Flickering problem LNK417

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Hello,

We have a problem with an  LNK417 led drive.

When it is tested normally It works good, but when we pot the device in pu resin, some of the outputs start flickering (1.5sec on, 1.5sec off, 1.5sec on, 1.5 ....). 

In an datasheet we found that there should be placed a 100nF cap between  V and source. This solves the problem for a big part, but some outputs keep flickering.

 

What can we do to solve this?

 

Thanks,

Stijn

It sounds like there might be some layout issue with your board.

It is important to follow layout guideline in the datasheet to keep Vpin

from getting the switching noise.