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TPS23756: Audible noise after implementing TPS23756 into our application.

Duncan Law
Prodigy 10 points
Part Number: TPS23756

Hello,

We have implemented TPS23756 into our Wifi access point product which uses POE or external power from 12V to 48V. Whenever voltages is around 24V or 48V using adaptor, the TPS23756 (or its whole circuit including transformer, inductors or caps), there is a very low volume audible ringing occurring when the access point has started up during booting. After booting, around 1 minute, the noise disappeared.

Can anyone suggest what I can try to debug this issue?

Thanks

Duncan

  • 0
    TI__Mastermind 21320 points

    Hello Duncan, 

    Thank you for your question. First, do you know if the DC-DC has started when the noise is occurring?

    Second, can you narrow down the component(s) that are making the noise? For example, the transformer, or the output caps? This will help us narrow down where to look and the potential cause of the problem. 

    Third, can you provide a schematic?

    Lastly, can you speak to the load during the booting period and there after? The DC-DC startup should occur within a second, so I find it interesting that it would make a noise for an entire minute and then go away if it is providing the same level of power throughout the operation.

    Regards,

    Michael Pahl

  • 0 in reply to Michael Pahl
    TI__Expert 5615 points

    Duncan,

    It has been over a week since our last reply. May we consider this thread resolved or do you require more time to gather the information requested by Michael?

    Thanks for your update in advance, 

  • 0 in reply to Thomas Lewis
    TI__Expert 5615 points

    Duncan,

    I am going to close this thread given the lack of activity.

    Please start a new thread if still requiring our assistance.

    Thanks,