Texas Instruments LM3423 Handleiding
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COMP
CSH
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HSN
HSP
RPD
IS
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RCT
AGND
OVP
nDIM
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VCC
GATE
PGND
DDRV
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9PWM
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LED
V
IN
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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
LM3421
,
LM3423
SNVS574G–JULY2008–REVISEDJULY2019
LM342xN-ChannelControllersforConstant-CurrentLEDDrivers
1
1Features
1
•V
IN
RangeFrom4.5Vto75V
•High-SideAdjustableCurrentSense
•2-Ω,1-APeakMOSFETGateDriver
•InputUndervoltageandOutputOvervoltage
Protection
•PWMandAnalogDimming
•Cycle-by-CycleCurrentLimit
•ProgrammableSwitchingFrequency
•ZeroCurrentShutdownandThermalShutdown
•LEDOutputStatusFlag(LM3423andLM3423-Q0
Only)
•FaultStatusFlagandTimer(LM3423and
LM3423-Q0Only)
2Applications
•LEDDrivers:Buck,Boost,Buck-Boost,and
SEPIC
•IndoorandOutdoorAreaSSL
•Automotive
•GeneralIllumination
•Constant-CurrentRegulators
3Description
TheLM3421andLM3423familyofdevicesare
versatilehighvoltageN-channelMOSFETcontrollers
forLEDdrivers.Theycanbeeasilyconfiguredin
buck,boost,buck-boostandSEPICtopologies.This
flexibility,alongwithaninputvoltageratingof75V,
makesthethesecontrollersidealforilluminating
LEDsinalargefamilyofapplications.
Adjustablehigh-sidecurrentsensevoltageallowsfor
tightregulationoftheLEDcurrentwiththehighest
efficiencypossible.TheLM3421andLM3423devices
usepredictiveoff-time(PRO)control,whichisa
combinationofpeakcurrent-modecontrolanda
predictiveoff-timer.Thismethodofcontroleasesthe
designofloopcompensationwhileprovidinginherent
inputvoltagefeed-forwardcompensation.
TheLM3421andLM3423devicesincludeahigh-
voltagestart-upregulatorthatoperatesoverawide
inputrangeof4.5Vto75V.TheinternalPWM
controllerisdesignedforadjustableswitching
frequenciesofupto2MHz,thusenablingcompact
solutions.
DeviceInformation
(1)
PARTNUMBERPACKAGEBODYSIZE(NOM)
LM3421HTSSOP(16)5.00mm×4.40mm
LM3423HTSSOP(20)6.50mm×4.40mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
TypicalBoostApplication
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM3423 |
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