Hello, I have problem with LM20333 DC-DC. At light loads, it starts oscillating. When load is applied, it starts work well. When load step is applied 1A -> 0A, thjere is 50% chance, it will start oscillating or works without problem. While oscillating, it consumes ~50-70 mA. After startup (poweron) it usually works properly and starts oscillaing randomly (without any external event).
Screenshots taken when Vin=13.2V
Iout (noload) = ~10-20mA
Iout (load) = 1A
DC-DC powered from clean AC/DC source.
Following image shows oscillation at the output (L3 input) when there is no load condition
When 1A load applies, output looks:
And finally, 1A -> 0A step non-oscillations looks:
Schematics (copied from webbench)