Stepper motor drive circuit

TWH8751/2 is a new high-voltage, high-current switching circuit with high operating frequency (up to 1.5MHz), good switching characteristics, large control power, automatic protection and gating function, easy to use, etc. The ideal large function amplifier piece. When there is no signal, the phototransistor is turned off, and the driving power supply TWH8751/2 outputs a high level. There is no current through the armature winding. When there is a signal, the phototransistor is turned on by light, and the TMH8751/2 outputs a low level, and an excitation current passes through the armature winding.