Inc.

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