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Original question:

TPS65218: Humming Noise Sound in PMIC

TPS65218D0: Humming Noise Problem

Utku Uygun
Prodigy 155 points
Part Number: TPS65218D0
Other Parts Discussed in Thread: AM4378,

Hi,

In the custom board we designed based on AM4378 SoC and TPS65218D0 PMIC, a high-pitched hum/buzz comes from the PMIC area. We turned off the PFM feature by correcting the PMIC registers, but the situation is still the same. What other fixes can we get rid of this issue? 

  • 0
    TI__Mastermind 19816 points

    Hi Utku,

    Thanks for reaching out. I will need more information to assist on this issue. Could you please provide the information listed below:

    - schematic and layout so I can review the connections and routing.

    - captures of all the DCDC input supplies, the Lx nodes and output voltages. Please include transient and steady state. 

     

    Thanks,

    Brenda