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DC/DC power for driving LED-backlit LCDs (Part 1 of 2)

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fdunn0
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re: DC/DC power for driving LED-backlit LCDs (Part 1 of 2)
fdunn0   10/28/2010 11:25:39 PM
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To: t.alex: good engineering would make the determination of (current vs lumins) vs overall panel cost a primary objective. Which brings me to something not addressed in the LED panel drive circuits shown. Brightness is not a part of the feedback loop. LEDs are wonderful long lasting devices, but they do age and some short. The author is assuming equal luminosity from all LEDS which in a controlled batch may not be an issue but most mrfs are not going to stop a reel for a new batch. Also in your Hysteretic power source you should note that a High Temp and High frequency electrolytics should be used else the controller will become unstable when the 'lytic starts to age. Other than those comments I look forward to part 2.

t.alex
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re: DC/DC power for driving LED-backlit LCDs (Part 1 of 2)
t.alex   10/24/2010 12:12:45 AM
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When driving Led, one important factor is current consumption. Which of the methods above will consume the least current?

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