Sharp IV-C35M Uživatelský manuál stáhnout pdf (Strana 12)

C35 Application Note

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C35 Application Note V1.3

Subject to change without notice

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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

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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.

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Figure14.C35LEDI‐Vcurve

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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. 

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4. Brightnesshasa

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

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Sharp IV-C35M Uživatelský manuál Strana 12