NJM3774

NJM3774 DUAL STEPPER MOTOR DRIVER s GENERAL DESCRIPTION The NJM3774 is a switch-mode (chopper), constantcurrent driver with two channels: one for each winding of a two-phase stepper motor. The NJM3774 is equipped with a TTL level compatible Disable input to simplify half-stepping operation. The circuit is well suited for microstepping applications together with the matching dual DAC NJU39610. In full/half stepping applications, the NJM3517 can be used as a phase generator (translator) to derive the necessary signals for the NJM3774. The NJM3774 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. Voltage supply requirements are +5 V for logic and +10 to +45 V for the motor. Maximum output current is 1000mA per channel. s PACKAGE OUTLINE NJM3774D2 NJM3774FM2 s FEATURES Dual chopper driver 1000 mA continuous output current per channel Specially matched to the Dual DAC NJU39610 Packages DIP22 / PLCC28 s BLOCK DIAGRAM Phase 1 Dis1 VR1 C1 E1 NJM3774 VCC V – + CC R S Q M A1 Logic M B1 V MM1 + – V MM2 M B2 Logic M A2 RC + – S R Q Phase 2 Dis 2 V R2 C2 GND E2 Figure 1. Block diagram NJM3774 s PIN CONFIGURATIONS RC 1 C2 2 V R2 3 VMM2 5 E2 6 M B2 7 M B1 8 GND 9 E1 10 VMM1 11 25 24 23 Phase 2 22 VCC 21 C 1 20 VR1 19 Phase 1 18 GND GND GND GND GND 28 27 Dis 2 MA2 26 4 3 2 1 VR2 C2 RC VCC C1 VR1 Phase1 Phase 2 4 GND 5 GND 6 Dis2 7 M...