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TGhau.2088
TGhau.2088
Associate II
November 14, 2019
Question

I have a board from arrow called avenger96 that uses a STM32MP157ACCx, it is making a odd buzzing sound when i power it up which i can not explain.

  • November 14, 2019
  • 3 replies
  • 857 views

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3 replies

PatrickF
PatrickF
Technical Moderator
November 14, 2019

Hello, please check this issue with Arrow. Usually linked to SMPS inductors. Noise could disappear when power load increase.

Not linked to STM32MP15 component.

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Tesla DeLorean
Tesla DeLorean
Guru
November 14, 2019

I don't have the board, but in general some switching supplies will whistle / squeal at the edge of the hearing range, the pitch / presence can change with loading, or lack of it.​

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Martin Devera
Martin Devera
Associate III
November 14, 2019

Also it is very often MLCC capacitor. There is simple test, take srewdriver and touch (don't short!) ceramit part of capacitors and inductors. When spotting correct one, the sound will change. MLCCs with class 2 dielectrics are quite a lot microphonics.

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