Dear sir, We have built a 60V/1A( 60W) LED CC driver using LNK420. based on PI Expert. We have built the transformer using the PQ3220 Core. The Output is not coming upto 1A.It is around .78A/64V. Also the THD is around 25%.Please suggest ways to fine tune and get the full current of 1A.
Also ways to reduce THD to less than 15%. I have seen some circuits employing a RC input from the Tank Capacitor into the feed back PIN on LNK.We dont seem to have seen any such recommendation in PIliterature on LNK-PH family of ICs though! Please throw some light on this and suggest ways to improve THD and Power Factor without losing the Output current regulation.