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LM48511: LM48511SQBD/NOPB Development Board

LEO IODICE
Prodigy 30 points
Part Number: LM48511

Support Path: /Reference designs/Technical support help for a specific technical issue with a reference design/

We are developing a product for the LM48511 using the LM48511SQBD/NOPB development board.  Its working but the output also has a large high frequency signal. See attached. Its that correct? How can it be suppressed?

  • 0
    TI__Mastermind 20085 points
    Hello Leo,

    Could you provide me a schematic? In order to support you in better way.

    Best Regards
    José Luis Figueroa
    Audio applications Engineer
  • 0
    Prodigy 30 points
    Any thoughts on my problem?  I built up a circuit from scratch based on the development board schematic and I get the same results.  I’m concerned that much noise will reduce the output power but I can’t measure the audio signal because the noise overwhelms it.  

    Best regards,

    Leo Iodice
    Chief Technology Officer
     


     
    Black Diamond Solutions, Inc.
    Office/Cell: (508) 259-4158
    email: Leo@BDS.us
    web:  www.BDS.us
     



  • 0 in reply to LEO IODICE
    TI__Mastermind 20085 points

    Hi Leo,

    That could be caused by a decoupling issue in order to avoid it, you should use the decoupling capacitors and place as close as possible the device.
    Another possible cause could be a bad selection of the inductor, you should choose an inductor with a saturation current rating greater than the maximum operating peak current.
    I hope that this helps you.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer