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TPS55340-Q1: How the equation 40 comes out

Part Number: TPS55340-Q1

Hi team,

May i get your help to confirm how the equation 40 comes out on the datasheet of TPS55340-Q1(page 22), is there has any formula deduction for this equation? 

Could you please kindly help to share some material which could show the deduction process? 

Thank you very much for your help.

Best regards

Jessica