NJM3773 Datasheet, PDF (1/9 Pages) New Japan Radio – DUAL STEPPER MOTOR DRIVER

DUAL STEPPER MOTOR DRIVER
NJM3773
s GENERAL DESCRIPTION
The NJM3773 is a switch-mode (chopper), constant-current
driver with two channels: one for each winding of a two-phase
stepper motor. The NJM3773 is also equipped with a Disable
input to simplify half-stepping operation. The circuit is well
suited for microstepping applications together with an external
micro controller. The current control inputs are low current,
high impedance inputs, which allows the use of unbuffered
DAC or external high resistive resistor divider network. The
NJM3773 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 750mA per channel.
s PACKAGE OUTLINE
NJM3773D2 NJM3773E3
NJM3773FM2
s FEATURES
• Dual chopper driver
• 750 mA continuous output current per channel
• High impedance current control inputs
• Digital filter on chip eliminates external filtering components
• Packages DIP22 / PLCC28 / EMP24(Batwing)
s BLOCK DIAGRAM
Phase ₁
Dis₁ V_R1
C₁
NJM3773
V_CC
V
CC
–
+
E₁
RQ
S
Logic
+
–
RC
Logic
+
SQ
R
–
M _A1
M _B1
V_MM1
V_MM2
M _B2
M _A2
Figure 1. Block diagram
Phase ₂
Dis ₂ V_R2
C₂
GND
E₂