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WEBENCH® Tools/TPS562208: Calculated duty cycle exceeds limit for 4.8V Vin, 3.3V Vout.

Part Number: TPS562208

Tool/software: WEBENCH® Design Tools


Why is "Calculated duty cycle exceeds limit" occurred?  On Input:4.9V-5.2V, Output:3.3V at 2A case, there is no error on Webench.  However, input min voltage set 4.8V, "Calculated duty cycle exceeds limit" error is occurred.  Please let me know the reason.

TPS562208 datasheet P.17 said "the minimum recommended input voltage is VO / 0.75".  If VO=3.3V, min recommended input voltage is 4.4V. I seem it is no issue. That is why I am asking.

Thanks and best regards,