NJM3776 Datasheet, PDF (1/9 Pages) New Japan Radio – DUAL CONTROLLER FOR HIGH-CURRENT STEPPER MOTOR

NJM3776
DUAL CONTROLLER FOR HIGH-CURRENT STEPPER MOTOR
s GENERAL DESCRIPTION
The NJM3776 is a switch-mode (chopper), constant-current
controller intended for controlling external transistors in a high
current stepper motor application. The NJM3776 has two channels,
one for each winding of a two-phase stepper motor. The NJM3776
is equipped with a Disable input to simplify half stepping operation.
The NJM3776 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 sections each containing four
outputs, two source and two sink, intended to drive an external H-
bridge. Voltage supply requirements are +5 V for logic and +10 to
+45 V for the outputs.
s PACKAGE OUTLINE
NJM3776D2
s FEATURES
• Suitable to drive any external MOS FET or bipolar power transistor
• Cross conduction prevented by time delay
• Digital filter on chip eliminates external filtering components
• Package DIP24
s BLOCK DIAGRAM
Phase ₁
Dis ₁ V_R1
C1
SGND ₁
Pwr GND ₁
1
NJM3776
V_CC
V
CC
–
+
RQ
S
Logic
RC
Figure 1. Block diagram
+
–
Logic
+
SQ
R
–
Phase ₂
Dis2 V_R2
C2
SGND ₂
Pwr GND ₂
T1BL
T1AL
T1AU
T1BU
VBB1
V_BB2
T2BU
T2AU
T2AL
T2BL