PST3722PH is a 3-phase AC driver (AC110–220V, ≤7.0A) with 32-bit DSP control for low noise and smooth low-frequency microsteps. It supports 16 constant-torque microsteps (up to 60,000 steps/rev), adjustable lock current, pulse filtering, and optical isolation, with full protection. Suitable for NEMA34–51 3-phase open-loop stepper motors.