TPS51386 detects overvoltage and undervoltage conditions by monitoring the feedback voltage (VFB). When the feedback voltage becomes higher than 120% of the target voltage, the OVP comparator output goes high and output is discharged after a wait time of 20 us. When the OV fault comparator has been tripped for 256 us, the part latches off. When the overvoltage condition is removed, output remains latched until EN is toggled to low then high, or the power cycling VIN.