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  • TI Thinks Resolved

LM5116WG: L1( Inductor) at the Vout gets hot

  • Do you have schematic or layout?
    How hot is the inductor and how much current

    Thanks
    -Arief
  • In reply to Arief Hernadi:

    8507.Power supply-TI_E2E.pdf1663.SIM_85V_1.5A.pdf3730.SIM_85V_2A.pdf8510.SIM_85V_2A_airFlow.pdfhi, L3 in my schematic gets hot, which is L1 in the datasheet of LM5116WG

  • In reply to Muthu Venkat:

    hi

  • In reply to Arief Hernadi:

    hi

  • In reply to Arief Hernadi:

    I have attached the files.pls take a look
  • In reply to Muthu Venkat:

    Hi,

    What is your inductor temperature? Also what is your VIN when the inductor gets hot. 

    It could be that you have a lot of ripple. do you have a scope capture of the inductor current waveform?

    Thanks

    -Arief

  • In reply to Arief Hernadi:

    Our customer complaint about this.It s hot like they can't touch it.The the device we use has this power supply which is in the plastic enclosure. we thought of adding thermal compound to this inductor.

    Then we started  having voltge fluctuation too. All the details you asked is in the simulation result we provided. Test boards we have in the lab has 11.2V as Vin.  If it is ripple then how can we resolve this ?

  • In reply to Muthu Venkat:

    If it is ripple current, you can try a larger value of inductor such as 15uH and 22uH and see if that improves it.
    When you say voltage fluctuation is it at the output? If yes, then it might be that your design is unstable. If you have a layout file we can take a look if there is any sensitive node that might be injected with noise

    Thanks
    -Arief
  • In reply to Arief Hernadi:

    I'll try with larger value of L.

    Sorry not fluctuating, We are getting different o/p voltage in different board like some boards 8.9 V , some boards 10.3 V .

    what if the Inductor gets saturated? Can you please take a look at our schematic which I sent to you and let us know.
    Tomorrow I will send the layout.

    Thanks
  • In reply to Arief Hernadi:

    do u have any particular part # for 15uH or 22 uH

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