SHINDENGEN
Stepper Motor Driver ICs
g
Internal equation circuit / Typical application
Vcc=5V
Vcc=5V
Alarm
Feedback
19
Vcc
OUT1
3
7
OUT2
1
VmmA
VmmB
14
OUT3
8
12
OUT4
ALARM
120deg. 140deg.
MTD2006F
24
ALARM
CPU
or
GATE ARRAY
27
16
GATE CIRCUIT
26
PHA A
GATE CIRCUIT
PHA B
17
18
DECAY
DECAY
Vcc=5V
BLANK
Q
Rt
25
CR
Ct
LG A
28
VrefA
23
OSC
R
S
-
+
Current
Sensor
Current
Sensor
-
+
R
S
Q
Vcc=5V
R1
VsA
22
5
RsA
TAB
PG
VsB
RsB
10
21
20
VrefB
15
LG B
R2
Rs
Rs
Recommended component values
Constant chopping current level
Io =
Vref
Rs
Chopping frequency
f=
1
0.75・Ct・Rt
Symbol
Rt
Ct
R1+R2
Value
7.5 to 30
2200 to 4700
≦10
Shindengen Electric Mfg.Co.Ltd
CPU
or
GATE ARRAY
ENA A
ENA B
Unit
kΩ
pF
kΩ
0212