Sharp IV-C35M Manuel d'utilisateur télécharger pdf (Page 15)

C35 Application Note

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RoHS Compliant www.semileds.com

C35 Application Note V1.3

Subject to change without notice

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Tj=Ta+Rja×PdorTj=Tb+Rjb×Pd

Equation2

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WhenusingC35inluminaires,it’sbettertocontroltheTbtemperaturebelow70°C.ThiswillkeeptheTjof

C35below125°C.Forexample,theRjbofC35inthedatasheetis8°C/W.

TjiscalculatedasbelowifTcis70°C@500mA,Vf=3.4V

Tj=Tb+Rjbx

Pd=70+8x(0.5x3.4)=83.6°C.

WhenheatgathersinsidetheLED,itcausesdegradationofluminousefficacyandlifetime,andresultsin

degradationofexpectedperformance.It’sessentialtohaveagoodthermaldesigntoreleasetheheatto

theambient.

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Sharp IV-C35M Manuel d'utilisateur Page 15