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Inductor selection of LT8390A


I have 2 questions about inductor selection of LT8390A
The data sheet shows a formula for calculating the minimum inductance but when I calculated Lbuck with the specifications of the evaluation board, it was 2.85uH.
it seems that there is a gap between calculated value and evaluation board.

1) Why do you use 1uH with this evaluation board?
2) How should I calculate and select inductor value?


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