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Automotive ExteriorLED Lighting Productswww.ti.com/autoled2015

Build Innovative, Reliable and Cost-EffectiveAutomotive Lighting SystemsIntroductionDesign Support from TIAutomotive exterior LED lighting products from Texas Instruments (TI) help you buildinnovative, reliable, cost-effective exterior automotive lighting systems that exceedtoday’s stringent requirements. Our highly efficient LED solutions extend the life of yourlighting system, enable greater driver and pedestrian safety, and enhance the driverexperience.TI offers comprehensive design tools,technical resources and direct customersupport to help you get your automotivelighting products to market faster. TI Designs – Lab-tested automotivelighting reference designs LED driver evaluation modules (EVMs) Automotive system block diagrams Application notes WEBENCH LED design tool Search for solutions and get help inthe LED driver forum in TI’s E2E CommunityFrom headlights to taillights and everything in between, TI delivers reliable, scalable andpower-efficient linear and switching solutions for simple and complex systems.Table of ContentsAutomotive Exterior LED Lighting Products22IntroductionTI Design SupportFront Lighting3567Single-Stage Front LightingAutomotive Front LightingDual-Stage Front LightingAdaptive Front LightingLED Matrix Manager8LED Matrix Manager for Adaptive Front LightingRear Lighting9Rear Lighting SolutionsSupport11122 Design Resources, References and SupportTI Worldwide Technical SupportAutomotive Exterior LED Lighting Guide 2015Texas Instruments

Single-Stage Front Lighting SelectionChoose Many Single-Stage LEDDriver SolutionsTI’s broad offering of single-stage LEDdriver solutions gives you optimumflexibility in matching the wide variationin LED load requirements with thedynamic operating range of automobileand commercial truck batteries.Single-stageautomotive frontLED lightingYesVIN VLED?NoLEDcurrent Q1TPS92690-Q16 – 42V / 75V,Hysteretic controller6 – 75V,1.5-A –75V, simplestLM3421-Q14.5–75VLM3429-Q1 Fast PWM dimLM3423-Q14.5–75VLM3421-Q1 fault flagLM3424-Q14.5–75VFrequency syncThermal fold-backTPS92601-Q14.5–40VAnalog / PWMdimmingTPS92602-Q14.5–40VDual TPS92601-Q1Texas InstrumentsAutomotive Exterior LED Lighting Guide 2015 3

Single-Stage Front Lighting SelectionFeatured ProductsSwitchingType Device4 TopologyDim MethodNo. of VIN Min VIN MaxChannels(V)(V)Buck Boost Buck-Boost Flyback SEPIC Cuk Analog PWMCurrent SenseHSLSFreq. Sync. CommentsIntegrated NFET converter1.5 A max LED currentLM3406HV-Q11675 LM3409HV-Q11675 PFET controllerLM3409-Q11642 PFET controllerLM3421-Q114.575 50–500 mV sense voltageFast PWM dimmingLM3423-Q114.575 50–500 mV sense voltageFast PWM dimmingFault flagLM3424-Q114.575 LM3429-Q114.575 TPS92601-Q114.540 15–150 mV sense voltageFast PFET PWM dimmingFault diagnosticsTPS92602-Q124.540 15–150 mV sense voltageFast PFET PWM dimmingFault diagnosticsTPS92690-Q114.575 50–500 mV sense voltgeAutomotive Exterior LED Lighting Guide 2015 50–500 mV sense voltageThermal fold-back50–500 mV sense voltge Texas Instruments

Single-Stage Front Lighting OverviewDesign Long Lasting LED LightsWithout Modifying the BCMIncandescentLampLEDLampHigh BeamAutomotive front lights are evolving fromincandescent high-intensity discharge(HID) based lamps into highly intelligentand adaptive luminaires that automatically adjust to dynamic environmental,roadway and traffic conditions.Low BeamTurnPositionCommon implementations today are amixture of both traditional filament-basedlamps and LED light sources with LEDstypically being utilized on mid- andhigh-end models or trim levels.DRLFogTI’s flexible portfolio of single/dualchannel LED drivers and developmenttools help you in the design of longlasting LED light sources for replacementof incandescent lamps without expensivemodification to existing Body ControlModules (BCMs).Regulator LED DriverMCUDiagnostics/ControlBodyControlLIN BusFlexible, Module Single Power Conversion Stage ArchitectureLEDs are not only a long-lasting, energy efficient sources of light, they also provideOEMs with creative new ways to combine lighting function with innovative styling.TI’s flexible, single-stage LED driver products are highly configurable and modularpoint-of-load solutions. They simplify matching the dynamic voltage range of modernautomotive batteries to strings ranging from 1 to “n” LEDs in length.Available in single and dual-channel options, TI’s single-stage LED drivers also canbe configured to support all common topologies. Diagnostic and protection featuresensure reliable operation under fault conditions.TI Advantages Easy to mix LED and conventional light sources without ECUmodification Flexible driver solutions forstrings of 1 to “n” LEDs Low BOM costFlexible PortfolioMeets Your NeedsConditionVLED VBATTLEDDriverBoostTopologyBoostVLED VBATTBuckVLED or erBuck-BoostTexas InstrumentsAutomotive Exterior LED Lighting Guide 2015 5

Dual-Stage Front Lighting OverviewBenefit From a Full LED Electronics Control Unit ApproachTI Advantages Boost removes VBATTfluctuations Buck LED drivers have bestimmunity to LED open or shortfaults Scalable ECU platform for staticor adaptive front lightingVehicles adopting LEDs for all exterior lighting functions can benefit from a full LEDECU platform approach based upon a dual power conversion stage architectureconsisting of a boost voltage source and buck current regulators for each lightingfunction.Buck LED drivers from Texas Instruments are ideal current sources and offer the bestimmunity to common fault conditions such as short circuits to chassis and battery. TI’sboost regulators produce stable DC input supplies for buck current source operation.BoostVoltageRegulatorsBuck LEDDriverHigh beamBuck LEDDriverLow beamBuck LEDDriverTurnBuck LEDDriverPositionBuck LEDDriverDRLBuck trolLIN BusDual-Stage Front Lighting Product Selection FlowDual-stageautomotive frontLED lightingPrimaryStageSecondaryLEDcurrent 1.5 A?TPS40211-Q14.5 - 42VSimplest V / 75V,Hysteretic controller6 Automotive Exterior LED Lighting Guide 20156–75V,1.5-A ConverterTexas Instruments

Adaptive Front Lighting OverviewFeatured ProductsSwitchingType DeviceNo. ofChannels VIN Min (V) VIN Max (V) BuckTopologyBoostFlybackDim MethodSEPICAnalogPWMCurrent SenseHSLSComments Integrated NFET converter1.5 A max LED currentLM3406HV-Q11675 LM3409HV-Q11675 PFET controllerLM3409-Q11642 PFET controllerTPS40211-Q114.552 260 mV fixed FB voltageAdaptive Front Lighting (AFL) Gives You Optimal IlluminationTraditional high-/low beam High-IntensityDischarge (HID) lamps consist of a bulband reflector to create a predefineddistribution of light. In most vehicles, theonly control for these headlamps is ONor OFF. A relative few can alter the beamdirection by rudimentary mechanicalmeans based on steering wheel position.These systems are subject to wear outmechanisms and long-term reliabilityconcerns as they rely on motors,actuators and baffles to physically steerthe headlamps.Unlike incandescent bulbs, LEDsare point sources of light. If they areTraditional Front LightingTexas Instrumentscreatively arranged and paired with asuitable control method light is easilysteered without moving parts.TI’s solid-state approach is a morereliable, dynamic and scalable meansof solving designers AFL challenges.Using speed, steering wheel position,navigation system inputs, and frontfacing cameras for vehicle and objectdetection, TI’s LED Matrix Manager forAFL enables vehicles to automaticallyadjust the distribution and intensity oflight emitted from the high/low beamswithout physical movement of theheadlamps.This capability provides alwaysoptimal roadway, shoulder and medianillumination free of common high-beamglare. The result is greater long distancevisibility at highway speeds, enhancedside visibility when cornering, andproviding the driver with an obvious overilluminated visual warning of roadwaydebris and potential animal or pedestrianhazards.Adaptive Front LightingAutomotive Exterior LED Lighting Guide 2015 7

LED Matrix Managerfor Adaptive Front LightingSimplify Your Automotive Exterior Lighting Design with theTPS92661-Q1TI Advantages Solid state – no moving partsrequired Controls up to 96 LEDs forheadlamp beam forming anddirectional control 10-bit pulse-width modulated(PWM) LED brightness controlfor pixel-level light intensityadjustment LED open/short fault diagnostics Easy integration into dual-stageECULED drivers from TI provide the ultimate flexibility for enhancing automobile stylingand safety. The TPS92661-Q1, LED Matrix Manager IC, is a compact solution withLED pixel-level brightness control and diagnostics ideally suited for adaptive high/lowbeams, sequential turn indicators and daytime running lights. This solid-state approachrequires no moving parts, increasing system reliability.LED Matrix ManagerBuck LEDDriverBoostVoltageRegulatorGlare Free High BeamLED Matrix ManagerBuck LEDDriverAdaptive Low BeamLED Matrix ManagerBuck LEDDriverBuck LEDDriverSequential TurnStatic Low BeamLED Matrix ManagerBuck LEDDriverDRL / PositionBuck trolTo matrixmanagerICsCAN velShiftersDriver with LEDFault DetectionLevelShiftersDriver with LEDFault ENLED10ADR2ADR1ADR0LED2CPPSYNCLevelShiftersDriver with LEDFault VCCDriver with LEDFault DetectionLED0Switch ArrayLED Matrix ControllerDeviceTPS92661-Q18 VINFCLK (MHz)PackageFeatures4.5–5.5V0.1–16TQFP Exp-Pad 48 pinsAEC-Q100 Grade 1 qualifiedAutomotive grade production flowAutomotive Exterior LED Lighting Guide 2015Texas Instruments

Rear Lighting: Reliable, Low EMI SolutionsGet Integrated Solutions with Full Diagnostic and Thermal Management FeaturesTI’s Linear LED driver portfolio consistsof reliable, low-EMI solutions for rearstop, turn and backup lighting. IntegratedDC/DC with linear LED drive is suitablefor long LED strings where the LEDforward voltage is greater than theminimum battery voltage. TI’s Linearsolutions offer the leading features ofLDOLDOControlControlfull diagnostic (e.g., LED open, shortand single LED short) and thermalmanagement.Boost Linear3-Ch1-ChSingle-Channel Linear Ideal for few LED pixels,high-current designs Simple building block, repeatcircuit for additional channels1-ChMulti-Channel Linear Best for designs using manyparallel, low-current LEDs Simplified fault reporting assingle IC controls multiplechannelsBoost Linear DC/DC (boost, SEPIC) buffersLED strings from battery voltagevariation under cold/warm crank Suitable for longer seriesconnected LEDsRear Lighting Product Selection FlowDC/DCLow SideLM3492HC-Q1LM3431/A-Q14.5–65V, 0.25A/Ch 2-Ch5–36V, 0.2A/Ch 3-ChTPS92630-Q15–45V, 0.15A/Ch 3-ChHigh SideTPS92638-Q1Linear5–45V, 0.07A/Ch 8-ChLow SideTypologyTexas InstrumentsCurrent SenseTL4242-Q14.5–42V, 0.5A/Ch 1-Ch1 Channel2 Channels3 Channels8 ChannelsAutomotive Exterior LED Lighting Guide 2015 9

Rear Lighting: Reliable, Low EMI SolutionsFeatured ProductsDim MethodNo. ofChannelsVIN Min(V)VIN Max(V)AnalogPWMTL4242-Q114.542 TPS92630-Q13540 HSLSComments 500 mA max current 150 mA / channelSingle LED short detectionFault detection and protectionThermal foldback 70 mA / channel4-bank PWM controlStop / tail functionFault detetion and protectionThermal current foldbackBoost LinearLinearType DeviceCurrent Sense10 TPS92638-Q18540 LM3431/A-Q134.536 3-channel boost and linear controller“A” – lower offsetLM3492-Q124.565 2-channel integrated boost and linear converter50–200 mA max / chLM3492HC-Q124.565 2-channel integrated boost and linear converter50–250 mA max / chHigh contrast ratio up to 10,000:1Automotive Exterior LED Lighting Guide 2015Texas Instruments