Current Increasing inside housing - lnk420

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I'm developing 50W  (23V, 2.1A) led driver using LNK420. Design worked perfectly when tested outside housing. But when I put my driver on metal housing base, current jumps to 2.5A.

I am attaching the images of the problem I'm facing. Housing is flood light housing designed for 50W.


Pls review the layout of theboard especially the V-pin of the IC. A noise injected on this pin could result on output power variation.