Does anyone know what causes this waveform at the switching node of a buck?
This was configured for 12V in 5V out . It uses a 10uH inductor. The load was 100 ohms.
I see a typical hysteretic mode when I remove the load:
When I zoom in in the switching edges, I see something similar to that "oscillation"-like waveform.
It looks like the transistor turns on partially, which can't be good.
If I increase the load to 50 ohms, the switching node looks normal.