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LM25145: Oscillator Frequency tolerance for calculating duty Dmax

Part Number: LM25145

Hi Team,

My customer would like to check max duty(min) in their system. We know Dmax = (Tsw - toff-min)/Tsw.

What is the tolerance of Fsw if we set the Fsw(typical) =300kHz?

Additional information as below:

VIN=20V (+5%), 

VOUT=14V (-5%)

RT: 33.2k ohm = 300kHz

Min off time: 200ns

Fsw tolerance: ??

Best regards,