Tny287 regulations issue

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I have designed power supply using tny287 for 7v/2.5a
I have proper regulation till 7v/0.7 a.
Further increasing the load my tny switch loses regulations an it continuosly tries to maintain output voltage but fails.
My only component TVS P6KE is too hot .
Can u please suggest some solution .

I have been through other forum posted on this site.
Tried some solution with RCD+ zener clamp.
Still have not achieved desired goal

Hi,

Thank you for considering Power Integrations for your solution.
Can you please share your schematic and PCB documentation that you are using? Can you kindly also share your Transformer documentation such as the one got from the PI Expert Tool on our website?

Best Regards,
PI-Kryten

i suggest connection 2 p6ke diode in series

Hi,

Cross-checking your spreadsheet parametres with your transformer details could help

Best Regards,
PI-Kryten