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From: "Tom Del Rosso"
References: <firstname.lastname@example.org> <email@example.com>
Subject: Re: What is maximum current for LED?
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
NNTP-Posting-Date: Wed, 02 Oct 2002 20:00:10 GMT
Organization: AT&T Worldnet
Date: Wed, 02 Oct 2002 20:00:10 GMT
"The little lost angel" wrote in
> On Wed, 2 Oct 2002 05:51:57 -0400, "Boris Nogoodnik"
> >Interesting question. Specs give you constant current ratings that
> >them. Damage is caused mainly by overheating. However, there is one
> Is there any way to determine the overheating limit for a generic LED?
> I'm designing my circuit to drive around 11mA to 13mA through the LED
> and hoping that being right next to a heatsink that might be
> dissipating upwards of 50W won't hurt it.
Air is a good thermal insulator, and the LED being heated from the
outside is a very different story. If it was heated from the inside
then the die temperature would be much hotter than the outer surface, so
an LED that has burned up probably was hotter at the die than the outer
part of that heatsink ever will be.
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