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  1. 03-09-2011, 11:41 PM #11
    aVaTar
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    Re: Elementary question on electronics

    Actually, the converter would be more efficient, since it transfers(converts) 90% of power whereas resistors would transfer only 40%.
    But as you said 6W is not that much, so for simplicity's sake I'll just use 12v supply
    Thanks for your help Rob!
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  2. 03-10-2011, 03:11 PM #12
    Leo Bodnar
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    Re: Elementary question on electronics

    The most efficient would be boost LED current controller but it is probably a waste of effort to control just a few LEDs.
    I am not sure they are made in anything larger then SOT or SOIC sized packages.
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  3. 03-10-2011, 03:47 PM #13
    aVaTar
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    Re: Elementary question on electronics

    Quote Originally Posted by Leo Bodnar View Post
    The most efficient would be boost LED current controller but it is probably a waste of effort to control just a few LEDs.
    I am not sure they are made in anything larger then SOT or SOIC sized packages.
    Do you mean PWM base driver? I planned to use one for brightness control on the back-lighting LEDs by pluging it into the +12 Bus for the whole MIP.
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  4. 03-10-2011, 04:54 PM #14
    Leo Bodnar
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    Re: Elementary question on electronics

    It's similar to DC-DC converter but instead of regulating voltage it regulates current. There are buck and boost varieties. Efficiency is usually 85-95%. There are literally hundreds of them. Here is a random pick from the ones I have personally used.
    http://www.fairchildsemi.com/ds/FA%2FFAN5331.pdf
    R1 and R2 are actually for current measurement - they dissipate almost nothing so 0.125W is fine. Overall efficiency is about 90%.
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