Features: 1.9V-42V DC power supply, 2. Bipolar constant current PWM drive output. 3. Optically isolated input signal, pulse response frequency up to 200kHz. 4. Strong anti-interference ability, high-precision positioning in complex environments. 5. Low-speed zero vibration, low noise. 6. Suitable for 42/57 stepper motors, widely used in automatic packaging machines, engraving machines and other automation equipment. Specifications: Model: DM556 Application: 42/57 Stepper Motor 0.5A resolution Drive mode: bipolar constant current PWM drive Pulse response frequency: 200kHz (Max) Insulation resistance: ;500M Dielectric strength: 500V/min Size: 118*75.5*34mm / 4.6*3.0*1.3in Packing list: 1 * Steeper motor driver