The FLT pin of the UCC5710x can report a fault signal to the DSP/MCU when a fault is detected through the DESAT pin, internal TSD, or the UVLO. The FLT pin is pulled down to GND after the fault is detected and is held low until the fault is cleared. It can be pull up to external voltage rail up to VDD level with the considersion that the maximum sink current on the FLT is 20mA. Also a 100pF capacitor between FLT and GND is recommened.