TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 FEATURES D (SOIC) OR P (PDIP) PACKAGE • LowStart-UpCurrent(<0.5mA) (TOP VIEW) • TrimmedOscillatorDischargeCurrent • CurrentModeOperationto500kHz COMP 1 8 VREF • AutomaticFeed-ForwardCompensation VFB 2 7 VCC ISENSE 3 6 OUTPUT • LatchingPWMforCycle-by-CycleCurrent RT/CT 4 5 GND Limiting • InternallyTrimmedReferenceWith D (SOIC) PACKAGE UndervoltageLockout (TOP VIEW) • High-CurrentTotem-PoleOutputUndervoltage LockoutWithHysteresis COMP 1 14 VREF • Double-PulseSuppression NC 2 13 NC VFB 3 12 VCC NC 4 11 VC I 5 10 OUTPUT SENSE NC 6 9 GND R /C 7 8 POWER GROUND T T NC − No internal connection DESCRIPTION/ORDERING INFORMATION The TL284xB and TL384xB series of control integrated circuits provide the features that are necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of external components. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channelMOSFETs,islowwhenitisintheoffstate. The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturationvoltageof1.2Vwhilesinking10mA(V =5V). CC Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for operationfrom–40(cid:176) Cto85(cid:176) C.TheTL384xB-seriesdevicesarecharacterizedforoperationfrom0(cid:176) Cto70(cid:176) C. Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet. PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2006–2007,TexasInstrumentsIncorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarilyincludetestingofallparameters.

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 ORDERINGINFORMATION T PACKAGE(1) ORDERABLEPARTNUMBER TOP-SIDEMARKING A TL2842BP TL2842BP TL2843BP TL2843BP PDIP–P Tubeof50 TL2844BP TL2844BP TL2845BP TL2845BP Tubeof75 TL2842BD-8 2842B Reelof2500 TL2842BDR-8 Tubeof75 TL2843BD-8 2843B Reelof2500 TL2843BDR-8 SOIC–D(8pin) Tubeof75 TL2844BD-8 2844B Reelof2500 TL2844BDR-8 –40(cid:176) Cto85(cid:176) C Tubeof75 TL2845BD-8 2845B Reelof2500 TL2845BDR-8 Tubeof75 TL2842BD TL2842B Reelof2500 TL2842BDR Tubeof75 TL2843BD TL2843B Reelof2500 TL2843BDR SOIC–D(14pin) Tubeof75 TL2844BD TL2844B Reelof2500 TL2844BDR Tubeof75 TL2845BD TL2845B Reelof2500 TL2845BDR TL3842BP TL3842BP TL3843BP TL3843BP PDIP–P Tubeof50 TL3844BP TL3844BP TL3845BP TL3845BP Tubeof75 TL3842BD-8 3842B Reelof2500 TL3842BDR-8 Tubeof75 TL3843BD-8 3843B Reelof2500 TL3843BDR-8 SOIC–D(8pin) Tubeof75 TL3844BD-8 3844B Reelof2500 TL3844BDR-8 0(cid:176) Cto70(cid:176) C Tubeof75 TL3845BD-8 3845B Reelof2500 TL3845BDR-8 Tubeof75 TL3842BD TL3842B Reelof2500 TL3842BDR Tubeof75 TL3843BD TL3843B Reelof2500 TL3843BDR SOIC–D(14pin) Tubeof75 TL3844BD TL3844B Reelof2500 TL3844BDR Tubeof75 TL3845BD TL3845B Reelof2500 TL3845BDR (1) Packagedrawings,standardpackingquantities,thermaldata,symbolization,andPCBdesignguidelinesareavailableat www.ti.com/sc/package. 2 SubmitDocumentationFeedback

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 FUNCTIONALBLOCKDIAGRAM 7 VCC 34 V NOM UVLO 5-V VREF 8 GND 5 − + EN VREF Internal Bias 2.5 V VREF Good Logic RT/CT 4 OSC 6 OUTPUT T Error Amplifier S + 2R 2 PWM VFB − R Latch R 1 V COMP 1 Current- Sense 3 Comparator ISENSE A. Pinnumbersshownareforthe8-pinDpackage. SubmitDocumentationFeedback 3

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 Absolute Maximum Ratings(1)(2) overoperatingfree-airtemperaturerange(unlessotherwisenoted) MIN MAX UNIT Lowimpedancesource 30 VCC Supplyvoltage Self V I <30mA CC limiting V Analoginputvoltagerange VFBandI –0.3 6.3 V I SENSE I Supplycurrent 30 mA CC I Outputcurrent – 1 A O I Erroramplifieroutputsinkcurrent 10 mA O(sink) 8pin 97 Dpackage θ Packagethermalimpedance(3)(4) 14pin 86 (cid:176) C/W JA Ppackage 85 Outputenergy Capacitiveload 5 μJ T Virtualjunctiontemperature 150 (cid:176) C J T Storagetemperaturerange –65 150 (cid:176) C stg T Leadtemperature Soldering,10s 300 (cid:176) C lead (1) Stressesbeyondthoselistedunder"absolutemaximumratings"maycausepermanentdamagetothedevice.Thesearestressratings only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder"recommendedoperating conditions"isnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability. (2) AllvoltagesarewithrespecttothedeviceGNDterminal. (3) MaximumpowerdissipationisafunctionofT(max),θ ,andT .Themaximumallowablepowerdissipationatanyallowableambient J JA A temperatureisP =(T(max)–T )/θ .OperatingattheabsolutemaximumT of150(cid:176) Ccanimpactreliability. D J A JA J (4) ThepackagethermalimpedanceiscalculatedinaccordancewithJESD51-7. Recommended Operating Conditions MIN NOM MAX UNIT V 30 CC V Supplyvoltage V CC VC(1) 30 R /C 0 5.5 T T V Inputvoltage V I VFBandI 0 5.5 SENSE OUTPUT 0 30 V Outputvoltage V O POWERGROUND(1) –0.1 1 I Supplycurrent,externallylimited 25 mA CC I Averageoutputcurrent 200 mA O I Referenceoutputcurrent –20 mA O(ref) f Oscillatorfrequency 100 500 kHz osc TL284xB –40 85 T Operatingfree-airtemperature (cid:176) C J TL384xB 0 70 (1) TherecommendedvoltagesforVCandPOWERGROUNDapplyonlytothe14-pinDpackage. 4 SubmitDocumentationFeedback

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 Reference Section Electrical Characteristics V =15V(1),R =10kW ,C =3.3nF,overrecommendedoperatingfree-airtemperaturerange(unlessotherwisespecified) CC T T TL284xB TL384xB PARAMETER TESTCONDITIONS UNIT MIN TYP(2) MAX MIN TYP(2) MAX Outputvoltage I =1mA,T =25(cid:176) C 4.95 5 5.05 4.9 5 5.1 V O J Lineregulation V =12Vto25V 6 20 6 20 mV CC Loadregulation I =1mAto20mA 6 25 6 25 mV O Averagetemperature 0.2 0.4 0.2 0.4 mV/(cid:176) C coefficientofoutputvoltage Outputvoltage,worst-case V =12Vto25V, CC 4.9 5.1 4.82 5.18 V variation I =1mAto20mA O Outputnoisevoltage f=10Hzto10kHz,T =25(cid:176) C 50 50 μV J Output-voltagelong-termdrift After1000hatT =25(cid:176) C 5 25 5 25 mV J Short-circuitoutputcurrent –30 –100 –180 –30 –100 –180 mA (1) AdjustV abovethestartthresholdbeforesettingitto15V. CC (2) AlltypicalvaluesareatT =25(cid:176) C. J Oscillator Section(1) Electrical Characteristics V =15V(2),R =10kW ,C =3.3nF,overrecommendedoperatingfree-airtemperaturerange(unlessotherwisespecified) CC T T TL284xB TL384xB PARAMETER TESTCONDITIONS UNIT MIN TYP(3) MAX MIN TYP(3) MAX T =25(cid:176) C 49 52 55 49 52 55 J T =T toT 48 56 48 56 Initialaccuracy A low high kHz T =25(cid:176) C,R =6.2kW , J T 225 250 275 225 250 275 C =1nF T Voltagestability V =12Vto25V 0.2 1 0.2 1 % CC Temperaturestability 5 5 % Amplitude Peaktopeak 1.7 1.7 V T =25(cid:176) C,R /C =2V 7.8 8.3 8.8 7.8 8.3 8.8 J T T Dischargecurrent mA R /C =2V 7.5 8.8 7.6 8.8 T T (1) OutputfrequencyequalsoscillatorfrequencyfortheTL3842BandTL3843B.Outputfrequencyisone-halftheoscillatorfrequencyforthe TL3844BandTL3845B. (2) AdjustV abovethestartthresholdbeforesettingitto15V. CC (3) AlltypicalvaluesareatT =25(cid:176) C. J SubmitDocumentationFeedback 5

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 Error-Amplifier Section Electrical Characteristics V =15V(1),R =10kW ,C =3.3nF,overrecommendedoperatingfree-airtemperaturerange(unlessotherwisespecified) CC T T TL284xB TL384xB PARAMETER TESTCONDITIONS UNIT MIN TYP(2) MAX MIN TYP(2) MAX Feedbackinputvoltage COMP=2.5V 2.45 2.5 2.55 2.42 2.5 2.58 V Inputbiascurrent –0.3 –1 –0.3 –2 μA Open-loopvoltage V =2Vto4V 65 90 65 90 dB amplification O Gain-bandwidthproduct 0.7 1 0.7 1 MHz Supply-voltagerejectionratio V =12Vto25V 60 70 60 70 dB CC Outputsinkcurrent VFB=2.7V,COMP=1.1V 2 6 2 6 mA Outputsourcecurrent VFB=2.3V,COMP=5V –0.5 –0.8 –0.5 –0.8 mA VFB=2.3V, High-leveloutputvoltage R =15kW toGND 5 6 5 6 V L VFB=2.7V, Low-leveloutputvoltage R =15kW toGND 0.7 1.1 0.7 1.1 V L (1) AdjustV abovethestartthresholdbeforesettingitto15V. CC (2) AlltypicalvaluesareatT =25(cid:176) C. J Current-Sense Section Electrical Characteristics V =15V(1),R =10kW ,C =3.3nF,overrecommendedoperatingfree-airtemperaturerange(unlessotherwisespecified) CC T T TL284xB TL384xB PARAMETER TESTCONDITIONS UNIT MIN TYP(2) MAX MIN TYP(2) MAX Voltageamplification(3)(4) 2.85 3 3.15 2.85 3 3.15 V/V Current-sensecomparator threshold(3) COMP=5V 0.9 1 1.1 0.9 1 1.1 V Supply-voltagerejection ratio(3) VCC=12Vto25V 70 70 dB Inputbiascurrent –2 –10 –2 –10 μA Delaytimetooutput VFB=0Vto2V 150 300 150 300 ns (1) AdjustV abovethestartthresholdbeforesettingitto15V. CC (2) AlltypicalvaluesareatT =25(cid:176) C. J (3) Measuredatthetrippointofthelatch,withVFBat0V. (4) MeasuredbetweenI andCOMP,withtheinputchangingfrom0Vto0.8V. SENSE 6 SubmitDocumentationFeedback

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 Output Section Electrical Characteristics V =15V(1),R =10kW ,C =3.3nF,overrecommendedoperatingfree-airtemperaturerange(unlessotherwisespecified) CC T T TL284xB TL384xB PARAMETER TESTCONDITIONS UNIT MIN TYP(2) MAX MIN TYP(2) MAX I =–20mA 13 13.5 13 13.5 OH High-leveloutputvoltage V I =–200mA 12 13.5 12 13.5 OH I =20mA 0.1 0.4 0.1 0.4 OL Low-leveloutputvoltage V I =200mA 1.5 2.2 1.5 2.2 OL Risetime C =1nF,T =25(cid:176) C 50 150 50 150 ns L J Falltime C =1nF,T =25(cid:176) C 50 150 50 150 ns L J UVLOsaturation V =5V,I =1mA 0.7 1.2 0.7 1.2 V CC OL (1) AdjustV abovethestartthresholdbeforesettingitto15V. CC (2) AlltypicalvaluesareatT =25(cid:176) C. J Undervoltage-Lockout Section Electrical Characteristics V =15V(1),R =10kW ,C =3.3nF,overrecommendedoperatingfree-airtemperaturerange(unlessotherwisespecified) CC T T TL284xB TL384xB PARAMETER TESTCONDITIONS UNIT MIN TYP(2) MAX MIN TYP(2) MAX TLx842B,TLx844B 15 16 17 14.5 16 17.5 Startthresholdvoltage V TLx843B,TLx845B 7.8 8.4 9 7.8 8.4 9 Minimumoperatingvoltage TLx842B,TLx844B 9 10 11 8.5 10 11.5 V afterstart-up TLx843B,TLx845B 7 7.6 8.2 7 7.6 8.2 (1) AdjustV abovethestartthresholdbeforesettingitto15V. CC (2) AlltypicalvaluesareatT =25(cid:176) C. J Pulse-Width Modulator Section Electrical Characteristics V =15V(1),R =10kW ,C =3.3nF,overrecommendedoperatingfree-airtemperaturerange(unlessotherwisespecified) CC T T TL284xB TL384xB PARAMETER TESTCONDITIONS UNIT MIN TYP(2) MAX MIN TYP(2) MAX TL3842B,TL3843B 94 96 100 94 96 100 Maximumdutycycle % TL3844B,TL3845B 47 48 50 47 48 50 Minimumdutycycle 0 0 % (1) AdjustV abovethestartthresholdbeforesettingitto15V. CC (2) AlltypicalvaluesareatT =25(cid:176) C. J Supply Voltage Electrical Characteristics V =15V(1),R =10kW ,C =3.3nF,overrecommendedoperatingfree-airtemperaturerange(unlessotherwisespecified) CC T T TL284xB TL384xB PARAMETER TESTCONDITIONS UNIT MIN TYP(2) MAX MIN TYP(2) MAX Start-upcurrent 0.3 0.5 0.3 0.5 mA Operatingsupplycurrent VFBandI at0V 11 17 11 17 mA SENSE Limitingvoltage I =25mA 30 34 30 34 V CC (1) AdjustV abovethestartthresholdbeforesettingitto15V. CC (2) AlltypicalvaluesareatT =25(cid:176) C. J SubmitDocumentationFeedback 7

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 TYPICAL CHARACTERISTICS ERRORAMPLIFIEROPEN-LOOP SUPPLYCURRENT GAINANDPHASE vs vs SUPPLYVOLTAGE FREQUENCY 25 100 200 B d 80 150 20 – n nt–mA 15 ageGai 60 Phase 100 –deg urre Volt 40 50 gin C p ar y o M ppl 10 Lo se I–SuCC 5 2845 2842 –Open-VOL 200 VRCLC==11050VkkXΩ Gain -050 Pha TL TL A TA=25°C -20 -100 0 1.1E+001 11.E0+002 11.Ek+03 11.E0+0k4 11.0E+00k5 1.1EM+06 11.E0+M07 0 5 10 15 20 25 30 35 40 f–Frequency–Hz V –SupplyVoltage–V CC CURRENT-SENSEINPUTTHRESHOLD OSCILLATORDISCHARGECURRENT vs vs ERRORAMPLIFIEROUTPUTVOLTAGE TEMPERATURE 1.2 9.2 V VIN=15V mA 9 VVIN==152VV – 1 – OSC shold rrent 8.8 re 0.8 Cu 8.6 h utT TA=125°C arge 8.4 p h n 0.6 c I s nse TA=25°C rDi 8.2 e o urrent-S 0.4 TA=-55°C Oscillat 7.88 C 0.2 – V–th Idisharge 7.6 0 7.4 0 1 2 3 4 5 6 7 8 -55 -35 -15 5 25 45 65 85 105 125 145 V –ErrorAmplifierOutputVoltage–V T –Temperature–°C O A 8 SubmitDocumentationFeedback

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 TYPICAL CHARACTERISTICS (continued) REFERENCEVOLTAGE REFERENCEVOLTAGE vs vs SOURCECURRENT TEMPERATURE 0 5.2 5.15 -10 V m V 5.1 – – a -20 e elt ag 5.05 VoltageD -30 TA=125°C TA=-40°C enceVolt 5 nce -40 Refer 4.95 e er T =25°C – Ref -50 A Vref 4.9 4.85 -60 4.8 0 20 40 60 80 100 120 140 160 -55 -30 -5 20 45 70 95 120 145 I –SourceCurrent–mA src T –Temperature–°C A REFERENCESHORT-CIRCUITCURRENT OUTPUTSATURATIONVOLTAGE vs vs TEMPERATURE LOADCURRENT 180 10 0 V =15V SourceSaturation IN 9 TA=25°C -1 160 A 8 -2 m V TA=-55°C – 140 – 7 -3 urrent 120 oltage 6 -4 C V uit on 5 -5 Circ 100 rati 4 -6 rt- atu SinkSaturation Sho 80 nkS 3 TA=-55°C -7 –C Si 2 -8 S I 60 1 TA=25°C -9 40 0 -10 -55 -30 -5 20 45 70 95 120 145 0 100 200 300 400 500 600 700 800 T –Temperature–°C I –OutputLoadCurrent–mA A O SubmitDocumentationFeedback 9

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 TYPICAL CHARACTERISTICS (continued) MAXIMUMOUTPUTDUTYCYCLE vs TIMINGRESISTOR 100 V =15V CC 90 CT=3.3nF % T =25°C A – e cl 80 y C y ut D 70 m u m xi a 60 M – max D 50 40 0.1 1 10 R –TimingResistor–kkΩ€ T OUTPUTWAVEFORM 10 SubmitDocumentationFeedback

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 APPLICATION INFORMATION Theerror-amplifierconfiguationcircuitisshowninFigure1. 2.5 V 0.5 mA Error Amplifier VFB + Zi − COMP Zf A. Erroramplifiercansourceorsinkupto0.5mA. Figure1.Error-AmplifierConfiguration Thecurrent-sensecircuitisshowninFigure2. Error IS Amplifier (see Note A) 2R + − R 1 V Current-Sense COMP Comparator Rf ISENSE RS Cf GND A. Peakcurrent(I )isdeterminedbytheformula:I =1V/R S S(max) S B. AsmallRCfilterformedbyresistorR andcapacitorC mayberequiredtosuppressswitchtransients. f f Figure2.Current-SenseCircuit TheoscillatorfrequencyissetusingthecircuitshowninFigure3.Thefrequencyiscalculatedas: f=1/R C T T ForR >5kW : T f» 1.72/R C T T VREF RT RT/CT CT GND Figure3.OscillatorSection SubmitDocumentationFeedback 11

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 APPLICATION INFORMATION (continued) DEAD TIME TIMING RESISTANCE vs vs TIMING CAPACITANCE FREQUENCY 100 100 VCC = 15 V CT = 10 nF 40 RTAT =≥ 255 k°WC CT = 4.7 nF 40 CT = 2.2 nF s 10 We − k CT = 1 nF c m− n Time 4 esista 10 CT = 22 nF d R Dea ming CT = 47 nF 1 Ti − T 4 CT = 100 nF R 0.4 VCC = 15 V TA = 25°C 0.1 1 1 4 10 40 100 100 1k 10k 100k 1M CT − Timing Capacitance − nF f − Frequency − Hz Open-Loop Laboratory Test Fixture In the open-loop laboratory test fixture (see Figure 4), high peak currents associated with loads necessitate carefulgroundingtechniques.Timingandbypasscapacitorsshouldbeconnectedclosetothe GND terminal in a single-point ground. The transistor and 5-kW potentiometer sample the oscillator waveform and apply an adjustableramptotheI terminal. SENSE REF RT 4.7 kW A VCC 2N2222 100 kW COMP VREF 0.1 m F 1-kW VFB TTLL238844xxBB VCC Error Amplifier Adjust 5 kW ISENSE OUTPUT 0.1 m F 1 kW , 1 W OUTPUT 4.7 kW AISdEjNuSsEt RT/CT GND GND CT Figure4.Open-LoopLaboratoryTestFixture 12 SubmitDocumentationFeedback

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B–AUGUST2006–REVISEDJULY2007 APPLICATION INFORMATION (continued) Shutdown Technique The PWM controller (see Figure 5) can be shut down by two methods: either raise the voltage at I above SENSE 1 V or pull the COMP terminal below a voltage two diode drops above ground. Either method causes the output of the PWM comparator to be high (refer to block diagram). The PWM latch is reset dominant so that the output remains low until the next clock cycle after the shutdown condition at the COMP or I terminal is removed. SENSE In one example, an externally latched shutdown can be accomplished by adding an SCR that resets by cycling V belowthelowerUVLOthreshold.Atthispoint,thereferenceturnsoff,allowingtheSCRtoreset. CC 1 kW VREF COMP Shutdown 330 W ISENSE Shutdown 500 W To Current-Sense Resistor Figure5.ShutdownTechniques A fraction of the oscillator ramp can be summed resistively with the current-sense signal to provide slope compensation for converters requiring duty cycles over 50% (see Figure 6). Note that capacitor C forms a filter withR2tosuppresstheleading-edgeswitchspikes. VREF 0.1 m F RT RT/CT CT R1 ISENSE R2 ISENSE C RSENSE Figure6.SlopeCompensation SubmitDocumentationFeedback 13

PACKAGE OPTION ADDENDUM www.ti.com 14-Sep-2018 PACKAGING INFORMATION Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) TL2842BD ACTIVE SOIC D 14 50 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 TL2842B & no Sb/Br) TL2842BD-8 ACTIVE SOIC D 8 75 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2842B & no Sb/Br) TL2842BDR ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 TL2842B & no Sb/Br) TL2842BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2842B & no Sb/Br) TL2842BP ACTIVE PDIP P 8 50 Green (RoHS CU NIPDAU N / A for Pkg Type -40 to 85 TL2842BP & no Sb/Br) TL2843BD ACTIVE SOIC D 14 50 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 TL2843B & no Sb/Br) TL2843BD-8 ACTIVE SOIC D 8 75 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2843B & no Sb/Br) TL2843BDR ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 TL2843B & no Sb/Br) TL2843BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2843B & no Sb/Br) TL2843BDRG4-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2843B & no Sb/Br) TL2843BP ACTIVE PDIP P 8 50 Green (RoHS CU NIPDAU N / A for Pkg Type -40 to 85 TL2843BP & no Sb/Br) TL2844BD-8 ACTIVE SOIC D 8 75 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2844B & no Sb/Br) TL2844BDR ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 TL2844B & no Sb/Br) TL2844BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2844B & no Sb/Br) TL2844BDRG4-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2844B & no Sb/Br) TL2845BD ACTIVE SOIC D 14 50 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 TL2845B & no Sb/Br) TL2845BD-8 ACTIVE SOIC D 8 75 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2845B & no Sb/Br) Addendum-Page 1

PACKAGE OPTION ADDENDUM www.ti.com 14-Sep-2018 Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) TL2845BDR ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 TL2845B & no Sb/Br) TL2845BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2845B & no Sb/Br) TL2845BDRG4-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM -40 to 85 2845B & no Sb/Br) TL3842BD ACTIVE SOIC D 14 50 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 TL3842B & no Sb/Br) TL3842BD-8 ACTIVE SOIC D 8 75 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 3842B & no Sb/Br) TL3842BDR ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 TL3842B & no Sb/Br) TL3842BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 3842B & no Sb/Br) TL3842BP ACTIVE PDIP P 8 50 Green (RoHS CU NIPDAU N / A for Pkg Type 0 to 70 TL3842BP & no Sb/Br) TL3843BD ACTIVE SOIC D 14 50 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 TL3843B & no Sb/Br) TL3843BD-8 ACTIVE SOIC D 8 75 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 3843B & no Sb/Br) TL3843BDR ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 TL3843B & no Sb/Br) TL3843BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 3843B & no Sb/Br) TL3843BDRG4 ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 TL3843B & no Sb/Br) TL3843BP ACTIVE PDIP P 8 50 Green (RoHS CU NIPDAU N / A for Pkg Type 0 to 70 TL3843BP & no Sb/Br) TL3844BD-8 ACTIVE SOIC D 8 75 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 3844B & no Sb/Br) TL3844BDR ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 TL3844B & no Sb/Br) TL3844BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 3844B & no Sb/Br) TL3844BP ACTIVE PDIP P 8 50 Green (RoHS CU NIPDAU N / A for Pkg Type 0 to 70 TL3844BP & no Sb/Br) Addendum-Page 2

PACKAGE OPTION ADDENDUM www.ti.com 14-Sep-2018 Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) TL3845BD ACTIVE SOIC D 14 50 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 TL3845B & no Sb/Br) TL3845BD-8 ACTIVE SOIC D 8 75 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 3845B & no Sb/Br) TL3845BDR ACTIVE SOIC D 14 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 TL3845B & no Sb/Br) TL3845BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS CU NIPDAU Level-1-260C-UNLIM 0 to 70 3845B & no Sb/Br) TL3845BP ACTIVE PDIP P 8 50 Green (RoHS CU NIPDAU N / A for Pkg Type 0 to 70 TL3845BP & no Sb/Br) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and Addendum-Page 3

PACKAGE OPTION ADDENDUM www.ti.com 14-Sep-2018 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. OTHER QUALIFIED VERSIONS OF TL2843B : •Automotive: TL2843B-Q1 NOTE: Qualified Version Definitions: •Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects Addendum-Page 4

PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *Alldimensionsarenominal Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1 Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant (mm) W1(mm) TL2842BDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 TL2842BDR-8 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TL2843BDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 TL2843BDR-8 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TL2844BDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 TL2844BDR-8 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TL2845BDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 TL2845BDR-8 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TL3842BDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 TL3842BDR-8 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TL3843BDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 TL3843BDR-8 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TL3844BDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 TL3844BDR-8 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TL3845BDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 TL3845BDR-8 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 PackMaterials-Page1

PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *Alldimensionsarenominal Device PackageType PackageDrawing Pins SPQ Length(mm) Width(mm) Height(mm) TL2842BDR SOIC D 14 2500 367.0 367.0 38.0 TL2842BDR-8 SOIC D 8 2500 340.5 338.1 20.6 TL2843BDR SOIC D 14 2500 367.0 367.0 38.0 TL2843BDR-8 SOIC D 8 2500 340.5 338.1 20.6 TL2844BDR SOIC D 14 2500 367.0 367.0 38.0 TL2844BDR-8 SOIC D 8 2500 340.5 338.1 20.6 TL2845BDR SOIC D 14 2500 367.0 367.0 38.0 TL2845BDR-8 SOIC D 8 2500 340.5 338.1 20.6 TL3842BDR SOIC D 14 2500 367.0 367.0 38.0 TL3842BDR-8 SOIC D 8 2500 340.5 338.1 20.6 TL3843BDR SOIC D 14 2500 367.0 367.0 38.0 TL3843BDR-8 SOIC D 8 2500 340.5 338.1 20.6 TL3844BDR SOIC D 14 2500 367.0 367.0 38.0 TL3844BDR-8 SOIC D 8 2500 340.5 338.1 20.6 TL3845BDR SOIC D 14 2500 367.0 367.0 38.0 TL3845BDR-8 SOIC D 8 2500 340.5 338.1 20.6 PackMaterials-Page2

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PACKAGE OUTLINE D0008A SOIC - 1.75 mm max height SCALE 2.800 SMALL OUTLINE INTEGRATED CIRCUIT C SEATING PLANE .228-.244 TYP [5.80-6.19] .004 [0.1] C A PIN 1 ID AREA 6X .050 [1.27] 8 1 2X .189-.197 [4.81-5.00] .150 NOTE 3 [3.81] 4X (0 -15 ) 4 5 8X .012-.020 B .150-.157 [0.31-0.51] .069 MAX [3.81-3.98] .010 [0.25] C A B [1.75] NOTE 4 .005-.010 TYP [0.13-0.25] 4X (0 -15 ) SEE DETAIL A .010 [0.25] .004-.010 0 - 8 [0.11-0.25] .016-.050 [0.41-1.27] DETAIL A (.041) TYPICAL [1.04] 4214825/C 02/2019 NOTES: 1. Linear dimensions are in inches [millimeters]. Dimensions in parenthesis are for reference only. Controlling dimensions are in inches. Dimensioning and tolerancing per ASME Y14.5M. 2. This drawing is subject to change without notice. 3. This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not exceed .006 [0.15] per side. 4. This dimension does not include interlead flash. 5. Reference JEDEC registration MS-012, variation AA. www.ti.com

EXAMPLE BOARD LAYOUT D0008A SOIC - 1.75 mm max height SMALL OUTLINE INTEGRATED CIRCUIT 8X (.061 ) [1.55] SYMM SEE DETAILS 1 8 8X (.024) [0.6] SYMM (R.002 ) TYP [0.05] 5 4 6X (.050 ) [1.27] (.213) [5.4] LAND PATTERN EXAMPLE EXPOSED METAL SHOWN SCALE:8X SOLDER MASK SOLDER MASK METAL OPENING OPENING METAL UNDER SOLDER MASK EXPOSED METAL EXPOSED METAL .0028 MAX .0028 MIN [0.07] [0.07] ALL AROUND ALL AROUND NON SOLDER MASK SOLDER MASK DEFINED DEFINED SOLDER MASK DETAILS 4214825/C 02/2019 NOTES: (continued) 6. Publication IPC-7351 may have alternate designs. 7. Solder mask tolerances between and around signal pads can vary based on board fabrication site. www.ti.com

EXAMPLE STENCIL DESIGN D0008A SOIC - 1.75 mm max height SMALL OUTLINE INTEGRATED CIRCUIT 8X (.061 ) [1.55] SYMM 1 8 8X (.024) [0.6] SYMM (R.002 ) TYP [0.05] 5 4 6X (.050 ) [1.27] (.213) [5.4] SOLDER PASTE EXAMPLE BASED ON .005 INCH [0.125 MM] THICK STENCIL SCALE:8X 4214825/C 02/2019 NOTES: (continued) 8. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations. 9. Board assembly site may have different recommendations for stencil design. www.ti.com

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