TPS548D22 supports latch-off mode or hiccup mode when an OVP or UVP event are triggered. Normally when an OVP event occurs, the output discharge could lead to an undervoltage condition and trigger an UVP event. Then the OVP event will be reset by the UVP event. When an OCP event occurs, it results in the output voltage falling which causes the UVP event.

For latch-off mode, the device will shut down if an OVP or UVP event occurs. It will restart again only if the EN pin is toggled or the VDD pin is power cycled. For hiccup mode, the device will restart after a hiccup delay when OVP or UVP are triggered. The hiccup blanking time depends on the soft-start ramp time setting. For a typical 1-ms soft-start, the hiccup blanking time is 16 ms. During the hiccup blanking time, the soft-start logic takes 1 ms to gradually increase the reference voltage from zero to the target level.