NJM3775FM2

NJM3775 DUAL STEPPER MOTOR DRIVER s GENERAL DESCRIPTION The NJM3775 is a switch-mode (chopper), constant- current driver with two channels: one for each winding of a two-phase stepper motor. NJM3775 is equipped with a Disable input to simplify half-stepping operation. The NJM3775 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 H-bridges, including recirculation diodes. Voltage supply requirements are + 5 V for logic and + 10 to + 45 V for the motor. Maximum output current is 750mA per channel. s PACKAGE OUTLINE NJM3775D2 NJM3775E3 NJM3775FM2 s FEATURES Dual chopper driver 750 mA continuous output current per channel Digital filter on chip eliminates external filtering components Packages DIP22 / PLCC28 / EMP24(batwing) s BLOCK DIAGRAM Phase 1 Dis1 VR1 C1 NJM3775 VCC VCC — + E1 RQ S Logic + — RC Logic + SQ R — Phase 2 Dis 2 VR2 C2 GND E2 Figure 1. Block diagram M A1 M B1 VMM1 VMM2 M B2 M A2 s PIN CONFIGURATIONS NC 1 MB1 2 E1 3 MA1 4 VMM1 5 GND 6 GND 7 VR1 8 C1 9 Phase1 10 Dis1 11 RC 12 NJM 3775E3 24 NC 23 MB2 22 E2 21 MA2 20 VMM2 19 GND 18 GND 17 VR2 16 C2 15 Phase2 14 Dis2 13 Vcc Figure 2. Pin configurations NJM3775 MB1 1 22 MB2 E1 2 MA1 3 21 E2 20 MA2 VMM1 4 19 VMM2 GND 5 GND 6 VR1 7 NJM 3775D2 18 GND 17 GND 16 V R2 C1 8 Phase1 9 15 C2 14 Phase 2 Dis1 10 13 Dis2 RC 11 12 VCC VMM1 12 GND 13 GND 14 GND 15 GND 16 G...