Sharp IV-C35M Manuel d'utilisateur télécharger pdf (Page 12)

C35 Application Note



RoHS Compliant www.semileds.com

C35 Application Note V1.3

Subject to change without notice





Page

LightUpTest

1. ThevoltageshouldbelimitedwhenusingapowersupplytolightuptheLEDsafterSMT.Voltage

shouldnotexceed4VforeachLED.Whenthevoltageis4V,thecurrentwillbeinexcessof

1500mA.Thismaydamagetheemitterduetowireorpadburnout

asinFigure13.

e.g.Ifthereisamodulewith3LEDsinseries,themaximumvoltageofthepowersupplyshouldbe

lowerthan12V.



WireburnoutBondingpadburnout

Figure13



2. Checkthepolarityoftheemitter.ReversevoltageandcurrentmaydamagetheZenerdiode.

Figure14showstheC35I‐Vcurveinforwardandreverseoperation.



Figure14.C35LEDI‐Vcurve



3. IfusingaconstantcurrentlimitedvoltagedrivertolightuptheLEDmodule,pleaseconnectthe

powersupplyandtheLEDmodulebeforepluggingthepowersupplyintotheACpowercord.This

canreducetheprobabilityofsurgecurrentdamagingtheLEDmodules. 



4. Brightnesshasa

strongrelationshipwithdrivingcurrentasshowninFigure15.



1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18

Pas de commentaire

Sharp IV-C35M Manuel d'utilisateur Page 12