Protection/Safety function of the LNK574.

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Dear Sir,

We are examining the DER-258 circuit by safety standard test.
We want to confirm the operation of the heating protection
function of the LNK574.
When short circuit of output or open loop of feedback, the
LNK574 will stop switching.
The overloaded status is not gotten in this application.
What test is effective in confirming the operation of the heating
protection function ?
Isn't there possibility that the heating protection function
of the LNK574 doesn't operate ?

Best regards,