Description

The SD215 driver includes an on board switching voltage regulator, a 20 khz chopping rate, optically isolated inputs, an automatic current reduction function, and a power LED power indicator. The on board jumpers select Full & Half step modes. The on board potentiometer provides the running current setting.

Function Description

The SD215, a high performance stepping motor driver, is intended to drive a bipolar constant current through the motor windings. The driver receives step and direction signals from the system controller and generates the phase sequences according to the drive mode setting . The motors running current is adjusted by adjusting the on board potentiometer, VR. Turning the potentiometer VR clockwise will increase the running current up to 1.2 A, and turning VR counter clockwise will decrease the running current down to 0.2 A. The current reduction ratio is fixed at about 50% of the running current. The current reduction will occur after the pulse signal becomes idle for more than 100 ms. The reference voltage input provides a precise way to set the motor winding current. A resistor linked between the Vref and GND terminals will determine the current value of the motor windings. In this case, set VR to the maximum value ( turn VR all the way in clockwise).

Specifications