LNK500 Start up

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Hello,

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?

Regards,
Ricardo