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TPS54140A: Current trough inductor used for formula 8 and 9

Part Number: TPS54140A

Hello Can someone tell me which current I can use for formula 8 and 9. Is the inductor current IL  the same as the wanted current out? If I would use formula 12 To calculate the current I need the frequency result from formula 8 and 9. Then it will become a chicken and egg situation.

thank you for the help