TITIDA－01358智能恒温器电源参考设计

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1、TITIDA-01358智能恒温器电源参考设计时间：2017-03-1510:44:11作者：TI来源：中电网TI公司的TIDA-01358是用于智能恒温器的24VAC功率电源参考设计，采用LM5166超低IQ的降压转换器，具有低BOM成本和高效率性能,输入为24VAC,输出电压5V和3.3V,集成了虫辿充电和负载通路，整个负载电流范围内高效率,USB过流兼容，主要用在恒温器，视频门铃，无线视频监视和网关.本文介绍了LM5166主要特性和框图，以及24VAC智能恒温器电源参考设计TIDA-01358主要特性，框图，电路图，材料清单和PCB设计图.TheLM5166isa

2、compact,easy-to-use,3-Vto65-V,ultra-lowIQsynchronousbuckconverterwithhighefficiencyoverwideinputvoltageandloadcurrentranges.Withintegratedhigh-sideandlow-sidepowerMOSFETs,upto500mAofoutputcurrentcanbedeliveredatfixedoutputvoltagesof3.3Vor5V,oranadjustableoutputTheconverterisdesignedtosim

3、plifyimplementationwhileprovidingoptionstooptimizetheperformaneeforthetargetapplication.PulsefrequencyModulation(PFM)modeisselectedforoptimallight-loadefficiencyorConstantOn-Time(COT)controlfornearlyconstantoperatingfrequency.Bothcontrolschemesdonotrequireloopcompensationwhileprovidingex

4、cellentlineandloadtransientresponseandshortPWMon-timeforlargestep-downconversionratios・Thehigh-sidep-channelMOSFETcanoperateat100%dutycycleforlowestdropoutvoltageanddoesnotrequireabootstrapcapacitorforgatedrive.Also,thecurrentlimitsetpointisadjustabletooptimizeinductorselectionforapartic

5、ularoutputcurrentrequirementSelectable/adjustablestartuptimingoptionsincludeminimumdelay(nosoft-start),internallyfixed(900ps),andexternallyprogrammablesoft-startviaanexternalcapacitor.Anopen-drainPGOODindicatorcanbeusedforsequencingandoutputvoltagemonitoring・TheLM5166isavailableinaVSON-1

6、0packagewith0.5-mmpinpitch.LM5166主要特性：1*Wide3-Vto65-VInputVoltageRange・9.7-pANo-LoadQuiescentCurrent•-40°Cto150°CJunctionTemperatureRange•MeetsEN55022andCISPR22EMIStandards・Integrated1-QPFETBuckSwitch一Supports100%DutyCycleforLowDropout•Integrated0.5-QNFETSynchronousRectifier-EliminatesEx

7、ternalSchottkyDiode•ProgrammablePeakCurrentLimitSupports:一500mA,300mA,or200mALoads•Fixed(5V,3.3V)orAdjustableVOUTOptions•TwoSelectableControlOptions:一COTforNearlyConstantFrequency-PFMforMaximumEfficiency•1.223-V±1.2%InternalVoltageReference•SwitchingFrequencyupto600kHz•90