Innoswitch Design

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Hello,
I am Nisarg Mehta. I am a Hardware Developer and I want to use Innoswitch3-CE for my 30W AC-DC Power Supply. I am using the PI's online design tool, PI Xls. It is very helpful, still I have some Questions in that design. This tool directly suggests the value of Primary Inductance. Is it possible to know the Formula behind it? How does it calculate? Actually if possible, I would like to know all the possible formulae behind these suggested/calculated values. It would be great if someone could help me regarding this.
Thnak you in advance!!
Kind regards,
Nisarg Mehta