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UCC28881EVM-680: When loading 0-130ma with TI UCC28881 EVM(UCC28881EVM-680), the board makes a harsh sound.How to solve this issue? Thanks!

Part Number: UCC28881EVM-680
Other Parts Discussed in Thread: UCC28881

Dear Sirs,

When loading 0-130ma with TI UCC28881 EVM (UCC28881EVM-680), the board makes a harsh sound.How to solve this issue? Thanks!

  • Hello user4359409,

    Thank you for your interest in the UCC28881 and its EVM. The sound that you hear is normal for this type of ripple regulator, since it is switching in the audible frequency range at medium loads. Section 10.5 of the EVM User Guide (ref: www.ti.com/.../sluubb6a.pdf ) addresses this issue.

    Depending on the application, the noise may or may not be objectionable. If it is, there are some techniques that can be applied that can reduce or even possibly eliminate the noise. Refer to this app-note on the subject: www.ti.com/.../slua821.pdf

    Regards,
    Ulrich