The DMD403 and DMD403A are step‑per motor drivers developed by Leatro, featuring bipolar constant‑current chopper control, a chopping frequency of 20 kHz, and support for two‑phase or four‑phase hybrid stepper motors. The drivers offer up to 256 microsteps, high‑current output (up to 3.5 A per phase), and TTL‑compatible logic inputs.
The manual details electrical parameters, mechanical dimensions, pin assignments, and wiring examples. It explains how to set subdivision and output current using dip switches, describes the input interface circuit, and provides environmental limits such as operating temperature (0 °C ~ +50 °C) and cooling methods. Contact information for Leatro’s service hotline is also included. This manual is written in Chinese.
| Maximum drive current (peak) | 3.5 A per phase |
|---|---|
| Logic input current | 6 mA – 30 mA |
| Chopping frequency | 20 kHz |
| Maximum subdivision | 256 microsteps |
| Operating temperature range | 0 °C – +50 °C |
| Cooling method | Natural or forced air cooling |
| Weight | ≈350 g |
The driver supports up to 256 microsteps per full step.