Due to the lack of feedback, UCC25800-Q1 transformer driver includes input overvoltage protection to prevent the output voltage from becoming too high, in case its input voltage becomes too high. If the VCC pin voltage exceeds the overvoltage set-point of OV_SD for overvoltage blanking time (OV_BLNK, 1.3 µs typical), the input overvoltage protection is triggered. When the input overvoltage protection is triggered, the fault mode is activated, stops the switching, and discharges the DIS/FLT pin and disables the transformer driver. Before restarting from an OVP fault, the input voltage must be below the OVP recovery threshold OV_RS. The transformer driver attempts to restart after 100 ms as described in Section 8.4.5.

The overvoltage protection threshold is a fixed value and cannot be programmed.