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LED Array Power Source

Discussion in 'Electronic Design' started by James Roberts, Dec 1, 2003.

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  1. I wish to power the below LED array:

    http://www.sunbriteleds.com/images/pdf/SSP-LXC206650B.pdf

    for continuous use with maximum brightness, without burning
    out the LEDs.
    I am curious, what would be someone's recommendations for
    voltage and current ratings on an AC adapter, as well as
    the resistor value?
    I will probably use a standard wall wart, regulated, at
    a common voltage and current rating.
    I could experiment, but I don't want to blow $30 on a
    paperweight.
    Thank you for your time.
    James Roberts
     
  2. Ban

    Ban Guest

    James Roberts wrote:
    || I wish to power the below LED array:
    ||
    || http://www.sunbriteleds.com/images/pdf/SSP-LXC206650B.pdf
    ||
    || for continuous use with maximum brightness, without burning
    || out the LEDs.
    || I am curious, what would be someone's recommendations for
    || voltage and current ratings on an AC adapter, as well as
    || the resistor value?
    || I will probably use a standard wall wart, regulated, at
    || a common voltage and current rating.
    || I could experiment, but I don't want to blow $30 on a
    || paperweight.
    || Thank you for your time.
    || James Roberts

    If you use this current source, you do not necessarily need a stabilized
    supply. The total current is a bit more than 250mA. With the multimeter you
    can measure the emitter voltage and then calculate the resistor for exactly
    300mA, or whatever your array allows. The red LED is not only a voltage
    reference but serves as a remote indicator too.
    Build the circuit and then test it with a 33R/5W resistor instead of the
    array. With 300mA the voltage should be 9.9V across the resistor.
    Choose a wallwart of 500mA 12V at least. The transistor can be any NPN-small
    power type of Ic=1A, Pt=1W in free air and hfe>100.

    +---------+-------o+13...17V
    | |
    .-. o+
    | | LED-cluster
    750| | o-
    '-' |
    | |/
    1.9V +-------| BD135-16
    | |>
    | |1.2V
    | .-.
    red LED(V) | |
    - | |4R7/1W
    | '-'
    | |
    +---------+-------o GND
    created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de
     
  3. Peter Lowrie

    Peter Lowrie Guest

  4. Be sure to derate the operating current to maybe 200mA total to allow
    for Ta>25°C.

    Best regards,
    Spehro Pefhany
     
  5. The data seems a little.. sparse. What's the principle of operation of
    your invention?

    Best regards,
    Spehro Pefhany
     
  6. Peter Lowrie

    Peter Lowrie Guest

    Gee, thanks Spehro.
    PWM, thermocouple, current shunt. If you care to email me I would like to
    provide more detailed help.

    Kind regards
    Peter Lowrie
     
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