NJM3771
DUAL STEPPER MOTOR DRIVER
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GENERAL DESCRIPTION
The NJM3771 is a stepper motor driver, which circuit is
especially developed for use in microstepping applications in
conjunction with the matching dual DAC (Digital-to-Analog
Converter) NJU39610.
The NJM3771 contains a clock oscillator, which is common
for both driver channels; a set of comparators and flip-flops
imple menting the switching control; and two H-bridges with
internal recirculation diodes. Voltage supply requirements are
+5 V for logic and +10 to +45 V for the motor. Maximum
output current is 650 mA per channel.
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PACKAGE OUTLINE
NJM3771D2
NJM3771E3
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FEATURES
• Dual chopper driver
• 650 mA output current per channel
• Selectable slow/fast current decay for improved high-
speed microstepping
• Specially matched to Dual DAC NJU39610
• Packages DIP22 / EMP24(Batwing) / PLCC28
NJM3771FM2
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BLOCK DIAGRAM
Phase
1
CD
1
V
R1
C
1
E
1
NJM 3771
V
CC
V
–
+
CC
R
S
Q
M
A1
+
–
Logic
M
B1
V
MM1
+
–
V
MM2
M
B2
Logic
S
R
Q
M
A2
–
+
RC
+
–
Phase
2
CD
2
V
R2
C
2
GND
E
2
Figure 1. Block diagram
NJRC [ NEW JAPAN RADIO ]
