Full-Bridge PWM Microstepping Motor Driver
A4975
10
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Bridge A Bridge B
Full Half Quarter Eighth
Step Step Step Step PHASE
A
D
2A
D
1A
D
0A
I
LOADA
PHASE
B
D
2B
D
1B
D
0B
I
LOADB
1 1 1 1 H H L L 70.7% H H L L 70.7%
2 H L H H 55.5% H H L H 83.1%
2 3 H L H L 38.2% H H H L 92.4%
4 H L L H 19.5% H H H H 100%
2 3 5 X L L L 0% H H H H 100%
6 L L L H -19.5% H H H H 100%
4 7 L L H L -38.2% H H H L 92.4%
8 L L H H -55.5% H H L H 83.1%
2 3 5 9 L H L L -70.7% H H L L 70.7%
10 L H L H -83.1% H L H H 55.5%
6 11 L H H L -92.4% H L H L 38.2%
12 L H H H -100% H L L H 19.5%
4 7 13 L H H H -100% X L L L 0%
14 L H H H -100% L L L H -19.5%
8 15 L H H L -92.4% L L H L -38.2%
16 L H L H -83.1% L L H H -55.5%
3 5 9 17 L H L L -70.7% L H L L -70.7%
18 L L H H -55.5% L H L H -83.1%
10 19 L L H L -38.2% L H H L -92.4%
20 L L L H -19.5% L H H H -100%
6 11 21 X L L L 0% L H H H -100%
22 H L L H 19.5% L H H H -100%
12 23 H L H L 38.2% L H H L -92.4%
24 H L H H 55.5% L H L H -83.1%
4 7 13 25 H H L L 70.7% L H L L -70.7%
26 H H L H 83.1% L L H H -55.5%
14 27 H H H L 92.4% L L H L -38.2%
28 H H H H 100% L L L H -19.5%
8 15 29 H H H H 100% X L L L 0%
30 H H H H 100% H L L H 19.5%
16 31 H H H L 92.4% H L H L 38.2%
32 H H L H 83.1% H L H H 55.5%
Table 4 — Step Sequencing
