Designated client product This product will be discontinued its production in the near term. And it is provided for customers currently in use only, with a time limit. It can not be available for your new project. Please select other new or existing products. For more information, please contact our sales office in your region. New Japan Radio Co.,Ltd. www.njr.com NJM3774 DUAL STEPPER MOTOR DRIVER n GENERAL DESCRIPTION n PACKAGE OUTLINE The NJM3774 is a switch-mode (chopper), constant- current 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 con- NJM3774D2 NJM3774FM2 tains 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. n FEATURES Dual chopper driver 1000 mA continuous output current per channel Specially matched to the Dual DAC NJU39610 Packages DIP22 / PLCC28 n BLOCK DIAGRAM Phase Dis V C E 1 1 1 R1 1 NJM3774 V V CC CC Q R + S M A1 M Logic B1 V MM1 + V MM2 M B2 Logic M A2 RC S Q + R Phase Dis V C GND E 2 2 2 2 R2 Figure 1. Block diagram