SMD-2H057MK driver is used to drive two-phase Hybrid stepping motor. The driver is equipped with the imported module to realize high frequency chopped wave. It is featured with constant current driving, very strong anti-interference performance, good high frequency performance, high starting frequency, optical isolation between the control signal and internal signal, current in optional, simple structure, stable operation, high reliability and less noise. It can drive all 57 frame series two-phase Hybrid stepping motors with currency less than 3A.