Feedback loop calculation for offline Flyback SMPS

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eem2am

Joined Jul 22, 2012
13
The FSDMxxxx series of flyback controllers, and the FSCQxxxx series of QR Flyback controllers, have an effective feedback loop primary side pullup resistor of value 2.8k.
..Considering the FAN6300 QR Flyback controller, would you agree that its “equivalent” pullup resistor value is 5k?
The FAN6300 datasheet and App note (below) don’t say.

FSCQxxxx datasheet:
https://www.onsemi.com/pdf/datasheet/fscq1565rt-d.pdf

FSDMxxxx datasheet:
https://www.onsemi.com/pdf/datasheet/fsdm0465rb-d.pdf

FAN6300 datasheet
https://www.onsemi.com/pdf/datasheet/fan6300-d.pdf

FSCQxxxx series App Note:
https://www.onsemi.cn/pub/Collateral/AN-4146CN.pdf

FSDMxxxx series App Note:
http://educypedia.karadimov.info/library/AN-4137.pdf

FAN6300 App Note:
https://www.onsemi.com/pub/collateral/an-6300.pdf
 
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