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TPS548D22: FSEL-pin strap configuration

Part Number: TPS548D22

Hello Experts,

I would like to understand RFSEL selection. A below is my understanding.
1. decide fpwm.
2. decide RAMP SELECT option and TIME CONSTANT from the output voltage.
3. decide FCCM or SKIP.

Also if output voltage is 0.9V, which value should select? 22.1Kohm or 16.5Kohm?
[condition]
- fpwm=650KHz
- output voltage=0.9V
- FCCM

Best Regards,
Fujiwara