Stepper Motor Driver IC
MTD1121F
■Block diagram / Typical application
Vz
Vcc
Vmm
1
COM
OUT B
OUT B
Vcc
OUT A OUT A
IN A
IN A
IN B
IN B
CPU
or
GATE
ARRAY
CPU
or
GATE
ARRAY
CR B
CR A
ONE
SHOT
ONE
SHOT
-
+
-
+
LG
Rs A
PG B Rs B
PG A
Vref A
Vcc
Vs B
Rf
Vref B
Ct
Rt
Vs A
Rf
Rt
Ct
TAB
R1
Cf
Cf
Rs
Rs
R2
●Recommended component values
Recommended value
●Constant chopping current level
Symbol
Unit
Ω
Vref
=
Rs
0.68
Ichop
Rs
Cf
3300
pF
Rf
1.0
3300
kΩ
pF
Ct
Rt
8.2
kΩ
V
Vz
Vmm×1.2～1.5
＜10
●One shot offꢀtime
R1+R2
ｋΩ
toff = 0.69×Ct×Rt
Shindengen Electric Mfg.Co.Ltd
W1001
SHINDENGEN [ SHINDENGEN ELECTRIC MFG.CO.LTD ]
