28
Current
Control
Phase
Control
One
Shot
Comp.
3717
+30V
A
R4 Typ
Phase
I0 current
I1 current
VREF
0v
5v
0.4v
30v
30v
2.7 mSec
00
U20 - 15
R4
J2 - 1
J2 – 3
A
B
C
D
FIG 4.1 STEPPER MOTOR DRIVE CIRCUIT
B
0v
5v
0.4v
30v
30v
2.7 mSec
00
U20 - 15
R4
J2 - 1
J2 – 3
A
B
C
D
0v
5v
0.0v
0.4v
0v
30v
30v
2.7 mSec
00
5.5 mSec
U20 - 15
R4
J2 - 1
J2 – 3
A
B
C
D
0v
C
D
