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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 ligh
2、t, freeze light, projector Emergency light,5,AC input to constant current LED driver - Isolated,6,AC Input Solution - Isolated,Application E27, GU10 . Bulb, Par 30, Par 38 T5, T8 . Light bar, Freeze light Street light, Desk light Richtek advantage High-precision constant current control to limit cur
3、rent accuracy in +/-5% range on mass production. Small package and high integrated solution with less external components to fit into a small bulb or light bar Very low quiescent current Dimming on secondary side to provide better accuracy,7,Secondary side CC/CV controller,AC to CC Isolated secondar
4、y side CC/CV controller & dimming,RT8456,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 w
5、ith the accuracy of transformer. OVP support,8,RT8456 Secondary-side constant Current Controller,Secondary side LED current regulation Support LED voltage up to 45V High accuracy LED current threshold control over wide input voltage and temperature range 0.6mA operation current Programmable LED curr
6、ent through 60mV sense resister Programmable OVP Easily connected to different kinds of primary side solutions TSOT 23-6,9,RT8457: Dimmable secondary side constant current controller,LED voltage up to 45V Support Triac dimming, PWM dimming, analog dimming High accuracy LED current threshold control
7、over wide input voltage and temperature range Programmable LED current through 60mV sense resister Programmable OVP Easily connected to different kinds of primary side solutions SOP-8,Dimming Input,10,RT8454 AC-CC 6-Ch Current Regulators,Vcc up to 50V Programmable channel current 3% current sense am
8、plifier input offset Easy dimming Programmable soft start and OVP Automatic detecting unconnected AND/OR broken channel to avoid output over voltage Vcc under voltage lockout and Thermal shutdown One LDO controller embedded,11,RT8454 AC-CC One-Stage Driving Scheme,12,Application Tip: RT8454Channel N
9、umber Extension,13,Applications: Isolated E26/27, T5/T8, PAR30/38,Primary side solution example Flyback: R7912 (MOS inside) R7732(MOS ext.) Low PF, small output current ripple, good efficiency, good for no-PF requirement condition. Valley-fill PFC+Flyback For small power (0.7 application. Active PFC
10、+Flyback High PF (0.9), lower efficiency, small output current ripple, good for high power design. PFC single stage High PF (0.9), low cost, need big output cap to reduce current ripple. Good for small power, low cost design. LLC High efficiency, high cost. Good for high power, high performance desi
11、gn. Primary side constant current : R7710 Current accuracy is suffered from transformer accuracy. Good for current accuracy +/-10% application,14,Applications: Isolated E26/27, T5/T8, PAR30/38,Secondary side solution RT8456, RT8457, RT8454 can work with any kind of primary side topologies and become
12、 constant current LED drivers except (6) Maintain current accuracy at +/-5% independent of the variation of transformer Non-dimmable: Primary side + RT8456 Dimmable: (bleeder)+ Primary side + RT8457 Support Triac dimming with external bleeder added Support PWM, analog, wireless dimming on secondary
13、side with accurate current control. Using MCU for Traic dimming can provide the best compatibility of dimmer.,15,Valley-fill 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 driv
14、er,High-side PFC buck CC LED driver,RT8460,High-side PFC inverting buck-boost CC LED driver,RT8469,RT8468,MOS inside,18,RT8458 floating buck LED driver for non-isolated application,The best way to drive LEDs from AC power input!,Unique self-biasing floating buck driver topology True average LED curr
15、ent sense High efficiency (90% possible) Cheap and simple external components Very wide input voltage range (16V400V or higher) Stable LED current over wide input voltage range Works with standard series drum choke inductors Support OVP & OCP Small PCB to to fit GU10, E17,19,Three RT8458 application
16、s,Typical application Advantage Very good line regulation. LED current variation between 110V/220V AC input is minor. (0.7 design Disadvantage Big cap for high power or high PF application. Active PF + RT8458 Advantage High PF (0.95) Good for high power, high PF design Disadvantage Higher cost Lower
17、 efficiency,20,RT8458 typical application circuit,OVP option,Vout31V,EMI improvement,21,High-efficiency universal input design,22,RT8458 efficiency vs. LEDs,LED current=350mA,23,RT8459 High PF, floating buck LED driver for non-isolated application,Unique self-biasing floating buck driver topology Tr
18、ue average LED current sense for high PF application Cheap and simple external components Very wide input voltage range (16V400V or higher) Stable LED current over wide input voltage range with high PF support Works with standard series drum choke inductors Support OVP & OCP Small PCB to to fit GU10
19、, 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 output current ripple & big output cap. for PFC single stage design,26,How to choose the driving topology?,Need PFC?,RT8458 typical a
20、pplication,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 or PF0.9,NO,27,DC to CC Solution,28,Richteks Product - DC to Constant Current,Converter,Controller,RT8480,RT8452,RT8450B,RT8
21、482,RT8453B,RT8470,RT8488,Application MR16, AR111 Street light, Desk light, Freeze light Car light, Projector lamp Solar lighting, Emergency light,RT8471,29,Richteks Product - DC to Constant Current,Richtek advantage Cover wide input/output voltage range and support different kinds of topology inclu
22、de buck, boost, buck-boost, SEPIC Accurate output current over wide temperature range Stable output current vs. input/output voltage change Easy Dimming : Analog, PWM or PWM Converting to Analog with One External Capacitor, Triac dimming Support high-speed PWM dimming up to 50kHz Better reliability
23、with bipolar process Cost competitive,30,Selection Guide for DC to CC Products,31,Applications,32,Applications: MR16,Major solutions RT8470 low cost solution Lowest cost solution About 70% Electronic Transformer (ET) compatibility Different brightness with different ET connected Very popular in Chin
24、a RT8453 high ET compatibility solution Very high ET compatibility Keep same brightness with different ET connected Special applications RT8453 dimmable solution Dimmable with minor cost added from the previous solution Same performance as the previous solution without dimmer connected ET limited Wi
25、th selected ET, about 50% dimmer can dim pretty well RT8453 non electrolytic cap solution High ET compatibility with square wave output RT8453 three-step dimming Support three-step dimming with three-step dimming controller added Use ON/OFF break to switch between three steps,33,Application: MR16 (R
26、T8470 BUCK-a typical low cost design),34,MR16RT8470 Buck,CH1: Vin CH4: Iin,CH1: LED voltage CH4: LED current,Average LED current will be different with different ET connected,35,Application: RT8453 MR16,Excellent electronic transformer compatibility High efficiency, stable output LED current Support
27、 Triac dimming with selected ET and Dimmer but no extra cost added No flicker with most of the ET,36,Application: RT8453 MR16,CH1: Vin CH4: Iin,CH1: LED voltage CH4: 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,