Data Sheet

DMOS Microstepping Driver with Translator
and Overcurrent Protection
A4988
11
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
V
STEP
I
OUT
I
OUT
t
See Enlargement A
Enlargement A
t
SD
t
FD
t
off
Slow Decay
Mixed Decay
Fast Decay
I
PEAK
70.71
–70.71
0
100.00
–100.00
Symbol Characteristic
t
off
Device fixed off-time
I
PEAK
Maximum output current
t
SD
Slow decay interval
t
FD
Fast decay interval
I
OUT
Device output current
Figure 7. Current Decay Modes Timing Chart