NJM3771FM2-TE3 Nisshinbo

NJM3771 DUAL STEPPER MOTOR DRIVER n GENERAL DESCRIPTION n PACKAGE OUTLINE 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 NJM3771E3 NJM3771D2 +5 V for logic and +10 to +45 V for the motor. Maximum output current is 650 mA per channel. n FEATURES NJM3771FM2 Dual chopper driver 650 mA output current per channel Selectable slow/fast current decay for improved high- speed microstepping Specially matched to Dual DAC NJU39610 Packages DIP22 / EMP24(Batwing) / PLCC28 n BLOCK DIAGRAM E Phase CD V C 1 1 1 R1 1 NJM 3771 V V CC CC R Q + S M A1 + Logic M B1 V MM1 + V MM2 M B2 Logic M + A2 RC S Q + R Phase CD V C GND E 2 2 R2 2 2 Figure 1. Block diagram