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3955 Datasheet(PDF) 2 Page - Allegro MicroSystems

Part # 3955
Description  FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER
PDF  16 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

3955 Datasheet(HTML) 2 Page - Allegro MicroSystems

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3955
FULL-BRIDGE PWM
MICROSTEPPING
MOTOR DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
FUNCTIONAL BLOCK DIAGRAM
9
2
8
14
D/A
VCC
6
PHASE
7
16
10
15
PFD
1
+
–
VBB
RC
GROUND
4
5
R S
Dwg. FP-042
SENSE
11
12
13
VCC
BLANKING
UVLO
& TSD
Q
R
S
PWM LATCH
+ –
VTH
R T
C T
3
MIXED-DECAY
COMPARATOR
+
–
÷3
DISABLE
CURRENT-SENSE
COMPARATOR
BLANKING
GATE
W
Copyright © 1997 Allegro MicroSystems, Inc.
Table 1 — PHASE Truth Table
PHASE
OUTA
OUTB
HH
L
LL
H
Table 2 — PFD Truth Table
VPFD
Description
≥3.5 V
Slow Current-Decay Mode
1.1 V to 3.1 V
Mixed Current-Decay Mode
≤0.8 V
Fast Current-Decay Mode



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