Hi All
I have made one PCB to get AC110~220V to DC5V/100mA by using UCC28880 High side mode.
But there has very annoying audible noise, I've checked L2 switch side, is it any problem here?
Reducing the inductor value doesn't work. Even I tested UCC28880EVM-616 (TI developed board), it's same problem....
Can anyone help, plz?
Here is my schematic: