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[newbie]hissling sound at inductor

Discussion in 'General Electronics Chat' started by mingyee, Oct 4, 2005.

  1. mingyee

    mingyee New Member

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    Hi, I've this power circuit using a LM2576T Switching regulator to have a 13V o/p. I've attached a copy of the schematic. I wonder the inductor I'm using has this hissling sound. At 1st I used RL1955 & then i changed to RL1952. Both also have the hissling sound. Could anyone help me out with this? thank you.
     

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  2. akg

    akg New Member

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    since this is a switching regulator.. we may suspect the hf current causes core resonance/ magnetostriction that causes the sound ..
     
  3. mingyee

    mingyee New Member

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    mayi know are there any method to resolve this?
     
  4. dave

    Dave New Member

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  5. akg

    akg New Member

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    going thru the datasheet i found the freq to be fixed at 52k , may be ur core has a resonance at this or fundamentals..try changing the core , may use other dimentions/shape..so that the resonance is reduced

    thanks
    akg
     

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