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Did the LM3478 PWM controller become popular?

Discussion in 'Electronic Design' started by Joerg, Apr 29, 2004.

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  1. Joerg

    Joerg Guest

    Hi All,

    The LM3478 looks pretty cool for battery powered stuff. Fits the
    bill for many designs because it runs with an external FET and is
    thus not voltage limited as most other solution.

    Even Digikey has it so it's got to have some followers. What
    puzzled me was that I did not find many application stories via
    Google. Don't need any, just curious: Is it popular?

    Regards, Joerg
     
  2. Joerg wrote...
    No second source... Maybe if they had also offered it in a
    miniDIP package?


    Thanks,
    - Win

    whill_at_picovolt-dot-com (use hill_at_rowland-dot-org for now)
     
  3. Joerg

    Joerg Guest

    Hello Winfield,

    That's exactly my next concern. All these marvelous chips are single
    sourced and I once had to "design out" a chip (different mfg though)
    because the procurement had become a nightmare for the client. So we
    went to a discrete design. Kind of a step back in age but they have
    zero purchasing issues since almost a decade. This one only comes in
    MSOP-8 and die as far as I know.

    Designs using discretes, logic or opamps become tougher as supply
    voltages keep coming down. Here chips like the LM3478 are really
    enticing because of things such as having the sense trip point for
    current mode conversion at 165mV instead of the usual 0.65V.

    Totally off topic: What is that device you are holding in your hand on
    the Art of Electronics cover? A resonator? I always wanted to know.

    Regards, Joerg
     
  4. Joerg wrote...
    The high current-regulation voltages have always bothered me, and
    every new IC gets my scrutiny to see how this issue has been dealt
    with, 95% of the time I'm dissapointed. But you can self-help by
    adding a high-speed non-inverting opamp stage into the mix.
    It's an underwater-instrument pressure housing. Since then I've gone
    to fashionably-trimmed hair and lost my beard - looks years younger,
    don'cha know? Not that I shave every day, I'm seeking the Bruce Willis
    look. But I mean, how does one manage to *always* have a two-day old
    growth? http://www.geocities.com/Hollywood/Set/6406/pics.html

    Anyway, that's what I'm working on.


    Thanks,
    - Win

    whill_at_picovolt-dot-com (use hill_at_rowland-dot-org for now)
     
  5. Beard clippers? Now John Dyson will be claiming you want to emulate
    this guy: http://www.versii.com/image/arafat.jpg


    Best regards,
    Spehro Pefhany
     
  6. Tim Auton

    Tim Auton Guest

    I don't know how trimmed you are now, but one of the best moves I ever
    made was to cut all my hair off. A "number 2" (6mm) trim with the
    clippers on my head and a "number 1" (3mm) on my chin a couple of
    times a week keeps me looking presentable. I was always awful at going
    to the hairdressers and shaving, but my current method has excellent
    laziness tolerance.

    If you do cut all you hair off then buy a hat. It gets damn cold.


    Tim
     
  7. Not for me, I'm keeping my mop as long as I can! It may be white,
    and it may be thinning a bit, but it's all mine!


    Thanks,
    - Win

    whill_at_picovolt-dot-com (use hill_at_rowland-dot-org for now)
     
  8. Spehro Pefhany wrote...
    Bruce Willis, he's not!


    Thanks,
    - Win

    whill_at_picovolt-dot-com (use hill_at_rowland-dot-org for now)
     
  9. An alternate switcher with integrated FET which is also in the range of
    approx. 1$ or below, is the L5970D or L5973D
    http://www.st.com/stonline/books/pdf/docs/7324.pdf
    http://www.st.com/stonline/books/pdf/docs/8588.pdf

    Lhe LM3478 and the LM3488 are also very interesting parts which i've used
    successfully in several projects. The small msop8 was always an advantage in
    the layout.

    MIKE
     
  10. Joerg

    Joerg Guest

    Hi Winfield,

    Actually the clipper suggestion from Tim could work out. I knew someone who
    used a longer comb extender on his clipper and kept the beard in perfectly
    "unshaved" look at all times. Guess you need the right sports car with that
    though. Or at least a Land Rover. I am using a clipper, too, but just to
    keep the beard from growing into a weed-like structure. Can't do the skalp
    thing because most of those hairs are gone now.

    Regards, Joerg
     
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