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1 Tehnil Informtion - t nd t Temperture for Controlger en Tble of Content Introdution Definitions for t nd t Differene between t nd t Importne of t nd t Need for two different temperture vlues Position of the t point Prtil use of t nd t Prtil exmples for t nd t tempertures nd their lultion / 5

2 Tehnil Informtion - t nd t Temperture for Controlger en 1. Introdution For ompline with the requirements of the luminire stndrd IEC/EN 60598, no prt of the luminire shll ttin temperture whih would impir sfety when the luminire is operted t its rted mbient temperture t. For the ontrolger the temperture limit is defined s the rted mximum temperture of the se of the ontrolger (t ) mesured t the given referene point mrked by the devie mnufturer. This tehnil informtion explins the mening of the t nd t temperture when nd how to use t nd t the relevne of t nd t for the therml performne nd lifetime of the ontrolger 2. Definitions for t nd t Rted mximum mbient temperture t : The ontrolger stndrd IEC/EN ontins no definition of t nd its mesurement for luminire inbuilt ontrolger. For independent ontrolger the luminire stndrd pplies. The luminire stndrd requires the mrking of the rted mximum mbient temperture t, if other thn 25 C. Rted mximum se temperture t : The definition ording to the lmp ontrolger stndrd IEC/EN is: "highest permissible temperture whih my our on the outer surfe (t the indited ple, if mrked) under norml onditions nd t the rted voltge or the mximum of the rted voltge rnge" 3. Differene between t nd t t = mbient temperture: The temperture rnge of the ir surrounding the eletroni ontrolger delred by the mnufturer. t = se temperture: The temperture of referene point on theontrolger housing. 2 / 5

3 Tehnil Informtion - t nd t Temperture for Controlger en 4. Importne of t nd t The mbient temperture t hs diret influene on the lifetime of eletroni omponents. If the mbient temperture t is too high, the devie nnot emit enough het to the environment. This n result in so-lled hotspots (points where the temperture onentrtes). Hotspots in the ir lose to the omponents n led to premture ging nd filure of the devies. The lifetime of ontrolger is bsed on its mbient temperture. The se temperture t is the highest permissible temperture whih my our t the t point on the ontrolger housing for sfe opertion. 5. Need for two different temperture vlues The mbient temperture t of ontrolger inside luminire is very diffiult to mesure. The mesurement of the t temperture is esier nd more relible. As prt of the design proess, Tridoni onduts mesurements for both t nd t nd mkes sure tht both mesurements meet the highest requirements. Hving relible result for t nd t, it is possible to provide ext orreltions between these two prmeters in the produt dtsheet. This llows the luminire mnufturer to determine the expeted lifetime of the ontrolger bsed on the t temperture whih is esier to mesure. 6. Position of the t point Typilly, the t point is pled diretly bove temperture nd lifetime ritil omponents (e.g. pitor, oil, et.). But there is no binding rule for tht. The t point is defined by the mnufturer nd n be freely hosen. Due to this ft, the t temperture is not suitble to ompre different ontrolger in terms of their therml performne. 7. Prtil use of t nd t For omprison of different ontrolger nd to get relible informtion bout their lifetime, the mbient temperture t hs to be tken into onsidertion. The t temperture is highly dependent on the ext position of the t point nd sine the mnufturer n define this position, it mkes no sense to ompre the t tempertures from different mnufturers. A lower or higher t temperture does not gurntee better qulity or longer lifetime. It ould be the result of different mnufturers using different, more or less fvourble t points. Additionlly, ontrolger from the sme mnufturer n hve different t tempertures but the sme t temperture. Also in tht se the t temperture is relevnt for the lifetime. Only the t temperture n provide relible informtion bout the lifetime of ontrolger. 3 / 5

4 Tehnil Informtion - t nd t Temperture for Controlger en 8. Prtil exmples for t nd t tempertures nd their lultion The following tble shows two different Tridoni devies. Although the t tempertures re different (55 C nd 60 C), the t tempertures (40 C) nd the lifetime ( hours) re the sme. Expeted life-time: Type t 40 C 50 C 60 LED Driver type 1 t 55 C 65 C x Life-time 50,000 h 30,000 h x LED Driver type 2 t 60 C 70 C x Life-time 50,000 h 30,000 h x The LED Driver type 1 hs the following dt for 50,000 hours lifetime:... t : 40 C t : 55 C 4 / 5

5 Tehnil Informtion - t nd t Temperture for Controlger en In the following exmple the LED Driver type 1 is ompred to devie from different mnufturer whih uses different wording (see following tble). Opertionl temperture: Speifition item Vlue Unit Condition T-mx 50 C T-mx 90 C Mximum temperture mesured t T-point T-life 80 C Mesured t T-point Driver lifetime 50,000 h Mesured temperture t T-point is T-life The informtion sys: t (mx): +50 C t (mx): +90 C But the t temperture for lifetime of 50,000 hours is 80 C whih mens tht for this lifetime the t is not 50 C but 40 C. This mens tht the omprble vlues for lifetime of 50,000 hours re: t : +40 C t : +80 C The result shows tht the two ontrolger types (LED Driver type 1 from Tridoni nd the LED Driver from nother mnufturer) hve different t tempertures (80 C nd 55 C) but the t temperture (40 C) nd the lifetime ( h) is the sme. So in this se both hve the sme therml performne. 5 / 5