I have design LED Driver using above said IC, it is powering up but i cant set current up to 0.75mA @ 12.8V input i have connected 3 white LED in series & 6 in parallel, i required 9 Watt output from driver. As per design reference i have selected component, Driver is working but current not increase more than 200mA current is sating but immediately LED starts flickering. Please guide.