Schematic diagram and PCB refer to the attachment。there are three questions in using UCC28019。
1、The MOS-FET switch instantly produces a high voltage pulse, which causes the MOS-FET breakdown when the input condition is unstable；
2、The MOS-FET switch generates an irregular pulse of current and causes the PWM loss；
3、The Energy-storage inductive noise is very large，the sound can be heard。
The attachment Files can beopened by PDF、Altium Designer。
