Over-temperature protection is required, primarily to stop the internal MOSFETs from failing in either high ambient temperature operation conditions or due to self-heating from high switching current. An over-temperature condition occurs when the junction temperature goes above the TSD threshold of 160°C (typical). In this case, the fault mode is activated, the switching stops, discharging the DIS/FLT pin and disabling the UCC25800-Q1 transformer driver. Before restarting from a TSD fault, the junction temperature must be below the overtemperature protection recover threshold (TSD-T_HYST). Over-temperature protection parameters are specified by design.