CC driver for 12x 1W ?

Discussion in 'The Projects Forum' started by JMD, Feb 6, 2010.

  1. JMD

    Thread Starter Member

    Dec 9, 2009
    96
    0
    My project have increased in size since i started, and the LM3407 is no longer suitable for driving the amount of LEDs that i need. I need to drive 12 LEDs in series.

    Input voltage must be one of these:
    - 230VAC 50 Hz
    - 15VAC 50 Hz
    - 21VDC

    The LEDs:
    - 3V and 300mA
    or
    - 3.15V and 350mA


    I would prefer to make circuit myself, but i kinda like the BoostPuck ( http://www.leddynamics.com/LuxDrive/datasheets/4015-BoostPuck.pdf ). High efficiency, easy to use and adjustable.


    Anyone know a good circuit (with good efficiency = no LM317 circuit please)?
    Or just a good off-the-shelf driver?


    Thank in advance!
     
  2. JMD

    Thread Starter Member

    Dec 9, 2009
    96
    0
    No one at all ?
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    Perhaps take a look at the LM3409.
    Make it for 600 - 700 mA, put two rows of 6 leds parallel
    (a 4.7 Ohm / 1 Watt resistor in series with each row to compensate for led differences).

    Greetings,
    Bertus
     
    Last edited: Feb 10, 2010
  4. JMD

    Thread Starter Member

    Dec 9, 2009
    96
    0
    Parallel isnt really an option. Adding a resistor will only add to lower effiency - which then removes some of the idea of using LEDs.
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    Then take a look at the LM3421 wich is a boost converter.

    Greetings,
    Bertus
     
  6. JMD

    Thread Starter Member

    Dec 9, 2009
    96
    0
    Looks quite okay - gonna give it a look! Sadly its only made in SMD too.. i like leaded compoents alot more - but it seems hard to find any of those. At least from NS.
     
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