InfineonTLD5085EJ1.8A功率LED驱动方案

InfineonTLD5085EJ1.8A功率LED驱动方案关键词：电源管理,LED驱动器Infineon公司的TLD5085EJ是否1.8ADC/DC降压转换器Infineon®功率LED驱动器,输入电压从4.75V到45V,恒流或恒压调整,370kHz开关频率,PWM调光,输出电流误差±2%,主要用于汽车照明,大功率LED应用,恒流和恒压源.本文介绍TLD5085EJ主要特性,方框图,降压稳压器方框图,恒压模式和恒流模式应用方框图.TLD5085EJ:1.8ADC/DCStep-DownConverterInfineon®PowerLEDDriverTheTLD5085EJisasmartLEDbuckconverterwithanintegratedpower-switch,capableofdrivingupto1.8Aloadcurrentwithexcellentlineandloadregulation.Themainfunctionofthisdeviceistostep-downtheinputvoltageandregulatingaconstantLEDcurrent.TheconstantcurrentregulationisespeciallybeneficialforLEDcoloraccuracyandlongerlifetime.TheTLD5085EJalsohasaPWMinputwhichcanbeusedforLEDdimming.Theswitchingfrequencyof370kHzallowstousesmallandinexpensivepassivecomponents.AnEnablefunctionisimplementedtoreducetheshut-downcurrentconsumptiontotyp.0.1μA.ThisICissuitedforuseintheharshautomotiveenvironmentsandprovidesprotectionfunctionssuchascurrentlimitationandovertemperatureshutdown.Theintegratedsoft-startfeatureavoidsacurrentandvoltageovershotattheoutputduringstart-upofthedevice.TLD5085EJ主要特性:•WideInputVoltageRangefrom4.75Vto45V•ConstantCurrentorConstantVoltageRegulation•DrivesLEDsinBuckTopology•Verylowshutdowncurrentconsumption(typ.0.1μA)•370kHzswitchingfrequency•PWMDimming•Integratedpower-switch(outputcurrentupto1.8A)•InternalSoft-Startfunction•±2%outputcurrenttolerance(±4%forfullloadcurrentrange)•Smallthermallyenhancedexposedheatslugpackage•OverTemperatureShutdown•AECQualified•GreenProduct(RoHSCompliant)TLD5085EJ应用:•AutomotiveLighting(ReadingLight,DomeLight,DashboardBacklighting)•HighPowerLEDApplications•ConstantCurrentandVoltageSource图1.TLD5085EJ方框图图2.TLD5085EJ降压稳压器方框图图3.TLD5085EJ应用方框图(恒压模式)AO-Electronics傲壹电子官网：中文网：驱动器方框图(恒流模式)