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LM5009: Frequency variation

Part Number: LM5009

Hi

Our customer uses LM5009 on their application. They found a sample that the frequency is 7kHz. (The setting frequency is  30kHz.)

Does this device has such a large variation of frequency at continuous conduction mode if all external condition is same? (Is this normal variation?)

According to datasheet, Ton is defined as bellow.

So,I think the variation of frequency is similar as the variation of Ton if the all condition(Vin, Vout , Iout, the external components) is same.

Is my understanding correct?

Best Regards,

Koji Hamamoto