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optical DC/DC step-up converter

Discussion in 'Electronic Design' started by Thomas Magma, Nov 20, 2010.

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  1. Thomas Magma

    Thomas Magma Guest

    Many years ago I saw an IC that directly converted low voltage DC to higher
    voltage DC using internal LEDs (no switcher). The theory was that a single
    LED would shine on a series of LEDs to produce a higher voltage. It was only
    micropower stuff, but I might have a use for it if I could find it again.

    Does this ring a bell to anyone?

  2. Joerg

    Joerg Guest

    It does ring a bell but it's been a long time ago and the idea seemed to
    have vanished quickly, as expected. To me it appeared to be "technology
    looking for a home".

    You can build your own but don't expect any efficiency. Why not use an
    oscillator and inductors? If it has to be more stealthy maybe use
    ultrasound and PZT ceramics.
  3. Joerg

    Joerg Guest

    Cool! Avnet has 750 of them, the others seem to be all dry.

    At over a buck a pop I'd be partial to using a Chinese-made ferrite-core
    transformer plus rectifier to get DC up there. At least as long as the
    Renminbi is pegged against the Dollar :)
  4. Joerg

    Joerg Guest

    FPGA, uC or DSP pin. As in "free" :)

    30-40c a pop in reel qties. <25c if it's a huge series.

    Ok, another 3c.

    Un pequena condensador de ceramico. 0.3c, if you want to splurge and use
    X7R. Otherwise more like 0.2c. Seriously, you can get 10,000 of them for
    $20 at Digikey and they've got over 10 million in stock.

    True. Doesn't matter too much but if production has to be domestic with
    the high placement cost you are right. You'd probably still save with
    the discrete solution, but not much. In Asia, different thing. I have
    done designs that are in production there, where some people would scoff
    of crack jokes about how the world now has ICs and all that. Yet even
    after years in production there is no way to achieve the same unit price
    through higher integration.
  5. Am 20.11.2010 03:24, schrieb John Larkin:
    Panasonic APV1121, APV1122, APV2111, APV 2121
    max 8.7V, max. 14uA

  6. Thomas Magma

    Thomas Magma Guest

    Thanks, looks like it might work.

  7. Mr.CRC

    Mr.CRC Guest

    Vishay VO1263 kicks the butts of the ones all the other guys mentioned!
  8. Hammy

    Hammy Guest

    Yea that was the best one for the price when I was using them about a
    year ago. 4 bucks for a dual, you can stack the output and double the
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