LNK606 is not workin for 6 W

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I am trying to make 6W led driver using LNK606 ( online driver) as i have attached circuit diagram . As given in DER215 that it is working for 8.4 Watt.
I have used EE13 Primary turns 150 and secondary turns 62.
Output=18 V
I have applied resistance of 65 ohm at this circuit,it run for only 5 minutes and after that output voltage start to decrese . Please guide me for 6 Watt.

I can not see your attached circuit diagram, and I need to know your input voltage range to check your design.

By the way, are you using a resistor for the output load?

Either an actual LED or a simulated one should be used for the LED driver load.