TNY278 Stackfet problem

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I have designed 12v,1.8A Smps with StackFet and input range from 100vac to 500vac .The device used is TNY278P in Increased current mode using PIXLS Designer.

The problem is that the Design gives only 3W Power output and the voltage decreases further...If i connect a load of 15 Ohm it should work fine, but it doesn't work.when i connect 15 ohm load the smps goes into hiccup mode.

I have attached the PI XLS design file and Schematic..

please help.. 

첨부 파일Size
GSMST 12V1.8A-ICL.pixls48 KB
Schematic.jpg136.67 KB