LED driver found by the sidewalk...

Discussion in 'General Electronics Chat' started by Externet, Dec 13, 2015.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Looks like ----> http://poweradapter.co/images/1/ikea_ELP03PE1-A.gif

    Has a coaxial power jack and marked

    Output:
    Constant current : DC350mA 0.5V...7.2V
    Constant voltage: DC 8.5V | <300mA

    How is that supposed to be used;
    for any LED strip meant for less than 7.2VDC and exactly 350ma current ?
    If the consumption of the load takes less than 300mA, then this thingy outputs a fixed 8.5V ?
     
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    It will give out constant current at 350mA, as the load varies in resistance it will maintain the current within the voltage range of 0.5 to 7.2V..
     
    ErnieM likes this.
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Yes.
    Yes.

    Another way of saying it: It is a voltage-limited (to 8.5V) constant-current source of 350mA.
     
  4. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    Current for an LED needs to be limited. When you do not care about power consumption, a resistor input in series with the LED. Cheaper and easier to build.

    The device you found is switching constant current supply so it is very efficient.

    The first spec says the LEDs need to operate between .5V and 7.V and then the current will be limited to 350ma.

    The second spec is very odd. Not sure what the heck it means.
     
  5. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    Thinking about it again I think you are right. It is saying that if the circuit only requires <300 ma the output will be 8.5V.
     
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