We have built up several iterations of the 500 mA /28V LED driver design using the LNK 406 as per RDR194.
The non dimming units perform extremely well, our problem is with the triac dimming unit, the dimming range is very poor. At max output we are getting exactly 500mA but when fully dimmed we are still getting 109mA which still represents quite a bright light.
Where do we start looking? Once it is possible to dim down lower, will the unit restart from a very low dimmed point? a factor that is important in marketing.