We made a 15w (24v/0.7a) dimmable highly accurate ISOLATED led driver using lnk406 with the guidance of DER296 and PI forum. It is working fine but efficiency is low as 76% due to the series resistance drop. We need a Dimmable highly accurate constant current driver with efficiency >80%. Shall we follow DER289 for achieving our goals? Is there any drawback with DER289?(currently it is not available in the design examples list ). If I add dimmer and bleeder and change the device to 407, let me know whether DER289 will work as a dimmable driver. Please guide me to make a dimmable highly accurate CC driver with efficiency >80%. Also I would like to know what are the changes need to add in rdr195(90-265v input) to make it 90v-277v input design.