The UCC5714x implements a fast over current protection feature to protect the MOSFET/IGBT from catastrophic breakdown during a fault throught the OCP pin. The voltage at OCP pin sensed the negative voltage drop across the system sense resistor. The pin can handle up to -10V negative DC voltage. The relationship for input, output and enable can be found in OC Protection Timing Diagram shows the typical operating conditions for the OC protection. The device features an internal leading edge blanking time t_OCLEB that is actived at eaching raising edge of the input. During the t_OCLEB, the driver will disable over current fault detection. For noisy systems, additional RC filter is recommended to avoid the false fault report. After the device exits t_OCLEB and the OCP pin voltage is above V_OCTH, the OUT will go low after t_OC2OUT and the EN/FLT will be pulled down. Once the OCP pin voltage goes above V_OCTL, the EN/FLT will be pulled up and the OUT will stay low until the next input raising edge.

Figure 6-3 OC Protection Timing Diagram