ZHCSH31B August 2017 – February 2018 DRV10987
The software current limit limits the voltage applied to the motor to prevent the current from exceeding the programmed threshold. The software current limit threshold is configured by writing the SWiLimitThr[3:0] bits to select ILIMIT. The software current limit does not use a direct measurement of current. It uses the programmed motor phase resistance, RPH_CT, and programmed BEMF constant (Kt) to limit the voltage, VU, applied to the motor as shown in Figure 32 and Equation 8.
When the software current limit is active, it does not stop the motor from spinning nor does it trigger a fault. The functionality of the software current limit is only available in closed-loop control.