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Luxeon emitters

Discussion in 'Electronic Design' started by R.Lewis, Jan 18, 2005.

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  1. R.Lewis

    R.Lewis Guest

    Once upon a time the heatsinking 'slug' on the Luxeon emitters was not
    electrically isolated from somewhere/something dark and secret within its
    'innards and the datasheet/appnotes informed of this fact - detailing that
    the slugs must be electrically isolated from each other .

    Recently I have noticed that the slugs appear to be electrically isolated
    from the anode and cathode connections although I can find no Lumileds
    reference to this fact.

    Anyone know anything about this?

    Regards.
     
  2. Leon Sorokin

    Leon Sorokin Guest

    i pulled an blue High Dome emitter off the star base just yesterday. I did a
    continuity test and it seems to be isolated from both. i havent cleaned the
    slug yet from the epoxy that held it on though. but i'm pretty confident of
    the fact.

    Leon
     
  3. I have noticed that some Luxeons have isolated heatsinking and some do
    not. If the datasheet does not say anything in this area about a
    particular part number, assume that the manufacturer reserves the right to
    change that characteristic of that part number and be prepared for the
    worst.

    - Don Klipstein ()
     
  4. Zak

    Zak Guest

    There may be different production lines or an old batch may appear on
    the market, indeed.


    Thomas
     
  5. Ian Stirling

    Ian Stirling Guest

    Posted this before, it does not seem to havge appeared.

    The LED chip is glued onto the copper slug.
    If they change from conductive-non-conductive glue, or the chip sits slightly
    skew, with one corner touching the mount through the glue, it could be
    conductive.
     
  6. LEDlights

    LEDlights Guest

    The slug is electrically connected to the substrate comprising 2
    inverse series zener diodes, this explains why you cannot measure with
    an ohm meter. See the Lumileds document RD25.pdf
    http://www.lumileds.com/pdfs/RD25.PDF

    Each zener may be in the range of 5v - 10v so it will not usually show
    a problem in low voltage applications.

    Pat
     
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