Document
DUAL STEPPER MOTOR DRIVER
NJM3772
s GENERAL DESCRIPTION
The NJM3772 is a stepper motor driver, which circuit is especially developed for use in microstepping applications in conjunction with the matching dual DAC (Digital-to-Analog Converter) NJU39610.
The NJM3772 contains a clock oscillator, which is common for both driver channels, a set of comparators and flip-flops implementing the switching control, and two H-bridges with internal recirculation diodes. Voltage supply requirements are +5 V for logic and +10 to +45V for the motor. Maximum output current is 1000mA per channel.
s PACKAGE OUTLINE
NJM3772D2
NJM3772FM2
s FEATURES • Dual chopper driver • 1000mA continuous output current per channel • Specially matched to the Dual DAC NJU39610 • Packages DIP22 / PLCC28
s BLOCK DIAGRAM
NJM 3772
Phase 1 VR1
C1
VCC
V CC
— +
VMM1
E1
RQ S
Logic
+ —
RC
Logic
+
SQ
R
—
Phase 2 VR2
C2
GND
VMM2
E2
M A1 M B1
VBB1 VBB2
M B2 M A2
Figure 1. Block diagram
s PIN CONFIGURATIONS
NJM3772
4 MA2 3 GND 2 GND 1 GND 28 GND 27 VMM2 26 Phase2
MA1 12 GND 13 GND 14 GND 15 GND 16 GND 17 VMM1 18
VBB2 5 E2 6
M B2 7 M B1 8 GND 9
E1 10 VBB1 11
NJM3772FM2
25 VR2 24 C2 23 RC 22 VCC 21 C1 20 VR1 19 Phase1
RC 1 C2 2 V R2 3 Phase 2 4 GND 5 GND 6 VMM2 7 MA2 8 VBB2 9 E2 10 MB2 11
NJM 3772D2
22 VCC 21 C1 20 VR1 19 Phase1 18 GND 17 GND 16 VMM1 15 MA1 14 VBB1 13 E1 12 MB1
Figure 2. Pin configurations
s PIN DESCRIPTION
PLCC DIP
Symbol
1-3, 9, 5, 6 GND
13-17 17, 18
28
4
8
M
A2
5
9
V
BB2
6
10
E2
7
11
MB2
8
12
MB1
10
13
E1
11 14 V BB1
12
15
MA1
18
16
VMM1
19
19
Phase1
20 20 V R1
21
21
C1
22
22
VCC
23 1
RC
24 2
C2
25 3 26 4 27 7
VR2 Phase
2
VMM2
Description
Ground and negative supply. Note: these pins are used thermally for heat-sinking.
Make sure that all ground pins are soldered onto a suitably large copper ground
plane for efficient heat sinking.
Motor output A, channel 2. Motor current flows from M to M when Phase is HIGH.
A2
B2
2
Collector of upper output transistor, channel 2. For lowest possible power dissipation, connect a
series resistor RB2 to VMM2. See Applications information, External components. Common emitter, channel 2. This pin connects to a sensing resistor RS to ground. Motor output B, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH. Motor output B, channel 1. Motor current flows from MA1 to MB1 when Phase1 is HIGH. Common emitter, channel 1. This pin connects to a sensing resistor RS to ground. Collector of upper output transistor, channel 1. For lowest possible power dissipation, connect a
series resistor RB1 to VMM1. See Applications information, External components. Motor output A, channel 1. Motor current flows from MA1 to MB1 when Phase1 is HIGH. Motor supply voltage, channel 1, +10 to +40 V. VMM1 and VMM2 should be connected together. Controls the direction of motor current at outputs MA1 and MB1. Motor current flows from MA1 to MB1 when Phase1 is HIGH. R.