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TPS54201: 10KHz noise of TPS54201 output .....

Part Number: TPS54201

Dear Sirs,

My customer found their TPS54201 output will have 10KHz noise sound. The sound seem came from inductor or capacitor!

Below is schematics and waveform.

Customer use DC 3.3V for PWM input for test now. 

Can you help to advice which point we can pay attention?

Thanks.