NJM3777 Datasheet, PDF (1/10 Pages) New Japan Radio – DUAL STEPPER MOTOR DRIVER

NJM3777
DUAL STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
The NJM3777 is a switch-mode (chopper), constant-current
driver with two channels: one for each winding of a two-phase
stepper motor. The NJM3777 is equipped with a Disable input
to simplify half-stepping operation. The NJM3777 contains a
clock oscillator, which is common for both driver channels, a
set of comparators and flip-flops implementing the switching
control, and two output H-bridges, including recirculation
diodes. Voltage supply requirements are + 5 V for logic and +
10 to + 45 V for the motor. Maximum output current is 900mA
per channel.
s PACKAGE OUTLINE
NJM3777E3
s FEATURES
• Dual chopper driver
• 900 mA continuous output current per channel
• Digital filter on chip eliminates external filtering components
• Package EMP24(Batwing)
s BLOCK DIAGRAM
Phase₁
Dis₁ V_R1
C₁
NJM3777
V_CC
V_CC
–
+
E₁
RQ
S
Logic
+
–
RC
Logic
+
SQ
R
–
Phase ₂
Dis ₂ V_R2
C₂
GND
E₂
Figure 1. Block diagram
M _A1
M _B1
V _MM1
V_MM2
M _B2
M _A2