The UCC28781-Q1 operates with cycle-by-cycle primary-peak current control. The normal operating range of the CS pin threshold is between V_CST(MIN) and V_CST(MAX). If the voltage on CS exceeds the 1.2-V over-current level at any instant after the internal leading edge blanking time (t_CSLEB) and before the end of the transformer demagnetization, for three consecutive PWML cycles, the device stops switching, RUN pin goes low, and the OCP fault response is triggered. Similar to OVP, OPP, and SCP, only the UVLO-cycle of VDD is active and there are no test PWML pulses at all. For auto-recovery, when V_VDD reaches the next V_DD(OFF) after the 1.5-s time-out is completed a normal start sequence begins.