新型多串半桥谐振高效LED驱动解决方案及其应用Li,Richard.TI

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1、_ _新型多串半桥谐振高效新型多串半桥谐振高效LEDLED驱动解决驱动解决方案及其应用方案及其应用Add Speakers Name HereLED General Illumination LED LightingResidential 100W) LED Lighting Driver Topology15pcs LEDs in Series1. AC/DC Power Stage2. Constant Current Driver Stage+UCC28061( Inter TM PFC)UCC28810/1(TM PFC)TPS40211TPS40200TPS54160TPS40211

2、TPS40200TPS54160UCC25600 (LLC)High Watt (100W) LED Lighting Efficiency BudgetConventional Topology Issues: L High cost: PFC+LLC+CC BUCK (multi-chips!)L Low efficiency (88%)L Low reliability (many components counts)L EMI issues97%96%95%93% (Three stages multi-string transformer solution)Innovative tw

3、o stages multi-string LLC topology for LED lighting UCC28810UCC28811UCC25600UCC28810UCC25710newBenefits for the proposed topology: High efficiency 92% Low cost (no need CC DC/DC driver) High reliability Easy EMI PWM or analog dimming compatibleWhy Transformer Can Balance CurrentTransformer current i

4、s in reverse proportion to turn ratioIp/Np = Is/Ns; Is=Ns*Ip/NpWhen transformer primary is connected together, their primary current must be the sameWhen T1 is the same as T2 because of transformer operation principle their secondary current is the sameIs1=Np*Ip/Ns=Is224132413NpNpNsNsIpT1T2IpIs1Is2M

5、ulti-Transformer Architecture (TI Patented)One transformer control two LED strings!l General LED Lighting l LED TV Backlighting Industry first single chip LLC controller for driving multiple LED strings directly from PFC output Adjustable Fmin (3% accuracy), and Fmax 6% (accuracy) Closed Loop LED St

6、ring Current Control PWM Dimming Input LLC and Series LED Switch Control for Dimming Programmable Dimming LLC ON/OFF Ramp for Elimination of Audible Noise Closed Loop Current Control at Low Dimming Duty-Cycles Programmable Soft Start Accurate VREF for Tight Output Regulation Over-voltage and Under-v

7、oltage and Input Over-current Protection with Auto-restart Response Second Over-current threshold with Latch-off Response +400-mA/-800mA Gate Drive Current Low Start-Up and Operating Currents 20 pin SO Lead (Pb)-Free PackageUCC25710: LED driver Controller ICCurrent Regulation and VCO Slew ControlUCC

8、25710Block DiagramSupply ControlLLC ControlLED Switch and Dimming ControlFault ControlUCC25710: DIMMING LLC ON/OFF TRANSITION & CURRENT CONTROL The DIM input controls the ILED-ON an ILED-ON signals. DSR capacitor C2 and internal 44uA currents control the slew rate of VVCO during dimming off and on t

9、ransitions. Turn-off: DSR is discharged to GND by 44uA Turn-on: DSR is charged to ICOMP by 44uA. Charge level is clamped to 1Vbe above ICOMP Control Clamp output, VVCO, tracks the lower of ICOMP and DSR ICOMP is only driven by GM amp during LED-ON times. During LED-OFF times the ICOMP voltage is hel

10、d by C1GMICOMP510uS16CSVVCOVVREF15CREF17HICOMP+ILED-ONLHIDSRCH44uAIDSRDC44uAVVREF14DSRVVREFControlClampDimming Slew ControlGNDICOMP+VCLREFCLO, 0.5VVCLREFCHI, 2.8V4KCurrent Amplifierdelay2.4usVVCOILED-ON6VCCR3R2R15VREFC2C1LEDRETURNLEDSWUCC25710: START-UP & DIM WAVEFORMS 10ms RESET initiates Soft-Star

11、t (SS) LLC Soft-Start, VCO control is clamped to SS until SS ICOMP Dimming is disabled during SS DSR cap is used to limit LLC control slew rate during dimming ICOMP voltage is maintained during dimmingUCC25710: DIMMING WAVEFORMS DIM input controls LEDSW DIM input triggers soft turn-on and turn-off o

12、f LLC converter LLC on-time is extended On-time extension is proportional to 1-D, D is dimming duty-cycle Extended on-time allows ICOMP to maintain current regulation at low DUCC25710: LOW DUTY-CYLE ILLUSTRATION1.LLC reaches power level equal to pedestal LED current in region B. Power is under deliv

13、ered in region A, but is compensated for in region C2.Region B is zero, but sum of A+C still deliveries correct energy. 3.Energy delivered in region A + C is too low, loop is open and realized peak LED current will drop4.On-time is extended. A + C energy/pulse is correct to maintain same peak LED cu

14、rrentUCC25710: FAULT MANAGEMENTFaults OV highest LED string voltage UV lowest LED string voltage CL(1V) input current signal over-current CL(2V) input current signal latch-off TSD Chip thermal shutdownResponse OV, CL(1V) & TSD: The LLC converter and LEDSW are turned off. When the fault clears a RESE

15、T and SS are initiated. UV: The LLC converter and LEDSW are turned off. A RESET and SS are immediately initiated, repeatedly, until fault clears. CL(2V): The LLC and LEDSW are latched off until UVLO recycles. During RESET the LLC converter and LEDSW are OFF During SS the LLC converter and LEDSW are

16、ON, i.e. no DIMMING PMP4302A: Multi-string LLC AC/DC Driver for general LED lightingReference DesignTI PartsVinOutputTopologyEff.DimmingPMP4302A:AC input Multi-string LLC converter for general LED lightingUCC28810 (TM PFC)UCC25710(Multi-string LLC)UCC28610(Aux Flyback)90V264V54V500mA with 4 string T

17、M PFC+Multi-string LLC converter92%PWM dimmingFeaturesLowest cost than AC/DC + DC/DCHighest efficiency to 92%PWM dimming compatibleIntegrate LED open/short protection and over current protectionApplicationsGeneral LED lighting and LED backlight TVUCC28810UCC25710PMP4302A demo board Input EMIPFC Stag

18、eMulti-string LLC StageAux PowerLED light bar4x15LEDsPMP4302: Schematics for UCC25710 after PFC stagePWM dimming & Total current sensing feedbackMulti-string transformer LLC topologyPMP4302A: LED current output tolerancePWMDimmingIo1Io2Io3Io4%1%4.94.855.13.0302%109.810.410.32.9625%25.224.125.225.12.

19、20810%50.449.751.551.31.77420%100.9100.1102.7102.51.28030%151.4150.4154.1153.61.21440%201.9200.9205.1204.91.03350%252.4251.1256.4255.81.04360%302.9301.4307.73071.03370%353.5351.8358.6357.80.95680%403.9402.2409.7408.80.92390%454.3452.2461.1460.10.97399%499.3496.7507.2506.21.045100%503.9501.4512.4511.

20、71.084Current tolerance can achieve 87%0.97FeaturesSpecific transformer for T8 lighting form factor PWM dimming compatibleLow BOM costEfficiency 87% at 230Vac inputIsolated single stage w/ PF0.97 at 230Vac inputOutput over voltage protection: 45VdcOutput ripple current: 0.92 w/ wide range inputInput

21、 Voltage200V/divInput Current200mA/divPMP4301: PerformancePeak efficiency is 87.7% at 110Vac & 220VacOutput ripple current with110VAC inputOutput ripple current with 220VAC inputOutput current 50mA/divOutput voltage20V/divInput Voltage 200V/divOutput current 50mA/divOutput voltage20V/divInput Voltag

22、e 200V/div5mA (+-1%) output current tolerance PMP4304: 7W TRIAC dimming LED lighting DriverReference DesignTI PartsVinPoVoIoTopologyEff.PFAC Input 7W AC/DC LED Lighting Driver /w TRIAC dimmingTPS92210TL431180-265 Vac7W16V25V350mA(57 LEDs)Singe Stage high PF with TRIAC dimming80%0.95Features50 compon

23、ents counts with low BOM costTRIAC dimmable solutions without flickingPrimary side controls without opto-couplerConstant On-time control with high power factorApplicationsPAR20/30/38 LED LightingSmall form factor indoor Lighting36DALI Demo and Evaluation PlatformDALI PHY for MSP430TPS62260 EVM with

24、MSP2131DALI controllerApplicationsLight Bulb ReplacementAutomotive LightingStreet LightingBack LightingArea LightingOff-GridSignageFull SystemSolutionsMulti-StringSingle-StringMulti-StageSingle-StageTRIAC dimmingDigital PowerCommunicationExpertiseAnalog ControlDigital ControlWirelessDC/DCAC/DCLinear

25、LED LabResourcesEVMsCook BookRef. DesignsSample SoftwareApplication ReportsLocal Design ServicesSystem Block DiagramsTI LED Lighting Solutions Lighting Lighting Know-HowKnow-HowHighHighPerformancePerformanceSolutionS Reference Designs, Products, White Papers, Articles, Tools, Videos, etc. 39LED Refe

26、rence Design Cookbook http:/ youMajpjMVcyzj21HLfrvy96dv02lPPfYgxUS7IYmZkyEmZ0kGeYZS3bpLCkYH1lt4EK7CxmUX3ijoYSOer7ZuaVWYgz4EpZrUirVpMzzvNtf1XZw5oswSXOtFaejnOcmfE1lZgnN1RSXg8wLCG8CVQ3XPJMvodPFWcpiYJgZazNSEPNIaklYSu7qSd1UpaxmZDlpN9zW7kljfsLCLi26Yv109ffbnDH8LbUN1G6ACURQ39eG12KHL9tXsZ1jzgoCK8g1kuNOh5eFvc

27、mVT5ZYVQt9zk3rp3qLnf02FovEXxVRxjCcFRNppiJljNiOuk6fONnyX7fyGg7sXZ49BmCN5oy9VesHpKzdjTKwjrkCEQCFDehVmGax3lrOEbw63VscA3YSijtUKoCyiLzAlVRp7l4QgPNHxvJFFDyjUVN3oHlMah0XBd4uTbkfPIhHtw0evPmYOrdhEDoPwvYhzlGplU1AU9mpyiCXH8gpPCBRYjq77VcnbXumNE1yGfyTsbSj89J63kRTKDkKUg3mdS5sJ4X5cQ8dK7oW9IkScssECQdz2O9UTlpRjAFPCh

28、jhLdzopQzwxQf8ozdzOhogwAooXpUF83BX4C3jRgjDJiiXEUDMaNz4vQ4n164vspddHvOIVuBBdMA4xp1YhiHk0vOJ8TL1BxogzVlMpmod6ianYGmksQq6NWCEd56hZF4wfaNyZcrGfNxnPiG6ZAxSkfmhJAKtNmCqbRmppeXp8inz4eq3HkWCMSORyMMX522xpHG6basNr6KQfbZsFbHjzyNlJrruLolKFcC84dqfijBO5Dy2NaBcNEBPgQrT12PgpcKx2or2YChN5DPjs80zzdtdAdTKuW4uVv9bbZu3K2SZ2aEhTlIC1UqrIWibkzwHh6p8gLv26zr01mJybfOzFc4T7kQH1IpPwOzMDnAKPLsLrznXGjFNIA9bSWWms6ibKZwQIKrMzalwbFrQJvOP1rPH8rx2KkyYqrtQk5VRwM1HSX