NJM3717
STEPPER MOTOR DRIVER
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GENERAL DESCRIPTION
NJM3717 is a stepper motor diver, which consists of a LS-TTL
compatible logic input stage, a current sensor, a monostable
multivibrator and a high power H-bridge output stage with built-in
protection diodes.
The output current is up to 1200mA. Two NJM3717 and a small
number of external components form a complete control and drive
unit for stepper motor systems.
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PACKAGE OUTLINE
NJM3717D2
NJM3717E2
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FEATURES
• Half-step and full-step modes
• Switched mode bipolar constant current drive
• Wide range of current control
• Wide voltage range 10 - 50 V
• Thermal overload protection
• Packages
DIP16 / PLCC28 / EMP20
5 - 1200 mA
NJM3717FM2
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BLOCK DIAGRAM
V
CC
Schmitt
Trigger
Time
Delay
V
MM
V
MM
Phase
I1
I0
V
R
1
1
1
MA
MB
&
+
–
+
–
+
–
GND
&
&
&
≥
1
≥
1
Output Stage
Monostable
t
off
= 0.69 • R
T
• C
T
Current Sensor
NJM3717
T
E
Figure 1. Block diagram
NJRC [ NEW JAPAN RADIO ]
