18W LED Driver using LNK417

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Hi,

I had designed one 18W LED driver with output 39.6V@450mA.But whileconnecting load i was getting only 36V@320mA.Can anyone help to get the desired output.I am attaching the schematic of the driver.All deviations in component value is marked in red colour.

Please help to solve this problem.

 

Thanks and regards

sivaprasad

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18W driver schematic98.34 KB

Hi,

Please reduce the value of R10 until you get the desired current. I estimate the value to be around 89k, so you may want to start there.

If you used PIXLS on your design, it actually calculates the required FB resistor. Perhaps the actual bias voltage is lower than the spreadsheet value, which results to lower FB current.