SLVSD14A June 2017 – June 2020 DRV10983-Q1
The acceleration current limit limits the voltage applied to the motor to prevent the current from exceeding the programmed threshold. The acceleration current limit threshold is configured by writing the SWiLimitThr[3:0] bits to select ILIMIT. The acceleration 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 applied to the motor, U, as shown in Figure 32 and Equation 8.
When the acceleration current limit is active, it does not stop the motor from spinning nor does it trigger a fault. The functionality of the acceleration current limit is only available in closed-loop control.