JAJSJT8C May 2020 – June 2021 TPS543620
The device incorporates both output overvoltage and undervoltage protection. If an overvoltage is detected, the device tries to discharge the output voltage to a safe level before attempting to restart. When the overvoltage threshold is exceeded, the low-side MOSFET is turned on until the low-side negative overcurrent threshold is reached. At this point, the high-side MOSFET is turned on until the inductor current reaches zero. Then, the low-side MOSFET is turned back on until the low-side negative overcurrent threshold is reached. This process repeats until the output voltage falls back into the PGOOD window. Once this happens, the device restarts and goes through a soft start cycle. The device does not wait the hiccup time before restarting.
When an undervoltage condition is detected, the device will enter hiccup where it waits seven soft-start cycles before restarting. Undervoltage protection is enabled after soft start is complete.