Datasheet

23.04.2010 ©Vellemannv
2
Note:
OriginallythePCBsholdingtheLEDswerecoppercoloured.NewgenerationLEDstripshavewhitecoated 
PCBs,whichgiveamoreuniformlightdistribution.
2)Determinethelengthandthenr.ofLEDspermeter
StandardLEDstripshavealengthof5mandcontaina numberofseriesandparallelconnectedLEDs.This
designenablesyoutocutthestripeveryfixednumberofLEDs;theplaceswher ethestripcanbecutare
clearlymarkedonthestrip.
Cut‐offpartsofthestrips
arenotwastedasitispossibletosoldernewpowersupplywirestothesecut‐off
parts.
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AlsoLEDstripsmayhaveadifferentamountofLEDspermeter.MostcommonareLEDstripswith30or60
LEDspermeter,thusastandardlength5mLED
stripisavailablewith300or600LEDs.
WhichamountofLEDsisbetterforyourapplicationcanbede terminedbyfollowingfactors:
MoreLEDspermeter:
Morelightoutput,moreuniformlightdistribution–betterfordirectlighting
Highercurrent/powerratingswhichha simpactonheat,totallength,power
supplyandcontroller
LessLEDspermeter:
Lesslightoutput,moredispersedlightdistribution–especiallysuitableforindirectlighting
Lowercurrent/powerratingswhichhasimpactonheat,totallength,powersupplyandcontroller
IsitpossibletointerconnectLEDstripstocreatelongerdistances?
Yes,butkeepfollowinglimitationin
mind:
EachLEDstripwillconsumethesameamountofpower.IfLEDstripsareinterconnectedthetotalpowerand
thuscurrenttroughtheLEDstripsincreasesandthiscurrentislimitedbythedesignofthestrip(checkthe
LEDstripdatasheetforratingsandlimitations).
Example:
You
needatotalLEDstriplengthof20mblueLEDstripwith60LEDspermeter(VellemanCHLS3B).Itwould
seemlogicaltojustinterconnectfourfulllengthstripsof5mtoreach20m.
InthedatasheetyoufindthatasingleCHLS3Bneedsa12Vdcsupplyanddraws1.5A
current(18Wpower).
IfcurrentorpowerisnotrateduseJoule’slaw:Power(W)=Voltage(V)xCurrent(A)orCurrent(A)=Power
(W)/voltage(V).
Ifyouinterconnect4stripsthepowerincreasesto4x18W=72Wandcurrentincreasesto4x
1.5A=6A.
Thiscurrentmustpassthroughthefirststriptoreachthelaststrip.Duetodesignlimitations,thetracks
insidetheLEDstripcanonlytakeabout4Awithoutbeingirreversiblydamaged,whichlimitsthetotallength
to10m(2x1.5A=3A)ofLEDstrips.
Thesolutionistointerconnecttwotimes2strips,andconnectthese
separatelytothecontrollerorpowersupply.Todeterminethepowersupplyorcontrollerreferto§4and§5.