NJM3774 Datasheet, PDF (1/9 Pages) New Japan Radio – DUAL STEPPER MOTOR DRIVER

NJM3774
DUAL STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
The NJM3774 is a switch-mode (chopper), constant-
current driver with two channels: one for each winding of a
two-phase stepper motor. The NJM3774 is equipped with a
TTL level compatible Disable input to simplify half-stepping
operation. The circuit is well suited for microstepping
applications together with the matching dual DAC
NJU39610. In full/half stepping applications, the NJM3517
can be used as a phase generator (translator) to derive the
necessary signals for the NJM3774. The NJM3774 con-
tains 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. Voltage
supply requirements are +5 V for logic and +10 to +45 V for
the motor. Maximum output current is 1000mA per channel.
s PACKAGE OUTLINE
NJM3774D2 NJM3774FM2
s FEATURES
• Dual chopper driver
• 1000 mA continuous output current per channel
• Specially matched to the Dual DAC NJU39610
• Packages DIP22 / PLCC28
s BLOCK DIAGRAM
Phase ₁
Dis₁ V_R1
C₁
NJM3774
V_CC
V
CC
–
+
E₁
RQ
S
Logic
+
–
RC
Logic
+
SQ
R
–
Figure 1. Block diagram
Phase ₂
Dis ₂ V_R2
C₂
GND
E₂
M _A1
M _B1
V_MM1
V_MM2
M _B2
M _A2