less efficiency in non dimmable configutation

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Sir,

    we made a 10w dimmable led driver with the help[ of rdr193. We used lnk405 switch and the driver is working absolutely fine with 80% efficiency. We followed the same transformer construction as in the rdr193. Using the same transformer we tried a non dimmable driver but the efficiency is 76% only! For non dimmable driver we used lnk415 IC and we removed dimming circuitry from rdr193 circuit. Why it is showing less efficiency compared to dimmable driver (even with same transformer). Please guide us to improve the efficiency

Thanks

Stalin DM

If you remove theactive damper (remove all active damper components make sure to shortR16, and remove passive bleeder components r14 and C9, the efficiency should increase. Did you short R16?