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TPS564201: frequency at no load

Part Number: TPS564201

Tool/software:

Hi Team,

Is there a limit to how low the switching frequency will go at no-load? Waveform in the datasheet indicates about 55kHz but customer is seeing 136Hz when looking at Vout ripple. 

I've asked to look at the SW node and Vin to see if there is another low frequency ripple on the board dominating the Vout ripple waveform. 

Thank you, 

Trent