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1、LED Lighting Driver IC Introduction,2,3,LED Lighting Driver IC Overview,4,LED Lighting Driver IC Overview,LED Lighting,AC/CC,DC/CC,Isolated,Non-isolated,With ET,Without ET,E26/E27/E17,T5/T8 Par30/Par38,Street light,GU10,E26/E27/E17 T5/T8,Par30/Par38,MR16,AR111,Street light,car light,desk light,freez
2、e light,projector Emergency light,5,AC input to constant current LED driver-Isolated,6,AC Input Solution-Isolated,ApplicationE27,GU10.Bulb,Par 30,Par 38T5,T8.Light bar,Freeze lightStreet light,Desk lightRichtek advantageHigh-precision constant current control to limit current accuracy in+/-5%range o
3、n mass production.Small package and high integrated solution with less external components to fit into a small bulb or light barVery low quiescent currentDimming on secondary side to provide better accuracy,7,Secondary side CC/CV controller,AC to CC Isolated secondary side CC/CV controller&dimming,R
4、T8456,RT8454,RT8457,Single channel CC/CV controller,Single channel CC/CV controller with dimming,Multi-channel CC/CV controller with dimming,Easily work with any kind of primary side topology.Provide high precision LED current.LED current accuracy does not vary with the accuracy of transformer.OVP s
5、upport,8,RT8456 Secondary-side constant Current Controller,Secondary side LED current regulationSupport LED voltage up to 45VHigh accuracy LED current threshold control over wide input voltage and temperature range0.6mA operation currentProgrammable LED current through 60mV sense resisterProgrammabl
6、e OVPEasily connected to different kinds of primary side solutionsTSOT 23-6,9,RT8457:Dimmable secondary side constant current controller,LED voltage up to 45VSupport Triac dimming,PWM dimming,analog dimmingHigh accuracy LED current threshold control over wide input voltage and temperature range Prog
7、rammable LED current through 60mV sense resisterProgrammable OVPEasily connected to different kinds of primary side solutionsSOP-8,Dimming Input,10,RT8454 AC-CC 6-Ch Current Regulators,Vcc up to 50VProgrammable channel current3%current sense amplifier input offsetEasy dimmingProgrammable soft start
8、and OVPAutomatic detecting unconnected AND/OR broken channel to avoid output over voltageVcc under voltage lockout and Thermal shutdownOne LDO controller embedded,11,RT8454 AC-CC One-Stage Driving Scheme,12,Application Tip:RT8454Channel Number Extension,13,Applications:Isolated E26/27,T5/T8,PAR30/38
9、.,Primary side solution exampleFlyback:R7912(MOS inside)R7732(MOS ext.)Low PF,small output current ripple,good efficiency,good for no-PF requirement condition.Valley-fill PFC+FlybackFor small power(0.7 application.Active PFC+FlybackHigh PF(0.9),lower efficiency,small output current ripple,good for h
10、igh power design.PFC single stageHigh PF(0.9),low cost,need big output cap to reduce current ripple.Good for small power,low cost design.LLCHigh efficiency,high cost.Good for high power,high performance design.Primary side constant current:R7710Current accuracy is suffered from transformer accuracy.
11、Good for current accuracy+/-10%application,14,Applications:Isolated E26/27,T5/T8,PAR30/38.,Secondary side solutionRT8456,RT8457,RT8454 can work with any kind of primary side topologies and become constant current LED drivers except(6)Maintain current accuracy at+/-5%independent of the variation of t
12、ransformerNon-dimmable:Primary side+RT8456Dimmable:(bleeder)+Primary side+RT8457Support Triac dimming with external bleeder addedSupport PWM,analog,wireless dimming on secondary side with accurate current control.Using MCU for Traic dimming can provide the best compatibility of dimmer.,15,Valley-fil
13、l PFC+R7732+RT8456,16,AC input to constant current LED driver-Non-isolated,17,AC-CC non-isolated product roadmap,RT8458,AC to CC non-isolated,RT8459,High-side buck CC LED driver,High-side PFC buck CC LED driver,RT8460,High-side PFC inverting buck-boost CC LED driver,RT8469,RT8468,MOS inside,18,RT845
14、8 floating buck LED driver for non-isolated application,The best way to drive LEDs from AC power input!,Unique self-biasing floating buck driver topologyTrue average LED current senseHigh efficiency(90%possible)Cheap and simple external componentsVery wide input voltage range(16V400V or higher)Stabl
15、e LED current over wide input voltage rangeWorks with standard series drum choke inductorsSupport OVP&OCPSmall PCB to to fit GU10,E17.,19,Three RT8458 applications,Typical applicationAdvantageVery good line regulation.LED current variation between 110V/220V AC input is minor.(0.7 designDisadvantageB
16、ig cap for high power or high PF application.Active PF+RT8458AdvantageHigh PF(0.95)Good for high power,high PF designDisadvantageHigher costLower efficiency,20,RT8458 typical application circuit,OVP option,Vout31V,EMI improvement,21,High-efficiency universal input design,22,RT8458 efficiency vs.LEDs
17、,LED current=350mA,23,RT8459 High PF,floating buck LED driver for non-isolated application,Unique self-biasing floating buck driver topologyTrue average LED current sense for high PF applicationCheap and simple external componentsVery wide input voltage range(16V400V or higher)Stable LED current ove
18、r wide input voltage range with high PF supportWorks with standard series drum choke inductorsSupport OVP&OCPSmall PCB to to fit GU10,E17.,24,RT8459 typical application circuit,25,RT8459 test result with universal input,*Good line regulation for universal input with high PF support,*NOTED:Higher out
19、put current ripple&big output cap.for PFC single stage design,26,How to choose the driving topology?,Need PFC?,RT8458 typical application,NO,Small output current ripple?,RT8459 typical application,Valley-fill PFC+RT8458 good for small power,PF in 0.70.9,Active PFC+RT8458,good for high power design o
20、r PF0.9,NO,27,DC to CC Solution,28,Richteks Product-DC to Constant Current,Converter,Controller,RT8480,RT8452,RT8450B,RT8482,RT8453B,RT8470,RT8488,ApplicationMR16,AR111Street light,Desk light,Freeze lightCar light,Projector lampSolar lighting,Emergency light,RT8471,29,Richteks Product-DC to Constant
21、 Current,Richtek advantageCover wide input/output voltage range and support different kinds of topology include buck,boost,buck-boost,SEPICAccurate output current over wide temperature rangeStable output current vs.input/output voltage changeEasy Dimming:Analog,PWM or PWM Converting to Analog with O
22、ne External Capacitor,Triac dimmingSupport high-speed PWM dimming up to 50kHzBetter reliability with bipolar processCost competitive,30,Selection Guide for DC to CC Products,31,Applications,32,Applications:MR16,Major solutionsRT8470 low cost solutionLowest cost solutionAbout 70%Electronic Transforme
23、r(ET)compatibilityDifferent brightness with different ET connectedVery popular in ChinaRT8453 high ET compatibility solutionVery high ET compatibilityKeep same brightness with different ET connectedSpecial applicationsRT8453 dimmable solutionDimmable with minor cost added from the previous solutionS
24、ame performance as the previous solution without dimmer connectedET limitedWith selected ET,about 50%dimmer can dim pretty wellRT8453 non electrolytic cap solutionHigh ET compatibility with square wave outputRT8453 three-step dimmingSupport three-step dimming with three-step dimming controller added
25、Use ON/OFF break to switch between three steps,33,Application:MR16(RT8470 BUCK-a typical low cost design),34,MR16RT8470 Buck,CH1:VinCH4:Iin,CH1:LED voltageCH4:LED current,Average LED current will be different with different ET connected,35,Application:RT8453 MR16,Excellent electronic transformer com
26、patibilityHigh efficiency,stable output LED currentSupport Triac dimming with selected ET and Dimmer but no extra cost addedNo flicker with most of the ET,36,Application:RT8453 MR16,CH1:VinCH4:Iin,CH1:LED voltageCH4:LED current,Very stable LED current with different ET connected,37,Applications:Street Light(I),38,Applications:Street Light(II),39,Applications:Street Light(III),40,Application:Thermal protection,41,Selection guide,42,LED Lighting Selection Guide Sorted by Application,
