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From: "Harry Dellamano"
Subject: Re: current source for array of infrared leds
Date: Mon, 2 Dec 2002 08:06:59 -0800
Organization: Posted via Supernews, http://www.supernews.com
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"R. Lewis" wrote in message
> It depends upon what you mean by constant voltage mode. Since 'Most larger
> arrays,... look at traffic lights' are not driven by what is generally
> understood as 'constant voltage', it is difficult to comprehend what you
> trying to say.
> Especially as this 'constant voltage' has, you claim, better efficiency.
> What it is more efficient at/ than we eagerly await.
If the constant current source is developed from a fixed voltage driving
LEDs in series with a constant current circuit then it's efficiency would be
lower than a constant voltage supply driving the LEDs directly. Of course
the supply could be current controlled driving the LEDs directly with a
temperature term added to get tempo tracking for constant light but this is
added circuitry. The constant voltage supply across the LEDs does the tempco
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