LNK604DG LED DRIVER PROBLEM

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DEAR SIR, I AM TESTING MY NEW DESIGN USING LNK-II FAMILY IC LNK604DG AS PER YOUR STANDARD DESIGN. I HAVE KEPT ALL VALUES MENTIONED IN DESIGN NOTE. TRANSFORMER IS ALSO AS PER SPECIFICATIONS.MY DESIGN IS 10.5 VOLT-350mA LED DRIEVER. BUT ON TESTING CIRCUIT IS FUNCTIONING BUT IT IS TAKING ONLY 200mA LOAD @ 9.0 VOLT. ALSO ON NO LOAD CONDITION O/P VOLTAGE BECOMES UNREGULATED AND SHOOTS ABOVE 35 V DC ALTHOUGH IT SHOULD REGULATE TO AT AROUND 12V. I HAVE USED LNK604DG INDTEAD OF LNK605DG AS IT IS NOT AVAILABLE RIGHT NOW WITH ME.

PLEASE TELL ME WHERE I AM GOING WRONG.

RAJESH BHTKAR. NASHIK-MAHARASHTRA INDIA. 

 

E-MAILID-rajeshbhutkar@hotmail.com 

Please specify which sample design you base your project. Please attach your schematic and transformer spec as well in order for us to analyze where the problem is.