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  • Power Supply problems

    Hi,
    I hope you guys can help me. I have built a power supply based on the MAX787 IC. You can see it here http://www.jarcom.com/inmotion/power.htm

    Now, instead of using a 50uH inductor (which I could not find), I used a 47uH instead (with a 10% tolerance) thinking that this should be ok.

    When I plugged it in with no load it was ok abut when I connected it to the computer, the inductor burned up quite quickly. I tested what current the PC is drawing and it is only about 2.5A or a little less -- this is well within the 5A load limit.

    Do you guys have any idea's before I do get another inductor and try again.

    Thanks a lot,
    c-dawg

  • #2
    what is the amp rating on the inductor? should be atleast 5amps min

    also check for shorts on the board

    Mastero

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    • #3
      Thanks!

      The current for that inductor was < 0.1A !!

      No wonder it turned into fried silcon!

      I have order a 7A inductor but it has to ship to me and it will take a week ok well -- I guess I will have to wait!

      Thanks again,

      C-Dawg

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