A3986
Dual Full-Bridge MOSFET Driver
with Microstepping Translator
STEP
100
71
STEP
100
71
Slow
Slow
Mixed
Slow
Mixed
I
OUT1B
(%*)
Phase = 1,
Direction = H
0
Home Microstep Position
Slow
I
OUT1B
(%*)
Phase = 1,
Direction = H
Home Microstep Position
0
Mixed
Home Microstep Position
–71
–100
100
71
–71
–100
100
71
Slow Slow
Mixed
Mixed
Slow
Mixed
Slow
I
OUT2B
(%*)
Phase = 2,
Direction = H
0
I
OUT2B
(%*)
Phase = 2,
Direction = H
Slow
–71
–100
–71
–100
0
*For precise definition of output levels, refer to table 3
*For precise definition of output levels, refer to table 3
Figure 2. Decay Mode for Full-Step Increments
STEP
100
92
71
38
Figure 3. Decay Modes for Half-Step Increments
I
OUT1B
(%*)
Phase = 1,
Direction = H
Slow
0
Mixed
Home Microstep Position
Slow
Mixed
Slow
–38
–71
–92
–100
100
92
71
38
Slow
Mixed
Slow
Mixed
Slow
Mixed
I
OUT2B
(%*)
Phase = 2,
Direction = H
0
–38
–71
–92
–100
*For precise definition of output levels, refer to table 3
Figure 4. Decay Modes for Quarter-Step Increments
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Home Microstep Position
8
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
