led reference design cookbook

4Q 2009www.ti.com/led

LED Reference Design Cookbook

LED Reference Design Cookbook TexasInstruments4Q2009

LED Reference Design Cookbook

Table of Contents

2

LED Drive Topology LED Configuration Dimming Options VIN VOUT (VDC) IOUT (mA) Device Page

Small LCD Backlight with Digital and PWM Dimming

10 series Digital or PWM 3 to 18 VDC 26 or 38 maximum 700 maximum TPS61160/1 4

Small LCD Backlight from LDO 4 parallel (2 banks of 2)

— 2.5 to 5.5 VDC 3 typical 25 per LED TPS7510x 6

Medium-Size LCD Backlight 3 series Digital or PWM 3 to 12 VDC 5 typical 350 TPS61165 8

Large-LCD Backlight Driver Up to 96 (12 series, 8 strings)

Analog or PWM 4 to 24 VDC 16 to 48 320 TPS61195 10

Constant Current Driver with PFC 3 to 13 series — 180 to 265 VAC 10 to 48.5 700 UCC28810 12

Boost Controller with PFC 80 series TRIAC dimmer 150 to 264 VAC 300 maximum 350 UCC28810 14

Replacement for Standard Lightbulb

7 to 9 series TRIAC dimmer 90 to 130 VAC 24 to 32 450 UCL64001 18

25-Watt Dimmable Driver with PFC

10 series TRIAC dimmer 85 to 305 VAC 33 to 38 700 UCC28810 20

100-Watt, Constant-Current, Non-Isolated Driver with PFC

15 to 30 series PWM 90 to 265 VAC 55 to 100 900 UCC28810 22

110-Watt, Constant-Current, Isolated Driver with PFC

7 to 15 series (up to 4 strings)

Analog or PWM 90 to 265 VAC 22 to 60 500 UCC28810 24

10-Watt, Green-Mode PWM LED Driver

3 to 6 series — 120 to 290 VAC 24 typical 350 UCL64010 26

Wireless-Controlled Triple LED Drive

3 parallel (tricolor) — 4.5 to 5.5 VDC 3 typical 300 per LED TPS62260 28

Low Voltage Buck Boost for LED Torch

1 Dual level 1.2 to 5 VDC 5 typical 600 TPS63000 30

Boost Driver with Integrated Power Switch

4 to 8 series Analog or PWM 5 to 12 VDC VIN to 38 2000 maximum TPS61500 32

Nonsynchronous Boost LED Driver

10 series (1 or 2 strings)

— 9 to 18 VDC 40 maximum 700 or 350 TPS40211 34

Wide Input DC Voltage Range SEPIC Driver

4 series — 8 to 40 VDC 13 typical 350 TPS40211 36

3-Watt Solar Lantern 3 series Analog or PWM 4.5 to 7.4 VDC 10.5 typical 350 TPS61165 38

LED Reference Design Cookbook 3

TexasInstruments4Q2009 LED Reference Design Cookbook

LED Reference Design CookbookHelpingYouSolveYourLightingDesignChallenges

TheLEDReferenceDesignCookbookisdesignedtoprovideyouwithavaluabletooltohelpyousolveyourlightingdesignneeds.CustomersseekingthelatestininnovativeandaffordableLED lightingsolutionscanbenefit fromTI’sbroadproductportfolioofAC/DC,DC/DC,LEDdrivers,powermanagementdevices,wirelessandwiredinterfacecontrolandembeddedprocessors.

Designershavetheoptionofnotonlycontrollingthepowerstage,butregulatingLEDcurrentsaswell,eliminatingtheneedformultiplecomponentsandreducingsystemcost.Systemscanbedesignedtoaccuratelycontrolvoltageandcurrentregulationforpreciselight intensity and color mixing, temperature monitoring to prevent thermal runaway,intelligent/adaptive dimming, and fault detection (over voltage/current, blown string).Communicationwithexternal systems isalsopossibleviapower-linecommunication(PLC),wirelesstechnologyorinterfaces.

LEDlightingdesignersarechallengedwithmeetingtheirefficiencyandreliabilitygoalsfasterinadvancedlightingdesigns.TI’slightingportfolioishelpingdesignersachievetheirgoalsatafasterrate.

ToseetheTIsolutionsforgenerallighting,signage,backlightingandautomotive,allcomplimentedbyacomprehensivecustomersupportnetwork,visitwww.ti.com/lighting.

TI has Solutions for Your Lighting Challenges:• Precisionchannel-to-channeland

chip-to-chipaccuracytocreatethebesthueandluminanceinyourRGBmessageboardsandvideodisplays

• Smallfootprint,highestefficiency,programmableLEDorOLEDbacklightcontrollers

• Blinkinglow-powerLEDstoactasindicatorsinanautomotivedisplayorinacasinogame

• ControllerstopoweranddimhighbrightnesswhiteorRGBLEDsforarchitecturalluminariesandportablelighting

• PoweringarraysofHBLEDsoffanACsourceforuseinstreetlightingandreplacinghigh-intensitydischarge(HID)lamps

• HighlyintegratedZigBee®transceiversandSoCsolutionsforwirelesslightingcontrolandhomeautomation


TPS61161

L1: TDK VLCF5020T-220MR75-1C1: Murata GRM188R61E105KC2: Murata GRM21BR71H105KD1: ONsemi MBR0540T1

VIN

CTRL

COMP

SW

FB

RsetR10Ω

20mA

C21µF

C11µF

L122µH

GND

D1

On/OffDimmingControl

VI 3V to 18V

C3220nF


TPS61160/1

4

Description Witha40-VintegratedswitchFET,theTPS61160/1isaboostconverterthatdrivesupto10LEDsinseries.Theboostconverter,whichallowsfortheuseofhigh-brightnessLEDsingenerallighting,runsatafixedfrequencyof1.2MHzwitha0.7-Aswitch-currentlimit.

Asshownintheschematicbelowofatypicalapplication,thedefaultwhite-LED(WLED)currentissetwiththeexternalsenseresistor,RSET,andthefeedbackvoltageisregulatedto200mV.TheLEDcurrentcanbecontrolledviatheone-wiredigitalinterface(EasyScale™protocol)throughtheCTRLpin.Alternatively,

Ordering Information1

TA Open LED Protection (typical) Package2 Package Marking

26 V TPS61160DRV BZQ–40°C to 85°C

38 V TPS61161DRV BZR

1For most current package and ordering information: www.ti.com/sc/device/TPS61160.2The DRV package is available in tape and reel. Add R suffix (TPR61160DRVR) to order quantities of 3,000 parts per reel or add T suffix

(TPS61160DRVT) to order 250 parts per reel.

integratedcircuitrytopreventtheoutputfromexceedingtheabsolutemaximumratings.

Web LinksDatasheets, user’s guides, samples:www.ti.com/sc/device/TPS61160

Typical Application Schematic

aPWMsignalcanbeappliedtotheCTRLpinsuchthatthedutycycledeterminesthefeedbackreferencevoltage.IneitherdigitalorPWMmode,theTPS61160/1doesnotprovideLEDcurrentinburst;therefore,itdoesnotgenerateaudiblenoiseontheoutputcapacitor.Forprotectionduringopen-LEDconditions,theTPS61160/1has

Formorereferencedesigns,see:www.ti.com/powerreferencedesigns



TPS61160/1

5


TPS61160/1

Ordering Information1

TA Open LED Protection (typical) Package2 Package Marking

26 V TPS61160DRV BZQ–40°C to 85°C

38 V TPS61161DRV BZR

1For most current package and ordering information: www.ti.com/sc/device/TPS61160.2The DRV package is available in tape and reel. Add R suffix (TPR61160DRVR) to order quantities of 3,000 parts per reel or add T suffix

(TPS61160DRVT) to order 250 parts per reel.

Efficiency vs. Output Current

PWM Dimming Output Ripple

PWM Dimming Linearity: FB Voltage vs. PWM Duty Cycle


Small LCD Backlight from LDO

TPS7510x

6

Description TheTPS7510xlinearlow-dropout(LDO)LEDcurrentsourceisoptimizedforlow-powerLEDbacklightingapplicationssuchaskeypadsandnavigationpads.ThedeviceprovidesaconstantcurrentforuptofourunmatchedLEDsorganizedintwobanksoftwoLEDseachinacommon-cathodetopology.Withoutanexternalresistor,thecurrentsourcedefaultstothefactory-programmable,presetcurrentlevelwith±0.5%accuracy(typical).Anoptionalexternalresistorcanbeusedtosetinitialbrightnesstouser-programmablevalueswithhigheraccuracy.BrightnesscanbevariedfromofftofullbrightnessbyinputtingaPWMsignaloneachenablepin.Eachbankhasindependentenableandbrightnesscontrol,butthecurrentsofallfourchannelsarematchedconcurrently.Theinput-supplyrangeisideallysuitedforsingle-cellLi-Ionbatterysupplies,andtheTPS7510xcanprovideupto25mAperLED.Nointernalswitchingsignalsareused,eliminatingtroublesome

Device Specifications

Device VIN LEDs ∆IDX MAX VDO ∆IDX Packages

TPS7510x 2.5 V to 5.5 V 2 mm x 2 mm 25 mA 28 mV ±2% WCSP, DSK

TPS7510x Package Options

electromagneticinterference(EMI).TheTPS7510xisofferedinanultra-small,9-ball,0.4-mmball-pitchwaferchip-scalepackage(WCSP)anda2.5x2.5-mm,10-pinSONpackage,yieldingaverycompacttotalsolutionsizeidealformobilehandsetsandportablebacklightingapplications.

Atfirstglance,usingalinearLDOcircuittodriveLEDsmayseemimpractical,giventhelinearregulator’sreputationforlowefficiency.However,theefficiencyofLDOsisoftenmisunderstood.LDOefficiencyisentirelybasedontheinput/output-voltageratio;therefore,theefficiencyofdrivingwhiteLEDs(WLEDs)canbequitehigh.Forexample,drivinga3-VWLEDfroma3.6-VLi-Ion-batteryinputtranslatesintoanLEDefficiencyof83%.

Figure 1showsatypicalapplicationfortheTPS75105.NotethatthisdevicerequiresnoexternalcomponentstodrivetheWLEDs.Thetotalsolutionisextremelysmallandverycosteffective.

Figure 2showstheTPS75105efficiencydataforseveraldifferentWLEDforwardvoltagesovertheLi-Ionbattery’srange.TheLEDefficiencyfortheTPS75105iscomparabletoorbetterthanthatofotherWLED-driversolutions.

Figure 3demonstratestheLEDefficiencyoftheTPS7510xovertheLi-Ionbattery’sdischargecurve.Theaverageefficiencyfortheentiredischargerangeisover80%forallthreecurves,andupto90%whenVLED=3.3V.




Small LCD Backlight from LDO

TPS7510x

7

Figure 2 - Efficiency Data

Figure 3 - LED Efficiency

Figure 1 - Typical Application

D1A

D2A

D1B

D2B

VIN

GND

ENA

ENB

ISET3.6VBattery

OFF

ON

OFF

Optional

ON


TPS61165

L1: TOKO #A915_Y-100MC1: Murata GRM188R61A475KC2: Murata GRM188R61E105KD1: OSRAM LW-W 5SM

VIN

CTRL FB

COMP

SW

RsetR57Ω

350mA

C21µF

C11µF

L110µH

GND

D1

On/OffDimmingControl

VIN 5V

C3220nF

Medium-Size LCD Backlight

TPS61165

8

Description Witha40-VintegratedswitchFET,theTPS61165isaboostconverterthatdrivesuptotenLEDsinseries.Theboostconverter,whichallowsfortheuseofhigh-brightnessLEDsingenerallighting,runsatafixedfrequencyof1.2MHzwitha0.7-Aswitch-currentlimit.

Asshownintheschematicbelowofatypicalapplication,thedefaultwhite-LED(WLED)currentissetwiththeexternalsenseresistor,RSET,andthefeedbackvoltageisregulatedto200mV.TheLEDcurrentcanbecontrolledviatheone-wiredigitalinterface(EasyScale™protocol)throughtheCTRLpin.Alternatively,aPWMsignalcanbeappliedtothe

TheTPS61165isavailableinaspace-saving,2x2-mmQFNpackagewithathermalpad.



LED Current vs. Input Supply and LED Number

Input Supply 3 V 5 V 12 V

LED number 3 200 mA 350 mA 820 mA



Note: Assumption that LED forward voltage is 3.5 V, and TPS61165’s conversion efficiency is 80%.

CTRLpinsuchthatthedutycycledeterminesthefeedbackreferencevoltage.IneitherdigitalorPWMmode,theTPS61160/1doesnotprovideLEDcurrentinburst;therefore,itdoesnotgenerateaudiblenoiseontheoutputcapacitor.Forprotectionduringopen-LEDconditions,theTPS61165hasintegratedcircuitrytopreventtheoutputfromexceedingtheabsolutemaximumratings.



Medium-Size LCD Backlight

TPS61165

9


PWM Dimming Linearity: FB Voltage vs. PWM Duty Cycle

PWM Dimming Output Ripple

Startup


Large-LCD Backlight Driver

TPS61195

10

Description TheTPS61195provideshighlyintegratedsolutionsforlarge-LCDbacklights.Thisdevicehasabuilt-in,high-efficiencyboostregulatorwithanintegrated3-A,50-VpowerMOSFET.Theeightcurrent-sinkregulatorsprovidehigh-precisioncurrentregulationandmatching.Intotal,thedevicecansupportupto96whiteLEDs(WLEDs).Inaddition,theboostoutputautomaticallyadjustsitsvoltagetotheWLEDforwardvoltagetoimproveefficiency.

TheTPS61195supportsmultiplebrightness-dimmingmethods.DuringdirectPWMdimming,theWLEDcurrentisturnedon/offatthedutycycle,andthefrequencyisdeterminedbyanintegratedPWMsignal.InPWM-dimmingmode,thefrequencyofthissignalisresistor-programmable,whilethedutycycleiscontrolledfromanexternalPWMsignalinputfromaPWMpin.Inanalogmixeddimmingmodes,theinputPWMduty-cycleinformation

TPS61195 Schematic


Parameter Minimum Maximum Unit

Input voltage 4.0 24 Volts

Output voltage 16 48 Volts

Number of channel — 8 —

Output current 0 0.32 Amp

Switching frequency 600 KHz 1 MHz —

TPS61195

VIN

4v ~ 24V

C14.7µF

C20.1µF

R240KΩ

R165KΩ

R4953KΩ

R646.4KΩ

R51M

C31µF

Up to 48VD1

R3523KΩ

200 Hz

L110µH

* 510Kohms resistance to ground.

SEL

VDDIO

Open

GND

R*

Interface

SMBus

PWM

PWM

PWM

DimmingMode

PWM

D-PWM

PWM

Mix Mode

AGND

VIN VIN

VDDIO PGND1PGND2

OVP

FDIM

IFB1IFB2IFB3IFB4IFB5IFB6IFB7IFB8

EN

DPWM

FDPWM

FSW

SEL

ISET

SDA

SCL

istranslatedintoananalogsignaltocontroltheWLEDcurrentsignallinearlyoverabrightnessareaof12.5to100%.ThedevicealsoallowsPWMdimmingtobeaddedwhentheanalogsignalkeepstheWLEDcurrentdownto12.5%.Below12.5%,theanalogsignalwillbetranslatedintoPWMduty-cycleinformationtocontroltheon/offoftheWLEDcurrentandtoaveragetheWLEDcurrentdownto1%.

TheTPS61195integratesovercurrentprotection,short-circuitprotection,softstartandovertemperatureshutdown.Thedevicealsoprovides

programmableoutputovervoltageprotection,andthethresholdisadjustedbyanexternalresistor/dividercombination.

TheTPS61195hasabuilt-inlinearregulatorfortheICsupplyandisavailableina4x4-mmQFNpackage.

Web LinksReference designs:www.ti.com/powerreferencedesigns

Datasheets, user’s guides, samples:www.ti.com/sc/device/TPS61195


11

Dimming Efficiency VIN = 10.8 V; 9s8p

PWM Dimming Current Linearity VIN = 10.8 V Mixed Mode Dimming Waveform: 8% Brightness Mode

Mix Mode Dimming Current Linearity VIN = 10.8 V

Mixed Mode Dimming Waveform: 20% Brightness— Pure Analog

Large-LCD Backlight Driver

TPS61195


Constant Current Driver with PFC

UCC28810 PMP4501

12

Description ThePMP4501isanisolated,off-line,AC-to-DCLED-currentdriverwithPFCforapplicationssuchascommercialfixturelightingandgeneralisolatedLEDdrivers.ThePMP4501isasingle-stageflybackPFCconverterthatdeliversupto34Wwitha180-to265-VACinputvoltagewhileprovidinga10-to48-Voutputvoltageataconstantoutputcurrentof700mA±2%.

ThePMP4501implementssecondary-sidecurrentcontrolfortheLEDstring.Overvoltageprotection

Web LinksDatasheets, user’s guides, samples:www.ti.com/sc/device/UCC28810

PMP4501 Reference Design Schematic

L11mH

D1DF06S

C10.1µF

L220mHT

P1

TP

2

C30.15µF275VAC 3

2

4

1

F11A/250V

C11µ

C922nF

C14DNP

R1911K

R141.5M

R91.5M

R1100K

R4100K

R710K

Q1PZT2222A

R82.2

D2BYG10M

D3BYG10M

R6100K

C6100µF

25V

C11.1µ

C1210pF

R106.98K

R22330

R2047.5K

R2147.5K

R230.82

4

3

32

56

7

8

12

A

5

4

7

8

2

1

9

10

1

4

1

2

R1610

+C747µF63V

D4S1KB

D6BAS16

D815V

D7MURA140T3

D11MBR0520L

U3TCMT1107

D13BAW56

D1212V

D9MURA120T3

D5PDU540-13

T1G094010LF

+

R222KR322K

C210nF

C1047µF35V

C81000pF Y1

Q3 3904

+

C4470µF

63V

+ C5470µF63V

+

C1547µF35V

C161µF

R2710K

R2610K

R283.32K

R242.21K

R111K

R1223.7K

R131K

R50.15

J110V...48V . 700mAGND

U1:BTL103WID

R172.49K

D1051V

TP3

TP5

TP4

R2510K

U1:ATL103WID

C17220µF

C131µ

+

Q2STB7NK80ZT4

U2UCC28810D

8765

1234

VDDGDRV

GNDTZE

VSNSEAOUTVINSISNS

R1810K

For Test PurposeOnly. R17=50Ω

preventsdangerousoutputvoltagesfromoccurringduringopen-stringconditions.Acurrent-senseamplifierreducesthesensingresistor’spowerdissipation,thusincreasingoverallefficiency.TheinternalreferencevoltageoftheoperationalamplifierachievesexcellentLED-currentregulationversusoutputpowerandinputvoltage.ThePMP4501achieveshighefficiency(90%peak),highpowerdensityandahighpowerfactor.ThereferencedesignprotectsagainstscenarioswithopenandshortLEDstrings,andthecontrolstageisasimpleandrobustdesign.


Design Specifications

Description Parts

VIN (AC)

Range

VOUT (DC)

RangeNumber of LEDs

IOUT (max)

POUT (max) Eff. PFC ISO

Dimming In

Dimming Out EVM

UCC28810 PMP4501 34-W

UCC28810 180 10 V

3-13 700 mA 34 W 89% Yes Yes No NoReference

DesignSecondary side current loop TL103W 265 48.5 V


Constant Current Driver with PFC

UCC28810 PMP4501

13

PMP4501 Board

Efficiency vs. Rectified-Equivalent Line Voltage and Output Power

Output Current Ripple. Input Voltage = 230 VAC, Output Voltage = 48 V @ 700 mA

Power Factor vs. Line Voltage and Output Power AC Input Current and Voltage at Full Load and Nominal Input Voltage

IOUT Regulation vs. Rectified-Equivalent Line Voltage and Output Power


Boost Controller with PFC

UCC28810 PMP3976

14

Description ThePMP3976circuitshownbelowwasdesignedforacommercialLEDlightingfixture.TheSEPICtopologyhastheadvantageoveraflybackconverterinthatitclampstheswitchingwaveformsonthepowersemiconductor,allowingtheuseoflowervoltageandhencemoreefficientparts.Thisprovidesanestimated2%improvementinefficiencyinthisapplication.Additionally,thereislessringingintheSEPIC,makingEMIfilteringeasier.

TheLED-lightingcircuitusestheUCC28810transition-modeboostcontrollertoshapetheinput-currentwaveform.ThecircuitstartsbychargingC6offtheline.Oncethecontrollerisrunning,itspowerisprovidedbyanauxiliarywindingontheSEPICinductor.ArelativelylargeoutputcapacitorlimitsLEDripplecurrentto20%oftheDCcurrent.Asasidenote,theACfluxandcurrents

PMP3976 Schematic


Parameter Minimum Typical Maximum Unit

Input voltage 150 — 264 VAC

Output voltage — — 300 Volts

Output current — 0.350 — Amp

inthetransition-modeSEPICarequitehigh,soLitzwireandlow-losscorematerialarerequiredtoreduceinductorlosses.

Thefollowingmaterialpresentslabresultsfromaprototypethatwasbuilttomatchtheschematic.EfficiencyisquitehighovertheEuropeanlinerange,peakingat92%.Thisgoodefficiencywasachievedbylimitingtheringingonthepowersemiconductors.Also,ascanbeseenfromthecurrentwaveform,thepowerfactorisquitegoodatover96%.Interestingly,thewaveformisnotpurelysinusoidalbutshowssomesteepnessontherising

andfallingedges.Thisisbecausethecircuitmeasuresswitchcurrentbutnotinputcurrent.However,thewaveformisgoodenoughtopasstheEuropeanrequirementsforharmoniccurrents.


Reference designs:www.ti.com/powerreferencedesigns

++

+

U2UCC28810D

HS1

Q3SPP06N80C3

150VAC to 240VAC Input

LINE

NTRL

F11.6A/250V

RT12.5Ω

C1020.22µ

C1010.22µF

L14mH

R41.1 MEG0.25W

R111.1 MEG0.25W

R1515K

C100100pF

C121000pF

C4100pF C5

0.1µF

C6100µF25V

C1010pF

C81000pF

R13100K

R6100K

TP5R21 511

TP6

TP2

TP4

J1+LED

–LED

U1TLV431AIDBZ

R8100K

R20100K

R1815K

R17 301 R190.51W

R1200K0.25W

C20.22µF

T1750µH

C1 0.47µF

R3200K0.25W R23

20

R100 10

R12 1K

D100 MMSD914

R1015K

R101100K0.5W

C3330µF

R102100K0.5W

C71000pF

Q2MMBT3904

Q1MMBT2907

D4180V

R23.61W

D5180V

R9100K

R7 200K

R5 49.9K

D3 MMSD914

D1 MUR8100E

R161K

C922µF

C112.2µF

D2KBP06G

+

–4

2

1

3AC

AC

34

21

1

1 1

1

1 1

1

1 1

1

1

1

12

3

1

1

1

1

11

2

4

5

0

8

7

1

1

1

VCCDRVGNDZCD

VSNSCOMPMULTINCS

8765

1234

TP1

TP3



UCC28810 PMP3976

15

PMP3976 Rev B Demo Board Power Factor

The circuit is built on a PMP3976 Rev A PWB.

++

+

U2UCC28810D

HS1

Q3SPP06N80C3

150VAC to 240VAC Input

LINE

NTRL

F11.6A/250V

RT12.5Ω

C1020.22µ

C1010.22µF

L14mH

R41.1 MEG0.25W

R111.1 MEG0.25W

R1515K

C100100pF

C121000pF

C4100pF C5

0.1µF

C6100µF25V

C1010pF

C81000pF

R13100K

R6100K

TP5R21 511

TP6

TP2

TP4

J1+LED

–LED

U1TLV431AIDBZ

R8100K

R20100K

R1815K

R17 301 R190.51W

R1200K0.25W

C20.22µF

T1750µH

C1 0.47µF

R3200K0.25W R23

20

R100 10

R12 1K

D100 MMSD914

R1015K

R101100K0.5W

C3330µF

R102100K0.5W

C71000pF

Q2MMBT3904

Q1MMBT2907

D4180V

R23.61W

D5180V

R9100K

R7 200K

R5 49.9K

D3 MMSD914

D1 MUR8100E

R161K

C922µF

C112.2µF

D2KBP06G

+

–4

2

1

3AC

AC

34

21

1

1 1

1

1 1

1

1 1

1

1

1

12

3

1

1

1

1

11

2

4

5

0

8

7

1

1

1

VCCDRVGNDZCD

VSNSCOMPMULTINCS

8765

1234

TP1

TP3

LED Cookbook TexasInstruments4Q2009

16


UCC28810 PMP3976Harmonic Content

The image above shows a thermal image of the board. The ambient temperature was 26ºC with no forced air flow. The input was 230 VAC.


Load Current: Current in the LED String with a 230 VAC input

Efficiency and Power Factor

Efficiency Harmonic Content

The harmonic content and the EN61000-3-2 Class C (lighting equipments) Limits are shown above; input voltage was set to 230 VAC.

IOUT VOUT VIN LIN PF POUT LossesEfficiency

%

0.349 245.5 150.4 0.646 0.983 85.65 9.827 89.7

0.349 245.4 176.4 0.544 0.980 85.64 8.398 91.1

0.349 245.3 202.6 0.473 0.979 85.61 8.208 91.3

0.350 245.3 226.3 0.430 0.975 85.86 9.201 90.5

0.350 245.3 248.4 0.399 0.969 85.86 10.184 89.4

0.350 245.3 265.7 0.378 0.962 85.86 10.763 88.9

IOUT VOUT VIN LIN PF POUT LossesEfficiency

%

0.348 303.9 149.9 0.803 0.988 105.75 13.168 88.9

0.349 303.3 175.2 0.677 0.983 105.85 10.742 90.8

0.349 303.8 199.9 0.588 0.984 106.03 9.634 91.7

0.349 303.3 224.8 0.527 0.983 105.85 10.604 90.9

0.349 303.2 249.8 0.482 0.978 105.82 11.938 89.9

0.349 303.0 264.2 0.461 0.975 105.75 13.004 89.0



UCC28810 PMP3976

17

Frequency Response

MOSFET Voltage Waveform

The frequency response of the feedback loop is shown in the plot above. The input was set to 220 VAC. The lower gain plot was taken with a 300 V output. The upper gain plot was taken with a 250 V output.

The image above shows the drain-to-source voltage on Q3. The input was set to 250.

Line Voltage and Current Waveform

The image above shows the input voltage and current. The input voltage was 230 VAC.

Diode Voltage Waveform

Inductor Winding Currents

The image above shows the voltage on the anode of D1. The input was set to 250 VDC.

The two images above show the currents in the individual windings of the inductor.



UCL64001 PMP4981

18

Description ThePMP4981isareferencedesignforanLEDdriverinalightbulb-replacementcircuit.ThedesignisoptimizedtofunctionwithACinputsourcesthatmaybefedthroughanindustry-standardTRIAC-basedphase-cutdimmer.ThePMP4981’sdimmingfunctionallowsthestringof

Web LinksDatasheets, user’s guides, samples:www.ti.com/sc/device/UCL64001

PMP4981 Schematic


Description Parts

VIN (AC)

Range

VOUT (DC)

RangeNumber of LEDs

IOUT (max)


Dimming In

Dimming Out EVM

PMP4885 low- cost offline

UCL64001 90 247 to 9 450 mA 12 W 79% No No TRIAC PWM Paper

LED lighting driver TLC372 130 32

LEDstobedimmedtoverylowlevelswithoutflickeringorstroboscopiceffects.CurrentisdrawnfromtheTRIAConlywhenneeded,providinghighefficiencywithanon-isolateddriverforavery-low-costsolution.Thissinglestageprovideshighreliability,longlifeandhighperformance.

+

U1UCL64001

L2470µ

R230

L11.2mH

+

VDD

R910K

D2MURA120T3

D1MURA120

D412V

D5301V Q2

FQT4N25

Q1FZT757A

R710KTP8

TP1

TP4

TP7

TP2

LED+LED–

R61R81

R121K

R410

R3301K

R52K

C6100p

C7.01U

C10.01µ

R1028K

C91000P

C1.1µ

R11100K

C8.01µ

C34.7µF

C20.1UC5

1µFR12.10K

C11.01µ

C131.0U

U2:ATLC372CD

VDD

REF

REF

20 VACTRIAC Dimmer

TP3

TP6TP5

C40.047µF

200V

C150.01µF

200V

3

1

1234

8765

56

7

+

–

2

4AC

AC

D3RH04-T

FBSSRT1RT2

REFVDDOUTGND

8

4

1

C121.0µ

D7 15V

D615V

R1940.2K

R1640.2K

R15200KR17

560

Q3BF720

Q43906

R188.06K

TP9

C141µ

U2:BTLC372CD




UCL64001 PMP4981

19

Line Current and Voltage – Dimmer at Full Power Position

LED Current and Voltage – Dimmer at Full Power Position Rectified AC (Top) and LED Current (Bottom) — High Conduction Angle

Line Current and Voltage – Dimmer at ~ Half Power Position Rectified AC (Top) and LED Current (Bottom) — Low Conduction Angle

LED Current and Voltage – Dimmer at Half Power Position



UCC28810/UCC28810EVM-001

20

Description TheUCC28810EVM-001evaluationmodule(EVM)isa25-WTRIACdimmableandsingle-stageflybackconverterwithPFC.TheUCC28810EVM-001providesapproximately36Vataconstant700-mA(undimmednominal)loadcurrenttopowerastringofhigh-brightnessLEDs.ThisEVMallowstheevaluationoftheUCC28810LEDlightingcontrollerinanapplicationwhereLEDscanbeusedforgeneralilluminationapplicationsthatrequiredimming.

basedwalldimmers.Noextraresistanceisusedacrossthelineorinseriesthatwouldreduceefficiency.ValleyswitchingisimplementedintheUCC28810EVM-001toimproveefficiency.Afaststart-upcircuitisalsoimplemented,sothereisnoperceiveddelayfromswitchingtoillumination.


Datasheets, user’s guides, samples:www.ti.com/sc/device/UCC28810

EVM:www.ti.com/ucc28810evm-001

UCC28810EVM-001 Block Diagram


Description Parts

VIN (AC)

Range

VOUT (DC)

RangeNumber of LEDs

IOUT (max)


Dimming In

Dimming Out EVM

UCC28810 EVM001 25-W

UCC28810 85

33 10 700 mA 25 W 89% Yes Yes TRIAC Linear YesPFC dimmable LED driver TPS3808 305

UsingtheUCC28810transition-modeboostICwithPFCinaflybackconverteryieldsavalley-switchingdesignthatcanachieve90%efficiencyandahighpowerfactoroverauniversalwideinput-voltagerange.TheUCC28810EVM-001alsooperatesoverauniversalwideinput-voltagerange.High-performanceTRIACdimmingdetectionandregulationadjustmentareachievedwithminimalimpactonefficiency.

Aninput-filterdampingnetworkensuresoperationswithmostTRIAC-

VSENSE

UCC28810

EAOUT

VINS

ISENSE

1

2

3

4

8

7

6

5

VDD

Dimmer

GDRV

GND

TZE

Input Filter and Bridge

High Voltage Startup

ZeroEnergyDetect

PrimaryBias

SecondaryBias

CurrentEA

Voltage LimitEA

Triac Dimming Detection



UCC28810/UCC28810EVM-001

21

Efficiency vs. Line Voltage

Load current as a function of line voltage. 10 Cree XLamp® 7090 XR-E, white, 700 mA LEDs connected in series was used for the load.

Triac Dimming Detection Circuit Waveforms – Deep Dimming

Power Factor vs. Line Voltage

Total Harmonic Distortion vs. Line Voltage Triac Dimming Detection Circuit Waveforms – Light Dimming

Output Current vs. Line Voltage

Efficiency as a function of line voltage. 10 Cree XLamp® 7090 XR-E, white, 700 mA LEDs connected in series was used for the load.

Power factor as a function of line voltage.10 Cree XLamp® 7090 XR-E, white, 700 mA LEDs connected in series was used for the load.

Total harmonic distortion as a function of line voltage. 10 Cree XLamp® 7090 XR-E, white, 700 mA LEDs connected in series was used for the load.



UCC28810/UCC28810EVM-002

22

Description TheUCC28810EVM-002evaluationmodule(EVM)isaconstant-currentnon-isolatedpowersupplyforLEDlightingapplicationsthatrequirehighbrightness,suchasstreet,parkingorarealighting.Thereferencedesignconvertstheuniversalmains(90to265VRMS)toa0.9-Aconstant-currentsourcetodrivea100-WLEDload.TheUCC28810EVM-002isatwo-stagedesign.

Thefirststageisatransition-modecircuitwithPFC.Itensuresthatthedesignmeetstheharmonic-currentorpower-factorrequirementsset

PFCoutputvoltagetoafixed0.9-AcurrenttodriveanLEDload.ThesecondstageacceptsPWMdimminginputs(eitherexternallyorfromanonboardcircuit)andappropriatelytogglesitselfonorofftoachievePWMdimmingoftheLEDcurrent.


Reference designs:www.ti.com/powerreferencedesigns




Description Parts

VIN (AC)

Range

VOUT (DC)

RangeNumber of LEDs

IOUT (max)


Dimming In

Dimming Out EVM

UCC28810 EVM002 100-W

UCC28810 90 5515-30 900 mA 100 W 93% Yes No PWM PWM Yes

LED lighting driver UCC28811 265 100

byvariousstandardssuchastheEN61000-3-2.ThePFCcircuitconvertstheACinputtoaregulatedDCvoltage.ThisDCvoltagecanbeconfiguredasaboost-followerPFCorafixedoutputvoltage.Theboost-followerPFCtrackstheACinput’speakvoltageforincreasedefficiencyatlow-lineoperation.TheconfigurationwithfixedoutputvoltageremovesthetrackingelementofthePFCcircuit.ThePFC’sDCoutputvoltageisthenregulatedtoafixedvalueintheregionof396VDC.

Thesecondstageofthedesignalsousestransitionmodebutisconfiguredasabuckconverter.Itconvertsthe

PFC Boost

Enable

BiasBias

PFC Output

LED PWMInput

Critical Conduction ModeLow Side Buck Current Source

PrimaryGnd

UCC28810

TZE

VDD

GDRV

ISENSE

GND

EAOUT

VINS

VSENSE

6

2

3

1

5

8

7

4

UCC28811

VDD

GDRV

GND

TZE

VSENSE

EAOUT

VINS

ISENSE

1

2

3

4

8

7

6

5



UCC28810/UCC28810EVM-002

23


UCC28810/UCC28810EVM-002Efficiency vs. Line Voltage

UCC28810EVM-002 transition mode buck PWM response (expanded). Ch1: LED VOUT, Ch2 PWM, Ch3 buck inductor current 500 mA/Div, Ch4 VDS Ch1 and Ch4 Share GND reference.

Output Current vs. Line Voltage

UCC28810EVM-002 efficiency and power factor vs. line voltage 30 Cree XRE LED’s at 900 mA.

LED current regulation as a function of line voltage.

Power Factor vs. Line Voltage Line Regulation 30 LEDs at 900 mA, (98 W)

Total Harmonic Distortion vs. Line Voltage

UCC28810EVM-002 THD vs. line voltage 30 Cree XRE LED’s at 900 mA.

UCC28810EVM-002 transition mode buck PWM response. Ch1: Buck VIN, Ch2: Buck VDS, Ch3: LED current (0.5 A/Div), Ch4: LED voltage. Ch1 and Ch4 share GND reference.


24


UCC28810/UCC28810EVM-003Description TheUCC28810EVM-003evaluationmodule(EVM)isanoff-lineAC-to-DCLEDcurrentdriverwithPFCforapplicationssuchasstreet,high-bay,andmedium-orlarge-infrastructurelighting.TheUCC28810EVM-003isathree-stageconverterdesignthatdeliversupto110W.Thefirststageisauniversalinputboost-PFCcircuitprovidinga305-to400-VDCoutput.Thesecondstageisalow-sidebuckcircuitprovidingthecontrolledcurrentsource,andthethirdstageisaseriesoftwohalf-bridgeDC/DCtransformersthatprovidesisolationofmultipleLEDstrings.Thispatent-pendingsolutionprovidesaneasilyscalableandcost-effectivemethodofdrivingmultipleLEDstrings.



Description Parts

VIN (AC)

Range

VOUT (DC)

RangeNumber of LEDs

IOUT (max)


Dimming In

Dimming Out EVM

UCC28810 EVM003 100-Wisolated multi-string LED lightingdriver w/multiple transformers

UCC28810

UCC28811

UCC25600

90, 265 22 V, 60 V 4X (7 - 15) 500 mA 110 W 91% Yes Yes PWM PWM Jul-09

TheUCC28810EVM-003implementssingle-referencecurrentcontrolanduniversaldimming(viaAMorPWM)forallLEDs.ThereferencedesigneffectivelydrivesalargenumberofLEDsconnectedinseries,butthevoltageontheLEDstringsissafe(low)andisolatedfromtheACline.ThemultistringarchitectureimplementedbytheUCC28810EVM-003ismorecost-effectivethananarchitecturewithaconstantvoltageplusabuckstageforeachLEDstring.TheLED-driverarchitectureimplementedintheUCC28810EVM-003referencedesignisreadilyscalabletoveryhighpowerlevels.ExcellentLEDcurrentmatchingbetweenstringsisachievedwiththisarchitecture.TheUCC28810EVM-003achieveshighefficiency(91%),high

powerdensityandahighpowerfactor.Thecontrolstageisasimpleandrobustdesign,andtheEVMprotectsagainstscenarioswithopenandshortLEDstrings.


Datasheets, user’s guides, samples:www.ti.com/sc/device/UCC28810


PFC Boost Follower

Enable

+50 - 60V

+50 - 60V+50 - 60V

+50 - 60V

BiasBias

Bias

PFC Output

LED PWMInput


PrimaryGnd

UCC28810

TZE

VDD

GDRV

ISENSE

GND

EAOUT

VINS

VSENSE

6

2

3

1

5

8

7

4

UCC28811

VDD

GDRV

GND

TZE

VSENSE

EAOUT

VINS

ISENSE

1

2

3

4

8

7

6

5

UCL63000VCC

GD1

GND

GD2

RT

DT

SS


25


UCC28810/UCC28810EVM-003Efficiency vs. Line Voltage

UCC28810EVM-003 IOUT matching vs. line voltage 4 x 15 Cree XRE LED’s at 500 mA.

Ch1: VBUCK+, Ch2: Buck VDS, Ch3: AC line current 1A/Div, Ch4: VBUCK - Ch1 and Ch 4 share GND reference.

Power Factor vs. Line Voltage UCC28810EVM-003 AC Input Current During PWM Dimming

IOUT Matching vs. Line Voltage

UCC28810EVM-003 efficiency vs. line voltage and load 4 x 15 Cree XRE LED’s at 500 mA.

UCC28810EVM-003 power factor vs. line voltage 4 x 15 Cree XRE LED’s at 500 mA.

PFC Boost Follower

Enable

+50 - 60V

+50 - 60V+50 - 60V

+50 - 60V

BiasBias

Bias

PFC Output

LED PWMInput


PrimaryGnd

UCC28810

TZE

VDD

GDRV

ISENSE

GND

EAOUT

VINS

VSENSE

6

2

3

1

5

8

7

4

UCC28811

VDD

GDRV

GND

TZE

VSENSE

EAOUT

VINS

ISENSE

1

2

3

4

8

7

6

5

UCL63000VCC

GD1

GND

GD2

RT

DT

SS



UCL64010 PMP3522

26

Description ThePMP3522isareferencedesignthatutilizestheUCL64010highefficiencyLEDlightingdrivercontroller.

Residentialdownlightinghasseenagreatdealoftransitiontomoreefficientsourcesoflight.CompactCFLshavebecomeamainstayinresidentiallighting,butasthelifetimecostofLEDlampsfalls,allthemorelow-power,small-form-factordesigns

Web LinksDatasheets, user’s guides, samples:www.ti.com/sc/device/UCL64010

PMP3522 Schematic



Input voltage 120 — 290 VAC



UCL64010

C101nF

C20.1µF

C510µF

C60.1µF

D2BZX84C20T

C10.047µF275VAC

R8

10

R7100K

Q1FCD4N60

L3180µH

J2

R90.1

R126.11K

R133.3

R143.3

3 - 6 LEDs @ 350mALET RTN

R11100

C7

0.1µF

R10100 Q2

MMBT3904LT1

R4100

R3220K

R2220K

R1220K

TP2

D6BAT54S

D3MMBD4148

C9470µF

C1110µF

D4MURA160T3

D5BZX84C27T

R1533.2K

C31nF

C447nF

LPMVSDVDD

GD

1

2

3

4

1

2 AC

AC

8

7

6

5

1 2

2

1

3 4

SSFBPCSGND

L11mH

F10.5A

D1RH05-T

AC IN120 - 290VAC

J1

L21mH +

+

+

+ +

willbeneeded.Thisreferencedesignisanunder-10-W,non-isolatedSEPICLEDdriverspecificallylaidoutforresidentialdownlighting.




UCL64010 PMP3522

27

Laid Out for Bulb Replacement

Regulation

Efficiency

Control Loop Frequency


Wireless-Controlled Triple LED Driver

TPS62260 TPS62260LED

28

Description Residentialandcommerciallightingcantakeadvantageoftheadditivecolormixingofred,greenandblueLEDs.ThisreferencedesigndemonstrateshowtoremotelymanagethecoloroutputofanLEDlampwithalow-powerwirelesscontroller.ThecolorisgeneratedbythreeLEDs(red,greenandblue).AnMSP430™ultralow-powermicrocontrollercontrolsthebrightnessofeachLEDwithconstantcurrentgeneratedbythreeTPS62260buckconverters,oneforeachLED.

Thecolorlook-uptabletakestheformofanarraystoredintheMSP430.Whenevertherotaryencoderisturned,newred,greenandbluevaluesarereadfromthearrayandusedtogeneratethethreePWMoutputsignals.Currently252valuesarestored,whichcanbechangedifdesired.Adecimalvalueof100

IfadesignerpreferstoreprogramtheMSP430,aseparateMSP430flashemulationtoolcanbeordered,suchastheMSP-FET430UIF.MoreinformationontheeZ430-RF2500andMSP-FET430UIFtoolscanbefoundrespectivelyat:http://focus.ti.com/docs/toolsw/folders/print/ez430-rf2500.html andhttp://focus.ti.com/docs/toolsw/folders/print/msp-fet430uif.html


EVM:www.ti.com/tps62260led-338

TPS62260LED-338 Schematic



Input voltage 4.5 5 5.5 VDC


U1MSP430F2131RGE

NCVSSXOUT/P2.7/CA7XIN/P2.6/CA6NM /RSTP2.0/ACLK/CA2P2.1/INCLK/CA3P2.2/CAOUT/TA0/C44P1.4/SMCLK/TCKNCP2.3/TA1/CA0P2.4/TA2.CA1NC PwPd

P2.5/CA5VCC

TESTP1.7/TA2/TDO/TDI

P1.6/TA1/TDI/TCLKNC

P1.5/TA0/TMS

P1.3/TA2P1.3/TA1P1.1/TA0

P1.0/TACLK

123456789

101112

2468

101214

654321

135791113

JP1

NET-DIMM_LED1NET-DIMM_LED2NET-DIMM_LED3NET-EN

242322212019181716151413

3.3V

3.3V

3.3V

R6100K

R3100K

R4100K

C310n

S1

R547K

C2100n

3.3V

JP2

eZ430=RF Connector

switchestheLEDoff,andavalueof65535producesamark-spaceratioof100%.Whenthe5-Vsupplyisapplied,thedesigngoesintoademonstrationmodewherethevaluesstoredinthearrayarereadandoutputinsequenceinaninfiniteloop.Assoonastherotaryencoderisturned,thesequencestopsandaparticularfixedcolorvaluecanbeselected.

ThereisapinheaderthatcanbeusedtoplugintheRFboardfromtheMSP430WirelessDevelopmentTool(theeZ430-RF2500),whichisseparatelyavailable.Withthisadditionalmodule,thelamp’scolorscanbecontrolledremotelyviathewirelessRFinterface.



Wireless-Controlled Triple LED Driver

TPS62260 TPS62260LED

29

Red LED

Green LED

Blue LED



Input voltage 4.5 5 5.5 VDC


U11TPS62260DRV

red

<1206>

C1222µF

R122

R1110K

R1310K

D14

D13

TS4148RY

C114.7µF

1

C134.7µF ???mV

TP11

GNDVINEN

SWMODE

FBPwPd

654

123

7

TP12

TP13

VIN

L11

NET-DIMM_LED1

+5V

NET-EN

U21TPS62260DRV

green

<1206>

C2222µF

R222

R2110K

R2310K

D24

D23

TS4148RY

C214.7µF

1

C234.7µF ???mV

TP21

GNDVINEN

SWMODE

FBPwPd

654

123

7

TP22

TP23

VIN

L21

NET-DIMM_LED2

+5V

NET-EN

C14.7µF

D1BZX84-C3V3

C422µF

R2330

VINmax < 6V

+5VJ1123

3.3V

U31TPS62260DRV

blue

<1206>

C3222µF

R322

R3110K

R3310K

D34

D33

TS4148RY

C314.7µF

1

C334.7µF ???mV

TP31

GNDVINEN

SWMODE

FBPwPd

654

123

7

TP32

TP33

VIN

L31

NET-DIMM_LED3

+5V

NET-EN



TPS63000 PMP3038

30

Description TheTPS63000providesapower-supplysolutionforproductsthatuseatwo-orthree-cellalkaline,NiCdorNiMHbattery,oraone-cellLi-IonorLi-Polymerbattery.Thebuck-boostconverterisbasedonafixed-frequencyPWMcontrollerthatusessynchronousrectificationtoobtainmaximumefficiency.Themaximumaveragecurrentintheswitchesislimitedtoatypicalvalueof1800mA,andtheconvertercanbedisabledtominimizebatterydrain.Duringshutdown,theloadisdisconnectedfromthebattery.Thedeviceispackagedina10-pinQFNPowerPAD™(DRC)packagemeasuring3x3-mm.

LED.TheTPS63000canboostfromvoltagesaslowas1.2V.AswitchthatbringsR4intooroutofthefeedbackloopprovidesadimmingmechanismfortheflashlighttotogglebetween300and600mA.


PMP3038 Schematic


Parameter Minimum Maximum Unit

Input voltage 1.2 5 VDC

Output voltage — 5 Volts

Output current 300 600 mAmp

Switch frequency — 1.5 MHz

+

U1TPS63000DRC

S1

NO

1.5V x 2BAT

C310µF

C41000pF

C122µF

C222µF

D17090 XR-E

THERMALPADC6DNP

R249.9K

R512.7K

R30.3

R40.3

R649.9

S2NC

NOD2LM4040D2.048V

R110K

NCL2

VOUT

PGND

FB

GND

4

5

8

7

6

2

1

3

10

9

11

L1

VIN

VINA

SYNC/PS

EN1PwPd

L12.2µH

ThePMP3038circuitwasdesignedforatorchorruggedflashlight.Mosttorchapplicationsstillusealkalinebatterieswithacommonconfigurationoftwoorthreecellsinseriesthathaveamaximumvoltageof5V.Duringoperation,theVBATdropsbelowtheVfoftheLED,andtheTPS63000automaticallyswitchesfrombuckmodetoboostmodetocreatetheconstantcurrentneededforthe




TPS63000 PMP3038

31

Output Current Graphs with DC Coupling

Efficiency Curve for IO = 0.32 A and IO = 0.62 A Turn On with 0.63 A

Control Loop Response Graphs

Output current with VIN = 3 V.

Control loop response with 0.63 A.

Output current with VIN = 4 V.

Control loop response with 0.32 A.

Efficiency.



TPS61500

32

Description TheTPS61500isamonolithicswitchingregulatorwithanintegrated3-A,40-Vpowerswitch.Itisanidealdriverforhigh-brightness1-or3-WLEDs.Thedevicehasawideinput-voltagerangetosupportapplicationswithinputvoltagefrommulticellbatteriesorregulated5-Vto12-Vpowerrails.

TheLEDcurrentissetwithanexternalsenseresistor,R3,andwithfeedbackvoltagethatisregulatedto200mVbyacurrent-modePWMcontrolloop,asshownintheschematicbelow.ThedevicesupportsanalogandpurePWMdimmingmethodsforLEDbrightnesscontrol.ConnectingacapacitortotheDIMCpinconfiguresthedeviceto

currentduringstart-upandhasotherprotectionfeaturesbuiltin,suchaspulse-by-pulseovercurrentlimiting,overvoltageprotectionandthermalshutdown.TheTPS61500isavailableina14-pinHTSSOPpackagewithPowerPAD™.




Input Supply 5 V 12 V

LED number 4 1000 mA 2000 mA



Note: Assumption that LED forward voltage is 3.5V, and TPS61500’s conversion efficiency is 85%.

TPS61500

SW

SW

OVP

FB

PGND

PGND

PGND

VIN

EN

COMP

DIMC

FREQ

S3

AGND

PWM

VIN 5V L1 D1

C1 C2DL13W LED

DL2

DL3

DL4

C4R4

R1

R2

R3

C3

C5

beusedforanalogdimming,andtheLEDcurrentvariesinproportiontothedutycycleofanexternalPWMsignal.FloatingtheDIMCpinconfigurestheICforpurePWMdimming,withtheaverageLEDcurrentbeingthePWMsignal’sdutycycletimesasetLEDcurrent.

Thedevicefeaturesaprogrammablesoft-startfunctiontolimitinrush




TPS61500

33


PWM Dimming Application Circuit: Circuit for the TPS61500 to Perform Analog Dimming Using an Injected Analog Signal

Analog Dimming by External DAC: Pure PWM Dimming Method


Input Supply 5 V 12 V




Note: Assumption that LED forward voltage is 3.5V, and TPS61500’s conversion efficiency is 85%.

TPS61500

SW

SW

OVP

FB

PGND

PGND

PGND

VIN

EN

COMP

DIMC

FREQ

SS

AGND

DSP orµcontroller PWM

0 - 1.229V

VIN 5V L1 D1

C1

DL13W LED

DL2

DL3

DL4C4 C5

≥100nFR4

R1

R2

R3C3

OFF

ON

DAC

TPS61500

SW

SW

OVP

FB

PGND

PGND

PGND

VIN

EN

COMP

DIMC

FREQ

SS

AGND

PWM

VIN 5V L1 D1

C1

C2

DL13W LED

DL2

DL3

DL4C4

R4

R1

R2

R1

R2

R3

Q1

Q2

PWM

C3



TPS40211 PMP4026

34

Description TheTPS40211isawide-input-voltage(4.5-to52-V),nonsynchronousboostcontroller.Itissuitablefortopologiesthatrequireagroundedsourcen-channelFETsuchasboost,flyback,SEPICandvariousLED-driverapplications.TheTPS40211featuresaprogrammablesoftstart,overcurrentprotectionwithautomaticretry,andaprogrammableoscillatorfrequency.Current-modecontrolprovidesimprovedtransientresponseandsimplifiedloopcompensation.Thefeedbackpinhasareferencevoltageof260mVtohelpreducethepowerusageandcostofthesenseresistor.

ThePMP4026circuitshownbelowwasdesignedwithanautomotiveinput-voltagerange.Thedriverwasbuilttooperateunderlow-powertonominal

regulatorforanLEDdriver.Ithasan8-to18-Vinputanda20-to35-Voutput.Itcanbefoundalongwithademonstrationboardat:http://focus.ti.com/docs/toolsw/folders/print/tps40211evm-352.html


PMP4026 Schematic

TPS40211DGS

48V @ 0.7AGND

VDDVBP

GDRVISNSGND

RCSSSDCOMPFB

109876

Freq = 150 KHZ

12345

C71µ

D100(R6)3.3V

VBP

R549.9K

R110.01C9

100pF

R101.21K

Q1Si4858

R215K

C1470pF

R3249K

R1249K

R10010K

C44700pF

C83.3µF

3 2 1

4G

S

D8 7 6 5

1 2

R4A2

D247V

R949.9

C12B3.3µF50V

C12A3.3µF50V

D1MBRS260

1

2

3

Q1002N7002DICT

9 - 18 VINGND

C50.1µ

33 µH

ENAB



Input voltage 9 — 16 VDC



Switching frequency — 150 — kHz

batteryconditionsandtosurviveload-dumpincidents.TheTPS40211waschosenforthisapplicationduetoitslowfeedbackvoltageandwideinput-voltagerange.Theapplication,powereddirectlyfromVBAT,canhaveastringofuptoten700-mALEDsinseriesortwoparallelstringswithuptoten350-mALEDsineachstring.

Anadditionalreferencedesignisavailable.Thisdesignisa700-mA,nonsynchronousboostcurrent




TPS40211 PMP4026

35

Startup

Efficiency Control Loop Frequency Response: 12 V input; 1.15 A Load

Load Regulation of Outputs Load Transients

Output Ripple Current

The input voltage was set at 12 V, with 0.15 (LED) + 1 (resistor) A load on the outputs. The image was taken with a 1.15 A/20 V load. Top waveform is FET drain, bottom is LED current.

Total output current was 1.15 A, output voltage was 20 volts.

Output response to driving TP%. The input voltage was set to 12 V.



TPS40211 PMP3943

36

Description TheTPS40211isawide-input-voltage(4.5-to52-V)nonsynchronousboostcontroller.Itissuitablefortopologiesthatrequireagroundedsourcen-channelFETsuchasboost,flyback,SEPICandvariousLED-driverapplications.TheTPS40211featuresaprogrammablesoftstart;overcurrentprotectionwithautomaticretry;andaprogrammableoscillatorfrequency.Current-modecontrolprovidesimprovedtransientresponseandsimplifiedloopcompensation.Thefeedbackpinhasareferencevoltageof260mVtohelpreducethepowerusageandcostofthesenseresistor.

ThePMP3943circuitshownbelowwasdesignedwithanautomotive

PMP3943 Schematic



Input voltage 8 — 40 Volts

Output voltage — 13 — Volts


Switching frequency — 300 — kHz

U1TPS40211DGS

J1VIN

GND8-40

Short L4L40

13V @ 350mATested with LEDs

Giving 12.3 V

LEDA

LEDC

LEDC

D18180-13C15

3.3µF

VDDVBP

GDRVISNSGND

RCSSSDCOMPFB

109876

Freq = 380 KHZ

3 2 1

4

8 7 6 5

3 4

1 2

12345

03

L2100µH

R101k

R949.9

R549.9

R710

C71µF

R60

R140.75

C1310µF

R110.10

D218V

R10010K

R20

R1249K

C44700pF

C83.3µF

C50.1µF

C1220pF

C347pF

C20.22µF C9

0.1µF

1

2

input-voltagerange.Thedriverwasbuilttooperateunderlow-powerbatteryconditionsandtosurviveload-dumpincidents.TheTPS40211waschosenforthisapplicationduetoitslowfeedbackvoltageandwideinput-voltagerange.

Anadditionalreferencedesignisavailable.Thisdesignisa700-mA,nonsynchronousboostcurrent


regulatorforanLEDdriver.Ithasan8-to18-Vinputanda20-to35-Voutput.Itcanbefoundalongwithademonstrationboardat:http://focus.ti.com/docs/toolsw/folders/print/tps40211evm-352.html




TPS40211 PMP3943

37

3 Green and 1 Red OSRAM LEDs Used as Load for Vf About 12 V

VIN Volts IIN mA VOUT1 Volts IOUT1 mA Efficiency %

40.22 123.6 12.27 341.8 84.4

20.11 238.5 12.27 341.3 87.3

7.93 619.4 12.27 341.3 85.3

Regulation and efficiency: 25 degrres Celsius ambient. Target IOUT was 350mA, hence actual current is 2.5% low.

When Diode Load is Opened, VOUT Goes to About 18 V

VIN Volts IIN mA VOUT1 Volts IOUT1 mA

40.42 8.79 18.44 0

20.08 10.75 18.41 0

8.00 19.12 18.40 0

Short Circuit: Output Current Holds Steady

VIN Volts IIN mA VOUT1 Volts IOUT1 mA

40.14 21.24 0.694 341.6

20.06 34.20 0.694 341.5

8.00 77.70 0.694 341.4

Current Loop Frequency Response


38

Description TheTPS61165operatesovera3-to18-Vinputsupplyanddeliversanoutputvoltageupto38V.Withits40-VratedintegratedswitchFET,thedevicedrivesupto10LEDsinseries.Itoperatesata1.2-MHzfixedswitchingfrequencytoreduceoutputripple,improveconversionefficiency,andallowfortheuseofsmallexternalcomponents.Thedefaultwhite-LED(WLED)currentissetwiththeexternalsensorresistorRSET,andthefeedbackvoltageisregulatedto200mV.IneitherdigitalorPWMdimming,theoutputrippleofTPS61165attheoutputcapacitorissmallanddoesnotgenerateaudiblenoisesassociatedwithcommonon/offcontroldimming.Forprotectionduringopen-LEDconditions,theTPS61165disablesswitchingtopreventtheoutputfromexceedingtheabsolutemaximumratings.

ThePMP3598usestheTPS61165inanonsynchronousboostconfiguration.Anadditionalcircuitbuiltaroundtheopampprovidesthebatteryunder-voltage/chargingindicationsandalsoprovidesORingbetweenthesolarpanelandbatteryinputs.Thecircuitalso

PMP3598 Schematic



Input Voltage 4.5 6 7.4 Volts

Output Voltage 10.45 10.5 10.65 Volts

Output Ripple — — 50 mV pp

Output Current 0 — 350 mA

Switching Frequency — 1200 — kHz

J1 D1BAT54C

D3BAT54C

R11K

D5MBRS120

R181

R161

R6169K

R11226K

R9169K

R34.42K

R42.25M

R210K

R54.42K

U1:BTL103WID

U2

TP

S61

165D

RV

D6BZX84C18T

R1310K

R8Open

D4IN5820

R121K

R2151.1

C22.2µF

C30.22µF

C43.3µF

R1459K

R15100K

R10162K

R176.81K

RT122K

R7100K

C10.1µF

Q1Si2343DS

TP

1

TP

2

TP

5

12

23

65

1 2 3

6 5 4

7

1 2 3 4 5 6 7 8

J41

2

J31

2

L110µH

TP3

TP4 To 28K POT

LED ALED C

R202.61K

4

5

7

FB CO

MP

GN

D

VIN

CT

RL

SW

Pw

Pd

incorporatesthenecessarythermalandovercurrentprotectionsandhasload-disconnectfeature.

KeyconsiderationsforthisdesignarehighefficiencyandgoodLED-currentregulation.TheTPS61165operatesinaconstant-currentmodetoregulatetheLEDcurrent.TheCTRLpinisusedforthecontrolinputforbothdigitalandPWMdimming.ThedimmingmodefortheTPS61165isselectedeachtimethedeviceisenabled.Analogdimminghasbeenimplementedbyvaryingthefeedbackreference.A20-kΩvariableresistorcanbeusedtovarytheLEDcurrenttoachievedimming.Theconverterboosts6to10.5Vat350mAandhasminimumconversionefficiencyof85%.Thiscircuitis

usedfordrivingthree1-WLEDsormultiple50-mALEDswhostotalpowerinputdoesnotexceed3W.


Datasheets, user’s guides, samples:www.ti.com/sc/device/TPS61165

3-Watt Solar Lantern

TPS61165 PMP3598


3-Watt Solar Lantern

TPS61165 PMP3598

39

Switching Waveform

Open LED Protection

Efficiency

Output Ripple

PRSRTSTDU.S.POSTAGE

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B093008

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