LTM8046 input voltage range vs output voltage

Hello,

I want to convert 28V input to 5V,450mA isolated output by using LTM8046 . In datasheet, says LTM8046 maximum input is 31V .  However, DC1559A demo board specifies input range maximum 26V, also in datasheet circuits.

Is the input maximum voltage depends the output voltage?

Is 31V input only for the output below 3.3V?

Regards,

Mehmet.

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