Hi,
We use the TPS23730 for the POE PD, and the output is 12V/5A;
Now, there are about 50% boards has the howling issue when the power on, and we test the output power is 7W( Normal is 3W) when light load mode;
and we consider it is resonance for the Inductive;
So please kindly review the schematic diagram and advise how to measure the waveform to comfirm which device is the main issue, thanks.