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Output Voltage Ripple of TPS544c20

Hi,

I have a question on the output voltage ripple of TPS544c20EVM-634.

The following figure is from "Using the TPS544C20EVM-364, TPS544B20EVM-364, PWR-364 (Rev. A) " (SLUUAY7A). 

What is the root case of the voltage platform in red cycle? How to merge or reduce it?

Thanks.

Best Regards,

Jason Liu