TPS548A20: TPS548A20 max duty cycle

In the webpage for TPS548A20:www.ti.com/.../TPS548A20, the duty cycle (Max) is 50%. However, I couldn't find any info in the datasheet confirming this limitation. Is this duty cycle limit for a particular range of selected PWM freqeuncies or true for all selection of PWM frequencies? Can anybody in TI clarify this? Thank you.