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SMPS feedback voltage filtering

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eem2am

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hello,

I just did flyback PFC with L6561 and app note AN1059...

iNPUT = 240V ac and OUput = 12V

datasheet:
https://www.st.com/stonline/books/pdf/docs/5109.pdf

AN1059:
https://datasheet.digchip.com/000/000-1-AN1059.pdf

My circuit as like fig 16, page 17 of AN1059

Anyway, i have ripple on output of 1 volt pk pk.

The average output was just below the required 12Volt,......so i put a 22nF cap across the lower feedback divider resistor and it was then risen OK to 12 Volt.

Is this bad?

I hear it is bad to put cap in parallel with the lower feedback divider resistor?

The load is constant load ...just LEDs
 

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