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3957 Datasheet(PDF) 13 Page - Allegro MicroSystems

Part # 3957
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

3957 Datasheet(HTML) 13 Page - Allegro MicroSystems

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3957
FULL-BRIDGE PWM
MICROSTEPPING
MOTOR DRIVER
Full
1/2
1/4
1/8
1/16
Bridge A
Bridge B
Step
Step Step Step Step Step
PHASEA D3A
D2A
D1A
D0A
ILOAD A
PHASEB D3B
D2B
D1B
D0B
ILOAD B
angle
11111
H
H
H
H
H
100%
X
L
L
L
X
0%
0
°
2
H
H
H
H
H
100%
H
L
L
H
L
17.4%
2
3
H
H
H
H
H
100%
H
L
L
H
H
26.1%
4
H
H
H
H
L
95.7%
H
L
H
L
L
34.8%
2
3
5
H
H
H
L
H
91.3%
H
L
H
L
H
43.5%
6
H
H
H
L
L
87.0%
H
L
H
H
L
52.2%
4
7
H
H
L
H
H
82.6%
H
L
H
H
H
60.9%
8
H
H
L
H
L
78.3%
H
H
L
L
L
69.6%
2359
H
H
L
L
H
73.9%
H
H
L
L
H
73.9%
45
°
10
H
H
L
L
L
69.6%
H
H
L
H
L
78.3%
6
11
H
L
H
H
H
60.9%
H
H
L
H
H
82.6%
12
H
L
H
H
L
52.2%
H
H
H
L
L
87.0%
4
7
13
H
L
H
L
H
43.5%
H
H
H
L
H
91.3%
14
H
L
H
L
L
34.8%
H
HHHL
95.7%
8
15
H
L
L
H
H
26.1%
H
H
H
H
H
100%
16
H
L
L
H
L
17.4%
H
H
H
H
H
100%
2359
17
X
L
L
L
X
0%
H
H
H
H
H
100%
90
°
18
L
L
L
H
L
-17.4%
H
H
H
H
H
100%
10
19
L
L
L
H
H
-26.1%
H
H
H
H
H
100%
20
L
L
H
L
L
-34.8%
H
HHHL
95.7%
6
11
21
L
L
H
L
H
-43.5%
H
H
H
L
H
91.3%
22
L
L
H
H
L
-52.2%
H
H
H
L
L
87.0%
12
23
L
L
H
H
H
-60.9%
H
H
L
H
H
82.6%
24
L
H
L
L
L
-69.6%
H
H
L
H
L
78.3%
4
7
13
25
L
H
L
L
H
-73.9%
H
H
L
L
H
73.9%
135
°
26
L
H
L
H
L
-78.3%
H
H
L
L
L
69.6%
14
27
L
H
L
H
H
-82.6%
H
L
H
H
H
60.9%
28
L
H
H
L
L
-87.0%
H
L
H
H
L
52.2%
8
15
29
L
H
H
L
H
-91.3%
H
L
H
L
H
43.5%
30
L
H
H
H
L
-95.7%
H
L
H
L
L
34.8%
16
31
L
H
H
H
H
-100%
H
L
L
H
H
26.1%
32
L
H
H
H
H
-100%
H
L
L
H
L
17.4%
3
5
9
17
33
L
H
H
H
H
-100%
X
L
L
L
X
0%
180
°
34
L
H
H
H
H
-100%
L
L
L
H
L
-17.4%
18
35
L
H
H
H
H
-100%
L
L
L
H
H
-26.1%
36
L
H
H
H
L
-95.7%
L
L
H
L
L
-34.8%
10
19
37
L
H
H
L
H
-91.3%
L
L
H
L
H
-43.5%
38
L
H
H
L
L
-87.0%
L
L
H
H
L
-52.2%
20
39
L
H
L
H
H
-82.6%
L
L
H
H
H
-60.9%
40
L
H
L
H
L
-78.3%
L
H
L
L
L
-69.6%
6
11
21
41
L
H
L
L
H
-73.9%
L
H
L
L
H
-73.9%
225
°
42
L
H
L
L
L
-69.6%
L
H
L
H
L
-78.3%
22
43
L
L
H
H
H
-60.9%
L
H
L
H
H
-82.6%
44
L
L
H
H
L
-52.2%
L
H
H
L
L
-87.0%
12
23
45
L
L
H
L
H
-43.5%
L
H
H
L
H
-91.3%
46
L
L
H
L
L
-34.8%
L
HHHL
-95.7%
24
47
L
L
L
H
H
-26.1%
L
H
H
H
H
-100%
48
L
L
L
H
L
-17.4%
L
H
H
H
H
-100%
4
7
13
25
49
X
L
L
L
X
0%
L
H
H
H
H
-100%
270
°
50
H
L
L
H
L
17.4%
L
H
H
H
H
-100%
26
51
H
L
L
H
H
26.1%
L
H
H
H
H
-100%
52
H
L
H
L
L
34.8%
L
HHHL
-95.7%
14
27
53
H
L
H
L
H
43.5%
L
H
H
L
H
-91.3%
54
H
L
H
H
L
52.2%
L
H
H
L
L
-87.0%
28
55
H
L
H
H
H
60.9%
L
H
L
H
H
-82.6%
56
H
H
L
L
L
69.6%
L
H
L
H
L
-78.3%
8
15
29
57
H
H
L
L
H
73.9%
L
H
L
L
H
-73.9%
315
°
58
H
H
L
H
L
78.3%
L
H
L
L
L
-69.6%
30
59
H
H
L
H
H
82.6%
L
L
H
H
H
-60.9%
60
H
H
H
L
L
87.0%
L
L
H
H
L
-52.2%
16
31
61
H
H
H
L
H
91.3%
L
L
H
L
H
-43.5%
62
H
H
H
H
L
95.7%
L
L
H
L
L
-34.8%
32
63
H
H
H
H
H
100%
L
L
L
H
H
-26.1%
64
H
H
H
H
H
100%
L
L
L
H
L
-17.4%
Table 4 — Step Sequencing



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