High power led driver

Discussion in 'General Electronics Chat' started by circuit1234, Jan 7, 2015.

  1. circuit1234

    Thread Starter New Member

    Jan 7, 2015
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    Hi

    I want to make led driver which can drive 110v and 12Amps output DC to DC . for that i choose LT 3795. Should be constant current . can this driver drive these much power , which topology i need to use and is there any other driver
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
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    :cool:What are you trying to do? Light a football stadium? :cool:
    Maybe 100 volts at 12 amps.
     
  3. circuit1234

    Thread Starter New Member

    Jan 7, 2015
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    Hi Ronv
    its a series of led , we need to do some testing , for that we need to design LED driver Which can drive 1kw Power.
     
  4. ronv

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    Hmmm. I think if I was going to try it I would build a simple hysteric buck converter.
     
  5. circuit1234

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    Jan 7, 2015
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    Which IC you prefer i need constant current , and Ref voltage pin for adjusting the current , ( somthing which i can control using DAC)
     
  6. ronv

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    Ahh, Now you are making it harder. Maybe a spec is in order. What output voltage and current to the LEDs.
     
  7. circuit1234

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    Jan 7, 2015
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    Actually output we need is 120volt, 12Amps DC , since the LT3795 cannot handle this much we reduced to 95Volt .
    So OUT PUT we need is 120Volt , 12Amp DC
     
  8. ronv

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    But you just said you wanted to adjust the current. What is the min and max current? Like wise if you want to use 5 leds and 25 leds it will make a difference.
     
  9. circuit1234

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    Jan 7, 2015
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    its 2amps to 12Amps , Voltage 5Volt to 120Volt
     
  10. ronv

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    I think you will have trouble finding something. The one you have chosen might run from 15 volts to 100 volts at 2 to 12 amps, but pretty complicated.
    Maybe you should tell us what you are trying to do as the requirements seem very strange - even dangerous.
     
  11. circuit1234

    Thread Starter New Member

    Jan 7, 2015
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    We are trying to design LED Driver which can use for driving many types of LEDs . Actuall purpose is for testing the LEDs life .some are in tile with a series of LEDs in that case the voltage will change and depends upon the led type current will change .
     
  12. toffee_pie

    Active Member

    Oct 31, 2009
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    12Amps.......

    do you know how high 12A is? why the need for this much?
     
  13. circuit1234

    Thread Starter New Member

    Jan 7, 2015
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    its a module which contains lot of small leds , any driver which you know?
     
  14. ronv

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    You may need to break down your requirements. It is unlikely you can make one that will run at both 5 volts and 120 volts let alone vary the current from 2 to 12 amps.
    I'm going to guess you biggest one is 100 watts - maybe 37 volts at 3 amps? Give us some data sheets on say 3 with a broad range that you want to test and maybe we can come up with a way to switch the input or something like that that will still make it flexible.
     
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