42w 2.1A LED Driver and powering 12v Fan Switching Regulator

Discussion in 'The Projects Forum' started by xxAmritxx, Nov 7, 2013.

  1. xxAmritxx

    Thread Starter New Member

    Nov 6, 2013
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    Hey Guys,

    I'm kind of stuck while making my High Powered LED project

    I need to cool down a heatsink with a fan with the specification of:
    12v and 0.22A

    The led driver is outputting:
    42v and 2.1A

    for a LED Module requiring exactly:
    42v and 2.1A

    I'm thinking of using a switching voltage regulator (LM2575HV-12) fed from the LED driver output and worked out all the components needed for that.

    One thing I cant get my head around is:
    Do I need to find a LED driver with a higher voltage and same current output since I have 42v requied by the LED and 12v required by the fan?

    or do I stick with the 42v from the led driver and that should give the LED exactly 42v and 2.1A and the fan whatever it needs?

    Cant get my head around it and I know its a silly question hehe
    Help would be so grateful people! :)
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Buy a Meanwell LPF-90D-48 (and a 100K potentiometer if you would like manual dimming on this LED module)
    Then buy a 12V @500mA or greater "wall wart" type power supply.

    Run the LED on the meanwell and the fan on the 12V supply.

    Done.. nice and simple
     
  3. xxAmritxx

    Thread Starter New Member

    Nov 6, 2013
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    Last edited: Nov 7, 2013
  4. xxAmritxx

    Thread Starter New Member

    Nov 6, 2013
    7
    0
  5. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    xxAmritxx likes this.
  6. xxAmritxx

    Thread Starter New Member

    Nov 6, 2013
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    I live in uk, sorry to be a pain hehehe.

    So those option above i linked? What you think of them?
     
  7. xxAmritxx

    Thread Starter New Member

    Nov 6, 2013
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  8. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    970
    A fan requires a "constant voltage" power supply..
    An LED requires a "constant current" power supply..

    Those Chinese "LED Drivers" are usually deceiving/inadequately marketed.. They do not clearly state if they are constant current or constant voltage.
    So the answer is "maybe"..

    To power the FAN you simply need a 12V "constant voltage" supply with a current rating higher than what the fan needs.. (A fan will only draw as much current as it needs so having a power supply rated higher than the fan is just fine) Personally I would find a 12V @500mA or greater power supply.
     
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