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From: "R. Lewis"
Subject: Re: current source for array of infrared leds
Date: Sun, 1 Dec 2002 17:06:35 -0000
Organization: Nextra UK
NNTP-Posting-Date: Sun, 1 Dec 2002 17:05:07 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Harry Dellamano" wrote in message
> "Harry Dellamano" wrote in message
> > Hey Frank,
> > Driving LEDS in current mode sucks. There is no tempco tracking for
> > constant light and it's not efficient. Most larger arrays are driven in
> > constant voltage mode, look at traffic lights (300 LEDs, 2.5V, 0.03A, 20
> > Better efficiency and first order tempco tracking.
> > regards
> > harry
> I don't get it. I make a very controversial statement to this thread that
> contains many astute contributors and receive no feedback. At first I
> thought that maybe I am on everybody's kill file because this happens
> to me but the thread stopped completely like the plague had arrived.
> My style may be abrasive but I believe that there is some merit for
> constant voltage drive for LEDs and would like to discuss it. Am I so far
> off base that discussion is not possible. At least Robert would have given
> me some feedback.
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 are
trying to say.
Especially as this 'constant voltage' has, you claim, better efficiency.
What it is more efficient at/ than we eagerly await.
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