NJM3777E3

NJM3777 DUAL STEPPER MOTOR DRIVER s GENERAL DESCRIPTION The NJM3777 is a switch-mode (chopper), constant-current driver with two channels: one for each winding of a two-phase stepper motor. The NJM3777 is equipped with a Disable input to simplify half-stepping operation. The NJM3777 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 900mA per channel. s PACKAGE OUTLINE NJM3777E3 s FEATURES Dual chopper driver 900 mA continuous output current per channel Digital filter on chip eliminates external filtering components Package EMP24(Batwing) s BLOCK DIAGRAM Phase1 Dis1 VR1 C1 NJM3777 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 V MM1 VMM2 M B2 M A2 s PIN CONFIGURATION NJM3777 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 3777E3 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 configuration s PIN DESCRIPTION EMP 1 2 3 4 5 6, 7, 18, 19 8 9 10 11 12 13 14 15 16 17 20 21 22 23 24 Symbol NC M B1 E1 MA1 VMM1 GND VR1 C1 Phase1 Dis 1 RC VCC Dis2 Phase 2 C2 VR2 VMM2 M A2 E 2 MB2 NC Description Not connected Motor output B, channel 1. Motor cur...