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drop voltage of flyback konverter

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pol

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wyh my flyback converter have the 4 % drop voltage?
 

I cant see your circuit.

Please post your circuit
 

Check the output with CRO. The output voltage may be steady 4% dropped or may be oscillating with a ripple peak to peak 8%. If the output is steady 4% dropped then you have to increase the gain of error amp. If the output is oscillating then you have to reduce the gain of the error amp.
 

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