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about wrong voltage output of ADP5052

I asked below question. 

https://ez.analog.com/power/f/q-a/546735/wrong-voltage-of-adp5052-s-fb-pins

for this question, I added shematic and sw2 signal form in osciloscope.. according to duty cycle, my voltage of 2. channel should be 12V(input voltage)* 0.27 = 3.3V. but voltage output of Channel 2 is 3.5V. Could you explain that? What can be reason of that? Thank you.



editing
[edited by: gcetinkaya at 8:26 AM (GMT -4) on 5 Jul 2021]