Texas Instruments TPS54373EVM-237, User Manual, Page: 14 / 36

Modifications
1-6
Warning
Under no circumstances can the output voltage be allowed to
precharge to a level higher than the preset output voltage. If this
condition occurs during start-up, the TPS54373 device does not
begin switching.
If a voltage transient on the precharge voltage source causes the series diodes
to conduct, current may be sunk through the low side FET in the device,
possibly damaging the device. The actual voltage drop across the diodes
during start-up depends on the initial load condition of the circuit as well as the
ambient temperature.
An onboard electrolytic input capacitor may be added at C1.