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Thread: Power Supply problems

  1. 05-22-2002, 06:00 PM #1
    c-dawg
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    Angry 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
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  2. 05-23-2002, 03:51 AM #2
    Mastero
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    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. 05-23-2002, 11:15 PM #3
    c-dawg
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    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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