saurav_sdpl
Full Member level 3
, I have designed a flyback smps for 4.2V/2A.using TNY268.
Underno-load condition its working fine between 100V ac to 250V ac.
but when i am giving .5A load the voltage dips to 2.9V, ie i am not able to achieve regulation.
I have used 3.3V /.5W zener. biasing resistance for zener is 270r, and opto used is SFH6186.
Wat could be the possible causes for this.
its urgent
Underno-load condition its working fine between 100V ac to 250V ac.
but when i am giving .5A load the voltage dips to 2.9V, ie i am not able to achieve regulation.
I have used 3.3V /.5W zener. biasing resistance for zener is 270r, and opto used is SFH6186.
Wat could be the possible causes for this.
its urgent