DM556 Stepper Motor Driver: Input Voltage: DC 20-50V; Output Current: 1.0-5.6A, 8 Level Adjustable, 0.5A Resolution. DM556 is a of High Performance Digital Stepping Driver Based On 32-Bit Technology. Two Phase Hybrid Stepper Motor of Types with Current Below 4.2A and Outer Diameter 42-66MM is Provided. Suitable for Nema 17, Nema 23 and Nema34 Stepper Motor,2-Phase Hybrid Stepper Motors (Outer Diameter: 42,57,66mm). Used for All Kinds of Small and Medium-Sized Automation Equipment and Instruments: Engraving Machine, Marking Machine, Cutting Machine, Laser Typesetting, Plotter, CNC Machine Tools, Automatic Assembly Equipment, etc. Digital Stepper Motor DriverStandard Single Pulse InterfaceProvides Energy-Saving Semi-Automatic Current Locking Function, Semi-Enclosed Housing Can Be Adapted to More Stringent EnvironmentHigh Speed Optocoupler Isolation Signal, Strong Resistance to High-Frequency InterferenceBuilt-in Overheat, Over-Current,Over-voltage and Under-voltage Protection, Can Drive 4,6, 8 Wire Two Phase Stepper Motor, Control Signal 5-24V Universal Drive Method:Bipolar Constant Current PWM Drive Pulse Response Frequency:200kHz(Max) Insulation Resistance: equal 500Mohm Insulation Strength:500V/min Colour:As Shown Material:Plastic Size:118x75.5x34mm/4.6x3.0x1.3in Package Contents: 2 x Driver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.