Features: Suitable for two-phase / four-phase / four-wire / six-wire stepper motors up to 42, 57, 86, 110, 4.5A. The main control chip of the ARM-CortexTM 32-bit core. Advanced digital closed-loop current control technology, higher step accuracy, lower noise, and greatly superior to traditional chopper current control technology. Stepping smoothing technology greatly reduces the stepping vibration at low frequency and large stepping. Synchronous rectification technology reduces heat generation. It contains a 1us digital filter to greatly improve the anti-interference ability. Automatic semi-flow function. Independent power field tube structure. Offline/enable control. Input signal optocoupler isolation. Independent power terminal for easy use. Overheating protection. Wrong phase and short circuit protection. TVS transient diode power surge protection. Specification: Maximum step pulse frequency: up to 500Khz Current: 1-4.5A 8-speed adjustable, 0.5A increment Operating voltage range: 20-56V 16-segment subdivision: full step, half step, 1/4 step, 1/8 step, 1/16 step, 1/32 step, 1/64, 1/128 step, 1/5 step, 1/10 step, 1/15 steps, 1/20 steps, 1/25 steps, 1/30 steps, 1/40, 1/50 steps, maximum 128 subdivision Package weight: Approx. 285 g/10.05 oz Package list: 1 * Stepper Motor Driver