Voltlog #72 - DIY AC-DC Off-Line Converter With TNY276/TNY277 - part 1

This is the first AC-DC power supply that I’m designing and building. Everything seems to work up to a point where the chip gets too hot and enters thermal protection. This is where I’m asking my viewers help to jump in with suggestions on what might be wrong. Link to part 2 of this story TNY276 datasheet Transformer ER2741 datasheet PI Expert suite Schematic PCB Carbide Drill Bit Set