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Electronics PWM linear constant current supply

Discussion in 'Modding' started by specialk, 29 Jan 2008.

  1. specialk

    specialk What's a Dremel?

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    I am using 1 Amp constant current regulators, composed of 3 AMC7135 current regulators in parallel (http://www.micro-bridge.com/data/ADD/AMC7135.pdf), to drive Luxeon K2 LEDs (I know, lower than their maximum current but the difference in brightness is negligible).

    I wanted to ask whether I should PWM the inputs or the outputs of the boards using MOSFETs to change the brightness of the LEDs. Any recommendations?
     
  2. Cinnander

    Cinnander What's a Dremel?

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    You could do if efficiency is an issue, or you could try a variable current source (would still require a MOSFET) (this one can do up to 440mA), or perhaps even just a chunky resistor in series with the LEDs.
     
  3. specialk

    specialk What's a Dremel?

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  4. Cinnander

    Cinnander What's a Dremel?

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    They should survive PWM just fine
     

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