NJM3770A Datasheet, PDF (1/10 Pages) New Japan Radio – STEPPER MOTOR DRIVER

NJM3770A
STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
NJM3770A is a stepper motor driver, which consists of a
LS-TTL compatible logic input stage, a current sensor, a
monostable multivibrator and a high power H-bridge output
stage. The NJM3770A is a high power version and pin-
compatible with the NJM3717.Two NJM3770A and a small
number of external components form a complete control
and drive unit stepper motor systems.
s EATURES
• Half-step and full-step operation
• Switched mode bipolar constant current drive
• Wide range of current control 5 -1800 mA
• Wide voltage range 10 - 45 V
• Thermal overload protection
• Packages DIP16 (Batwing) / PLCC28 / EMP20
s PACKAGE OUTLINE
NJM3770AD3
NJM3770AE2
NJM3770AFM2
s BLOCK DIAGRAM
Phase
I
1
I₀
V_R
GND
V_CC
V_MM
V_MM
Schmitt
Trigger
Time
Delay
1
≥1
≥1
M_A
M_B
&&&&
≥1
≥1
+
–
+
–
+
–
Current Sensor
C
Output Stage
Monostable
t_off = 0.69 • R_T • C_T
T
E
NJM3770A
Figure 1. Block diagram