Re: About thermal resistance of LEDs
- From: Victor Roberts <xxx@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 18 Sep 2007 08:54:11 -0400
On Tue, 18 Sep 2007 02:31:09 +0800, "Raymond Chou"
<93246020@xxxxxxxxxxxxx> wrote:
Hi all:
I have a question about thermal resistance of LEDs.
For a single LED, is the thermal resistance a constant value?
Further, is the thermal resistance independent on the driving
current and the junction temperature?
Hope your reply, thanks a lots
No. For all materials the thermal resistance, like the
electrical resistance, is a function of the temperature of
the material. However, over the typical temperature ranges
for most LEDs, the change in thermal resistance due to
temperature will be very small compared to other factors
that must be taken into consideration.
For a good discussion of thermal design for LED applications
see the Luxeon Application Brief AB05, Thermal Design Using
Luxeon Power Light Sources:
http://www.luxeon.com/pdfs/AB05.pdf
--
Vic Roberts
http://www.RobertsResearchInc.com
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