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LM5017 unexplained failure

Other Parts Discussed in Thread: LM5017

I have had some LM5017 regulators fail.

What I found is that they worked fine, then when powered off it would not restart.

I replaced the LM5017 and it powered up perfectly.

There is no physical damage to the LM5017

I did notice that the inductor was warmer than usual after it failed.

 

My setup values for LM5017 are as follows:

Please can you check if there is a configuration problem, or advise why these units have failed.