LED Circuit help

Discussion in 'General Electronics Chat' started by krishnan_hari83, Jul 6, 2012.

  1. krishnan_hari83

    Thread Starter New Member

    Feb 11, 2012
    21
    0
    Dear Friends,

    I have designed an LED board. The board has 3 nos of 3.2V LED's in series.

    I want to connect 5 such boards in series ( 5 boards * 3 LEDs each = 15 LEDs )

    Kindly tell me what input supply voltage / current I should use.?

    Note: 120mA is the typical forward current for one LED.

    Best Regards,
    H.Krishnan.
     
  2. evilclem

    Member

    Dec 20, 2011
    118
    16
    Why do you wish to connect these boards in series and not parallel?
     
  3. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
    463
    You need a current mode voltage booster that can be adjusted a little below 30V. Microchip has such ICs I think.

    It's also possible when you use an inductor that just has the right dimensions, so it won't provide unlimited current. If voltage goes down just 1V if current increases too much, that would be sufficient.
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
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