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TPS62130A-Q1: frequency setting and result

Part Number: TPS62130A-Q1

I setting the switching frequency as 2.5MHz.

but why in my measurement the maximum switching frquency only 1.56MHz.

for variable switching frequency, how can I calculate the indutance?

my condition:

Vin=8V, Vout=1.09V, Iout=2.6A.