I am using MPQ4560 for a 12V-5V and 12V-3V3 buck converter.
The ringing waveform of the switch node is checked.
I think that the ringing waveform is creating the EMI RE issue at 100~200Mhz.
how to reduce the ringing waveform? how can I resolve our RE issue?
Please make sure you’re following the layout guidelines giving in the datasheet. You can also test this on our EVB and verify if face the same issue since the EVB is optimized for EMI.
If you can additionally add a small bootstrap resistor in series with bootstrap cap to control the ringing.