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TPS562207S: Duty-cycle limit

Part Number: TPS562207S

Dear technical support,

I have a design where I would like to use the TPS562207S buck-converter.

The buck-converter is supposed to output 5 Volts and is being driven by a voltage source that can drop to as low as 6 Volts. From the datasheet I understand that the maximum duty-cycle of the IC is 80% with the recommended maximum duty-cycle being 75%. In my case; dropping from 6 Volts to 5 Volts would mean a duty-cycle of roughly 83%.

My question is how the device-behavior changes when the maximum duty-cycle is reached. Would the device be damaged or would the output voltage simply drop to the value that corresponds to the maximum duty-cycle (about 4.8V in this case)? If the IC is not damaged by being used this way, the 200mV voltage drop would be tolerable in my case. 

Thank you in advance and best regards,