MP46885 Frequncey and Inductor Choice

DC-DC Power Converters
1

I’m confused about the calculation for the inductor selection and switching frequncey for the MP46885.

The datasheet says:
Capture

If I use:
Vin = 52V
Vout= 25V
L0= 47uH
I_LED = .1A

Wolfram Calculation:

This calculation gives me a 16.2MHz switching frequncey. What am I going wrong? The max switching frew is 2MHz but these values are almost identical to those used on the eval board (same inductor value and Vin and Vout are pretty close):
https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/EV46885DN-00A/document_id/3136/

2

Fat fingers?
If Vin is 52 and Vout is 25V then the duty cycle is Vout/Vin or 48%
The average LED current is 1A the peak is 1.15, and the valley is .85A
That means during the ON time the current increases by 300mA
The inductor value is 47uH

So what is the ON time for a 300MA increase in current in a 47uH inductor with 27 volts across it?
V=L di/dt 27= 47e-6 .3/dt dt is 522 nsec

So I get an on time of 522 nsec ( 48% DC) so the off time is a little bit longer at 565 nsec
The total period is 1087nsec which is a frequency of 920khz.