60 C - operating temperature

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I have a design ASM-141155. The LNK623 is getting almost 60 Co  fully loaded, it's OK running in this temperature?

Refer to our on line documents, for example RDR-201, transformer winding and output diode temperatures are in the range of 70~80 degC at 90Vac full load (6W). Source pin of PI device is 87 deg C at ambient of 40 degC.

So for your case, it is the system thermal requirement determins the current thermal performance is OK or not. Note the ambient temp and Vac matters for the thermal performance.

Thanks for your reply, but I'm confuse with your answer. Could you explain in another way?

Thanks