Features:1. 24V-50V DC power supply, 8 level adjustable output current 1.0A-5.6A.2. Bipolar constant current PWM drive output.3. Optical isolation input signal, pulse response frequency up to 200kHz.4. Strong anti-interference capability, achieve high precision positioning in complicated environment.5. Low speed zero vibration, and low noise.6. Fit for 42/57 stepper motor and widely used in automatic packaging machine, engraving machine and other automation equipments.Specification:Model: DM556Application: 42/57 stepper motorInput voltage: DC 20-50VOutput current: 1.0-5.6A, 8 level adjustable, 0.5A resolutionDrive method: Bipolar constant current PWM drivePulse response frequency: 200kHz(Max)Insulation resistance: >500MInsulation strength: 500V/minDimensions: 118*75.5*34mm / 4.6*3.0*1.3inWeight: Approx. 270g / 9.5ozPackage list:1 * Steeper Motor Driver.