From: "R. Lewis"
Subject: Re: luxeon star leds
Date: Fri, 29 Nov 2002 18:25:14 -0000
Organization: Nextra UK
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NNTP-Posting-Date: Fri, 29 Nov 2002 18:23:49 +0000 (UTC)
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"Leeper" wrote in message
> This thread is kinda scary, folks, you really need to heatsink these
> devices very well.
> At the seminar, LumiLeds (Luxeon), mentioned there have been
> many cases where engineers have claimed they were keeping the
> devices cool. Analysis of the failed devices, then taking a look
> at the devices in their application showed they were not being kept
> cool enough, causing subsequent early failures of the devices.
At the beginning of this thread I asked the question as to how to know the
die temp on a luxeon emitter and/or star.
Luxeon quote a tempco of 2mV degC but I found some problem in that the temp
rise on the (star) mcpcb was grater than the temp rise of the junction
calculated on this figure.
Or I did something wrong.