LM3404: Error in the documentation

hello Massimo

I've double checked the formula, and this should be right. Pls see my derivation below:

first of all, based on buck topology, the output voltage should be Vo=Vin* D=Vin*ton/Tsw=Vin*ton*fsw.

based on Equation 1, ton=1.34*10^-10*Ron/Vin, we substitute this into formula above and rearrange to get Ron=Vo/(1.34*10^-10*fsw).

Regards

Yes please, I found that a faulty component brought me on the wrong way. Thank you for your attention.