SLUSCD4B March 2017 – May 2018 TPS543C20
The device includes both output overvoltage protection and output undervoltage protection capability. The devices compare the RSP pin voltage to internal selectable pre-set voltages. If the RSP voltage with respect to RSN voltage rises above the output overvoltage protection threshold, the device terminates normal switching and turns on the low-side MOSFET to discharge the output capacitor and prevent further increases in the output voltage. Then the device enters continuous restart hiccup.
If the RSP pin voltage falls below the undervoltage protection level, after soft-start has completed, the device terminates normal switching and forces both the high-side and low-side MOSFETs off, then enters hiccup time-out delay prior to restart.