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UCC28180: About SW mosfet rms current of CCM PFC

Part Number: UCC28180

Hello TIer,

I have question about PSDS paper.

as paper mention, may I know the K1, K2, K3 represent which parts factor? there have detail mathematical derivation?

https://www.ti.com/seclit/ml/slup348/slup348.pdf?ts=1658287596211&ref_url=https%253A%252F%252Fwww.ti.com%252Fdesign-resources%252Fseminars%252Fpower-supply-design-seminar-psds%252Fpsds-resources.html