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LMR23615: audible noise at output side under light load condition

Yue TANG
Expert 8615 points
Part Number: LMR23615

Hi,

My customer is evaluating LMR23615, they found there is a audible noise at output side under light load condition .schematic is as below. I understood that this device support PFM, the output ripple will become bigger.  please suggest how to eliminate this audible noise? thanks. 

input : 5.9v-20v

output 5V 0.8A