Rozwiązania i Komponenty dla AutomatykiSolutions and Components for Automation


SMC108v2 is a modern two-phase stepper motor driver developed and manufactured byWObit based on power levels made in DirectFET technology. This provided a miniaturization of the controller size with very large control currents characteristic of large and medium stepper motors with orifice sizes from 110 mm to 57 mm. The compact plastic housing allows the controller to be mounted on a typical DIN rail, and easy access to switches and signaling diodes enables quick configuration of the controller and a preview of its operation status.

SMC108v2 is a controller designed for cooperation with a two-phase stepper motor with bipolar winding (8- or 4-wire) or unipolar 6-wire winding switched on as bipolar. It enables control with full step or division of step 1/2, 1/4, 1/8, 1/16, as well as 1/5, 1/10, 2/5 forcing a constant value of the current in the winding irrespective of the voltage value of the supply. The direction of rotation is controlled by means of the DIR input. The ENABLE input allows motor operation or de-energizing of the motor.


  • Power levels in modern DirectFET technology
  • Microprocessor and specialized control system TMC239, equipped with a precise control system of current and overload control over the upper and lower links of the power bridge
  • One power supply voltage + 12V .. + 38V
  • High rated current - max 7.5 A per phase
  • Choice of motor winding current: 3… 8 A
  • Step distribution: 1/1, 1/2, 1/4, 1/5, 2/5, 1/8, 1/10, 1/16
  • Frequency of switching of 23 kHz transistors
  • Optoisolated inputs
  • Automatic reduction of current
  • Power supply and control signals on disconnector strips with screw connections
  • The housing is adapted for mounting on a DIN rail
  • LED indicators for power / operation / error

The driver's power level is realized by means of miniature MOSFET transistors in modern DirectFET technology. Minimization of losses and high efficiency of switching the power stage allowed for miniaturization of the controller's size.

The power level of the controller operates at 20kHz switching frequency, and the mixed method of extinguishing the current gives energy savings with an optimal shape of the current waveform, which is related to the precision of the mixed-decay motor motion. The TMC239 control system includes non-linear D / A converters that provide a 1/16 step split, as well as a precise current control and overload control over the top and bottom ends of the power bridge.

Current on phase [A]8
Voltage supply [V]15...75 DC
The maximum division of the step16
Operating mode2 phase bipolar



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