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5. Drive Method
AndLEDdisdadcurrent-operatedddevice.dIndorderdtodensuredintensityduniformitydondmultipledLEDsdconnecteddindparal-
leldindandapplication,ditdisdrecommendeddthatdadcurrentdlimitingdresistordbedincorporateddindtheddrivedcircuit,dindseriesd
withdeachdLEDdasdshowndindCircuitdAdbelow.d
(A)dRecommendeddcircuit.
(B)dThedbrightnessdofdeachdLEDdmightdappearddi erentdduedtodtheddi erencesdindthedI-Vdcharacteristics
ofdthosedLEDs.
d 6. ESD (Electrostatic Discharge)
StaticdElectricitydordpowerdsurgedwillddamagedthedLED.d
SuggestionsdtodpreventdESDddamage:
Usedofdadconductivedwristdbanddordanti-electrostaticdglovedwhendhandlingdthesedLEDs.
Allddevices,dequipment,danddmachinerydmustdbedproperlydgrounded.
Workdtables,dstoragedracks,detc.dshoulddbedproperlydgrounded.
UsediondblowerdtodneutralizedthedstaticdchargedwhichdmightdhavedbuiltdupdondsurfacedofdthedLED'sdplasticdlensdasdad
resultdofdfrictiondbetweendLEDsdduringdstoragedanddhandling.
ESD-damageddLEDsdwilldexhibitdabnormaldcharacteristicsdsuchdasdhighdreversedleakagedcurrent,dlowdforwarddvoltage,dd
ord"nodlightup"datdlowdcurrents.
TodverifydfordESDddamage,dcheckdford"lightup"danddVfdofdthedsuspectdLEDsdatdlowdcurrents.
ThedVfdofd"good"dLEDsdshoulddbed>2.0V@0.1mAdfordInGaNdproductdandd>1.4V@0.1mAdfordAlInGaPdproduct.
SMD LED > Application Notes
059 d2013dCatalogd|dwww.liteon.com/opto
