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3968 Datasheet(PDF) 2 Page - Allegro MicroSystems

Part No. 3968
Description  DUAL FULL-BRIDGE PWM MOTOR DRIVER WITH BRAKE
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

3968 Datasheet(HTML) 2 Page - Allegro MicroSystems

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3968
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
WITH BRAKE
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1997, 2003 Allegro MicroSystems, Inc.
FUNCTIONAL BLOCK DIAGRAM
(one-half of circuit shown)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OUT1B
GROUND
Dwg. PP-066-3
OUT
1A
INPUT1A
OUT2A
SENSE 1
INPUT1B
LOAD
SUPPLY
REFERENCE
INPUT2A
INPUT2B
SENSE 2
OUT 2B
LOGIC
SUPPLY
RC
RC
V
REF
V
CC
V
BB
GROUND
A3968SA (DIP)
÷4
V CC
INPUTA
V BB
RC
R T
C T
GROUND
R S
Dwg. FP-036-4
SENSE
UVLO
& TSD
BLANKING
GATE
Q
R
S
PWM LATCH
+
CURRENT-SENSE
COMPARATOR
INPUTB
OSC
TO OTHER
BRIDGE
TO OTHER
BRIDGE
TO OTHER
BRIDGE
+
TRUTH TABLE
INPUTA
INPUTB
OUTA
OUTB
Description
LLLL
Brake mode
L
H
L
H
“Forward”
H
L
H
L
“Reverse”
H
H
Z
Z
Disable
Z = High impedance


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