The driver is suitable to 5 phase stepping motor. It uses constant current driving method, its rated driving current is 1.4A/phase, and it just used DC power(range: DC 15 - 45V,>3A.). Except that, the driver owns a very compact size for users to install easily and includes lots of advantages as following: low noise, precise action control and so on. We use photo - coupler at input port to isolate the noise and design a special socket at I/O port to achieve user - friendly.