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Guess This Graph

Discussion in 'Electronic Design' started by Tim Williams, Dec 31, 2012.

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  1. Tim Williams

    Tim Williams Guest

    It's time for another round of:

    Guess This Graph!

    See the following datasheet:
    (apparently they don't have shorter links; part is IDH04G65C5XKSA1)
    Bottom right page 6, forward characteristics (surge).

    The region below 3V is clearly the stuff magnified to the left, but what
    the hell is the linear region about (>3.8V @ 175C, >5.4V @ -55C)?

  2. RipeCrisbies

    RipeCrisbies Guest

  3. Fred Abse

    Fred Abse Guest

    Interesting characteristic. The divergence above about 32.5A is
    interesting, too.

    Needless to say, the Infineon Spice model doesn't reflect this behavior.

    I guess I shall have to buy one and CT it.
  4. Robert Baer

    Robert Baer Guest

    Am guessing that is the resistivity of the bulk (doped) silicon.
  5. Tim Williams

    Tim Williams Guest

    But isn't that the normal stuff under 8A, with a typical positive tempco?
    What about the re-bunching? It's just.... weird!!

  6. Rocky

    Rocky Guest

  7. Tim Williams

    Tim Williams Guest

    That's nothing new -- big power schottkies will do 30nF at zero bias down
    to a few nF at rated voltage. They tend to stink as varactors though.
    That said, SiC may have lower dielectric loss!

  8. Tim Williams

    Tim Williams Guest

    Infineon replied!

    Apparently, it's due to P-N junctions kicking in, perhaps guard ring stuff or something like that. Suffice it to say, an SiC schottky isn't a crystal with a layer of metal glued to it, they do more work to them than that.

    They also gave me a reference:
    Heinze/Neumeister/Rupp: Surge Current Ruggedness of Silicon Carbide Schottky- and Merged-PiN-Schottky Diodes, ISPSD 2008

    So if you're still curious, and have access to IEEE,
    you can get some more answers.

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