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Discussion in 'Electronic Design' started by Eeyore, Mar 26, 2007.

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  1. Eeyore

    Eeyore Guest

  2. Ken

    Ken Guest

  3. John Fields

    John Fields Guest

  4. flint

    flint Guest

    Opened straight away for me.
  5. john jardine

    john jardine Guest

    Fine for me.
  6. Tom Bruhns

    Tom Bruhns Guest

    I notice that your posting was, apparently, at about 3AM Pacific time
    (Micrometals time zone). It may well have been that their site was
    down for maintenance at that time. Works fine for me now.

  7. ehsjr

    ehsjr Guest

    Works for me.
  8. John  Larkin

    John Larkin Guest

    Looks OK now. Their powdered iron stuff sucks for power apps (tends to
    burn the paint off the cores) but I think they now have a KoolMu
    equivalent that's pretty good.

  9. Rich Grise

    Rich Grise Guest

    Me, too.

    It must have been a temporary glitch, or a scriptkiddie/browser

  10. Eeyore

    Eeyore Guest

    Thanks, it's up again now.

  11. John Larkin wrote:

    "burn the paint off"? Man, what are doing with them? ;-) Doesn't that
    cause permanant damage to the core? I was under the impression that heating
    a core too much could/would lead to permanant changes in the Al value.
    Maybe this only applies to ferrite?
  12. Genome

    Genome Guest

    You don't use output inductors in your buck derived converters. Micrometals
    is just saving bandwidth.

  13. Genome

    Genome Guest

    If you ignore the specific power loss graphs then all powdered iron sucks
    for power apps.

  14. Eeyore

    Eeyore Guest

    It's not buck derived.

  15. Genome

    Genome Guest


    Since you didn't use an output inductor in your buck derived converter it
    blew up so you decided to use a different topology and this one is having
    similar blowing up problems so you are going to use an output inductor with


  16. John Larkin

    John Larkin Guest

    It was a kilowatt polyphase buck switcher, essentially three buck
    switchers in parallel with timings offset 120 degrees. The powdered
    iron toroids fried, even with lots of air flow. I went to permalloy
    powder, expensive but efficient. The CoolMu types are almost as good
    as permalloy for things like this, but a lot cheaper.

    I "invented" the 3-phase switcher in 1985, but I'm fairly sure
    somebody beat me to it.

  17. Eeyore

    Eeyore Guest

    Any expiry of mosfets had zilch to do with the output circuit. If you recall
    there was an 'undocumented feature' of the controller chip.

    Tell me something.....

    Do inverters use output inductors

  18. Eeyore

    Eeyore Guest

    My first experience of using Micrometals powdered iron toroids was in that power
    supply I was working on a couple of years back. They aren't the easiest thing to
    get hold of so I got some from RS components just to try.

    They smoked very nicely. They were only -26 material though. When I got some in
    -2 it was a very different story.

  19. Genome

    Genome Guest

    Go on then....

  20. Eeyore

    Eeyore Guest

    Go on....... what ?

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