I designed a power supply using LNK500.
Usually when I connect the power supply to the mains it starts up normally. But sometimes when I connect it to the mains it just does not start up. If I leave a power supply (which did not start up) connected to the mains, after some minutes it starts up.
Sometimes I have to disconnect and connect again the power supply to the mains to start up it properly.
Do you have any clue of what is going on?