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I'm using lnk623dg ic for 12V SMPS application. When it is unloaded it is showing 12V output. When I connect the SMPS output to 7805 regulator ic, it is showing 5V at the output and voltage at BP pin is also shown 5V instead of 6V. What and where would be the problem?. We have used rc clamp circuit in the design. Do I need to check?. help me out, please

if I disconnect regulator ic and connect some load externally(resistor), then also SMPS voltage reduces to 5V.

Hello Subash ,

Thank you for interested in using Power Integrations products.

Could you send me your schematic for more detail check. if you have any waveform, that would help more.

best Regards