NJM3774FM2

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 NJM3774 VCC V CC – + E1 RQ S Logic + – RC Logic + SQ R – Figure 1. Block diagram Phase 2 Dis 2 VR2 C2 GND E2 M A1 M B1 VMM1 VMM2 M B2 M A2 NJM3774 s PIN CONFIGURATIONS M A1 12 GND 13 GND 14 GND 15 GND 16 GND 17 Dis 1 18 4 MA2 3 GND 2 GND 1 GND 28 GND 27 Dis 2 26 Phase2 VMM2 5 E2 6 M B2 7 M B1 8 GND 9 E1 10 VMM111 NJM3774FM2 25 VR2 24 C2 23 RC 22 VCC 21 C1 20 VR1 19 Phase1 RC 1 22 VCC C2 2 ...