Voltage measurement from feedback pin

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I am designing a sensor using a lnk 304 in buck mode as power supply. I need to measure the input voltage (110/220) and i was thinking about using the control function of the lnk to measure the input voltage. Is there any way to access the duty cycle of the lnk without modifiying its performance ?







What do you refer to as the 'control function'?

There is no direct way to access the duty cycle output by the controller.