NJM3771

NJM3771 DUAL STEPPER MOTOR DRIVER ■ GENERAL DESCRIPTION The NJM3771 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 NJM3771 contains a clock oscillator, which is common for both driver channels; a set of comparators and flip-flops imple menting the switching control; and two H-bridges with internal recirculation diodes. Voltage supply requirements are +5 V for logic and +10 to +45 V for the motor. Maximum output current is 650 mA per channel. ■ PACKAGE OUTLINE NJM3771D2 ( DIP22 ) NJM3771E3 ( SOP24 ) ■ FEATURES ● Dual chopper driver ● 650mA output current per channel ● Selectable slow / fast current decay for improved high- speed microstepping ● Specially matched to Dual DAC NJU39610 ● Packages DIP22-D2 / PLCC28-M2 SOP24 JEDEC 300 mil (Batwing) NJM3771FM2 ( PLCC28 ) ■ BLOCK DIAGRAM Ver.2011-12-08 Figure 1. Block diagram -1- NJM3771 ■ PIN CONFIGURATION Figure 2. Pin configurations ■ PIN DESCRIPTION Refer to Figure 2. SOP DIP PLCC 218 3 2 10 4 3 11 5 4 12 6, 7, 18,19 5, 6, 1-3, 9, 17, 18 13-17, 28 Symbol MB1 E1 VMM1 MA1 GND 8 7 18 Phase1 9 8 19 CD1 10 9 20 VR1 11 10 21 C1 12 11 22 VCC 13 12 23 RC 14 13 24 C2 15 14 25 VR2 16 15 26 CD2 17 16 27 Phase2 20 19 21 20 4 MA2 5 VMM2 22 21 23 22 6 E2 7 MB2 Description Motor output B, channel 1. Motor current flows from MA1 to MB1 when Phase1 is HIGH. Common ...