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UCC2800: Maximum PWM duty cycle

Part Number: UCC2800

Hello,

I am using a UCC2800D PWM controller as a buck converter controller in a battery charger; i need accurate information about the maximum allowable duty cycle in order to specify to our customer he minimum difference between the charger input voltage and the battery voltage.

 The graphs reported in the datasheet doesnt specify the maximum duty allowable for every switchin frequency or every Ct, i am using a Ct=220pF switching at 60KHz, how can i calculate my maximum duty cycle?