UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 DUAL CHANNEL SYNCHRONIZED CURRENT-MODE PWM FEATURES DESCRIPTION • SingleOscillatorSynchronizesTwoPWMs The UCC3810 is a high-speed BiCMOS controller • 150-µAStartupSupplyCurrent integrating two synchronized pulse width modulators • 2-mAOperatingSupplyCurrent for use in off-line and dc-to-dc power supplies. The UCC3810 family provides perfect synchronization • Operationto1MHz between two PWMs by usin g the same oscillator. • InternalSoft-Start The oscillator’s sawtooth waveform can be used for • Full-CycleFaultRestart slopecompensationifrequired. • InternalLeading-EdgeBlankingoftheCurrent Using a toggle flip-flop to alternate between SenseSignal modulators, the UCC3810 ensures that one PWM does not slave, interfere, or otherwise affect the • 1-ATotemPoleOutputs other PWM. This toggle flip- flop also ensures that • 75-nsTypicalResponsefromCurrentSense each PWM is limited to 50% maximum duty cycle, toOutput insuring adequate off-time to reset magnetic • 1.5%ToleranceVoltageReference elements. This device contains many of the same elements of the UC3842 current mode controller N PACKAGE family, combined with the enhancements of the (TOP VIEW) UCC3802. This minimizes power supply parts count. Enhancements include leading edge blanking of the SYNC 1 16 VCC current sense signals, full cycle fault restart, CMOS CT 2 15 REF output drivers, and outputs which remain low even RT 3 14 ENABLE2 whenthesupplyvoltageisremoved. FB1 4 13 FB2 COMP1 5 12 COMP2 CS1 6 11 CS2 OUT1 7 10 OUT2 GND 8 9 PWRGND PW PACKAGE (TOP VIEW) SYNC 1 16 VCC CT 2 15 REF RT 3 14 ENABLE2 FB1 4 13 FB2 COMP1 5 12 COMP2 CS1 6 11 CS2 OUT1 7 10 OUT2 GND 8 9 PWRGND Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet. PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©1999–2007,TexasInstrumentsIncorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarilyincludetestingofallparameters.

UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates. ORDERINGINFORMATION PACKAGEDDEVICES(1) T J SOP(DW) PDIP(N) –40°Cto85°C UCC2810DW(16) UCC2810N(16) 0°Cto70°C UCC3810DW(16) UCC3810N(16) (1) Allpackagesareavailabletapedandreeled(indicatedbytheRsuffixonthedevicetypee.g., UCC2810JR) ABSOLUTE MAXIMUM RATINGS overoperatingfree-airtemperaturerange(unlessotherwisenoted)(1)(2) UNIT V Supplyvoltage(3) 11V CC I Supplycurrent 20mA CC Outputpeakcurrent,OUT1,OUT2,5%dutycycle ±1A Outputenergy,OUT1,OUT2,capacitiveload20µJ 20µJ Analoginputs,FB1,FB2,CS1,CS2,SYNC –0.3to6.3V T Operatingjunctiontemperature 150°C J T Storagetemperaturerange –65to150°C stg Leadtemperature(soldering,10sec) 300°C (1) Currentsarepositiveinto,negativeoutofthespecifiedterminal.AllvoltagesarewithrespecttoGND. (2) Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratings only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperating conditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability. (3) Innormaloperation,V ispoweredthroughacurrent-limitingresistor.Absolutemaximumof11Vapplieswhendrivenfromalow CC impedancesuchthattheV currentdoesnotexceed20mA. CC BLOCKDIAGRAM REF FB1 COMP1 CS1 CS2 VCC 15 15 5 6 11 16 Over-Current Comparator Leading Leading 12.5 V Edge Edge 1.5 V Blanking Blanking VCC OK VCC 2.5E Vrror S Q 7 OUT1 Amp 1 55 k(cid:1) Voltage R Ref REF OK S Q 100 k(cid:1) 1 V R Error 4 V Amp 2 S Q 10 OUT2 0.5 V R 2.5 V + S Q Full Cycle − R Soft Start R 35 (cid:2)A 55 k(cid:1) 2 t − 5ms 100 k(cid:1) 1 V Oscillator 13 12 1 2 3 14 9 8 FB2 COMP2 SYNC CT RT ENABLES PWRGND GND VDG−92062−1 2 SubmitDocumentationFeedback

UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 ELECTRICAL CHARACTERISTICS Allparametersarethesameforbothchannels,–40°C£ T £ 85°CfortheUCC2810,0°C£ T £ 70°CfortheUCC3810, A A V =10V(1);R =150kW ,C =120pF;noload;T =T (unlessotherwisespecified) CC T T A J; PARAMETER TESTCONDITIONS MIN TYP MAX UNIT REFERENCE T =25°C 4.925 5.000 5.075 J V Outputvoltage V CC T =fullrange,0mA£ I £ 5mA 4.85 5.00 5.10 J REF Loadregulation 0mA£ I £ 5mA 5 30 REF UVLOstopthresholdvoltage, 12 mV Lineregulation 0.5V£ V £ V CC SHUNT Outputnoisevoltage(2) 10Hz<f<10kHz, T =25°C 235 µV J Longtermstability(2) TA=125°C, 1000hours 5 mV I Outputshortcircuitcurrent -8 -25 mA O(SC) OSCILLATOR R =30kW , C =120pF 860 980 1100 f Oscillatorfrequency(3) T T kHz OSC R =150kW , C =120pF 190 220 250 T T Temperaturestability(2) 2.5% Peakvoltage 2.5 Valleyvoltage 0.05 V Peak-to-peakamplitude 2.25 2.45 2.65 SYNCthresholdvoltage 0.80 1.65 2.20 SYNCinputcurrent SYNC=5V 30 µA ERRORAMPLIFIER V FBinputvoltage COMP=2.5V 2.44 2.50 2.56 V FB I FBinputbiascurrent ±1 µA FB Openloopvoltagegain 60 73 dB f Unitygainbandwidth(2) 2 MHz GAIN I Sinkcurrent,COMP FB=2.7V, COMP=1V 0.3 1.4 3.5 SINK I Sourcecurrent,COMP FB=1.8V, COMP=4V -0.2 -0.5 -0.8 mA SRCE Minimumdutycycle COMP=0V 0% FB=1.8V, 5 Soft-startrisetime,COMP ms Risefrom0.5Vto(REF–1.5V) CURRENTSENSE Gain(4) 1.20 1.55 1.80 V/V Maximuminputsignal(5) COMP=5V 0.9 1.0 1.1 V I Inputbiascurrent,CS ±200 nA CS CSstepsfrom0Vto1.2V, 75 Propagationdelaytime(CStoOUT) COMP=2.5V ns Blanktime,CS(6) 55 Overcurrentthresholdvoltage,CS 1.35 1.55 1.85 V COMP-to-CSoffsetvoltage CS=0V 0.45 0.90 1.35 (1) ForUCC3810,adjustV abovethestartthresholdbeforesettingat10V. CC (2) Ensuredbydesign.Notproductiontested. 4 f = OSC R ´C (3) Oscillatorfrequencyistwicetheoutputfrequency. T T DV A= COMP DV (4) CurrentsensegainAisdefinedby: CS ,0V£ V £ 0.8V. CS (5) ParametermeasuredattrippointoflatchwithFB=0V. (6) CSblanktimeismeasuredasthedifferencebetweentheminimumnon-zeroon-timeandtheCS-to-OUTdelay. SubmitDocumentationFeedback 3

UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 ELECTRICAL CHARACTERISTICS (continued) Allparametersarethesameforbothchannels,–40°C£ T £ 85°CfortheUCC2810,0°C£ T £ 70°CfortheUCC3810, A A V =10V;R =150kW ,C =120pF;noload;T =T (unlessotherwisespecified) CC T T A J; PARAMETER TESTCONDITIONS MIN TYP MAX UNIT PWM R =150kW , C =120pF 45% 49% 50% Maximumdutycycle(2) T T R =30kW , C =120pF 40% 45% 48% T T Minimumon-time CS=1.2V, COMP=5V 130 ns OUTPUT I =20mA 0.12 0.42 OUT V Low-leveloutputvoltage I =200mA 0.48 1.10 OL OUT I =20mA, V =0V 0.7 1.2 V OUT CC I =–20mA 0.15 0.42 OUT V High-leveloutputvoltage(V –OUT) OH CC I =–200mA 1.2 2.3 OUT t Risetime,OUT C =1nF 20 50 R OUT ns t Falltime,OUT C =1nF 30 60 F OUT UNDERVOLTAGELOCKOUT(UVLO) Startthresholdvoltage 9.6 11.3 13.2 Stopthresholdvoltage 7.1 8.3 9.5 V Start-to-stophysteresis 1.7 3.0 4.7 ENABLE2inputbiascurrent ENABLE2=0V -20 -35 -55 µA ENABLE2inputthresholdvoltage 0.80 1.53 2.00 V OVERALL Startupcurrent V <Startthresholdvoltage 0.15 0.25 CC Operatingsupplycurrent,outputsoff VCC=10V, FB=2.75V 2 3 VCC=10V, FB=0V, 3.2 5.1 mA CS=0V, RT=150kW Operatingsupplycurrent,outputson VCC=10V, FB=0V, 8.5 14.5 CS=0V, RT=30kW VCCinternalzenervoltage I =10mA 11.0 12.9 14.0 CC VCCinternalzenervoltageminusstart 0.4 1.2 V thresholdvoltage 4 SubmitDocumentationFeedback

UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 DEVICE INFORMATION TERMINALFUNCTIONS TERMINAL I/O DESCRIPTION NAME NO. COMP1 5 O Lowimpedanceoutputoftheerroramplifiers. COMP2 12 O CS1 6 I CurrentsenseinputstothePWMcomparators.Theseinputshaveleadingedgeblanking.For mostapplications,noinputfilteringisrequired.LeadingedgeblankingdisconnectstheCSinputs fromallinternalcircuitsforthefirst55nsofeachPWMcycle.Whenusedwithveryslowdiodesor CS2 11 I inotherapplicationswherethecurrentsensesignalisunusuallynoisy,asmallcurrent-senseR-C filtermayberequired. Thetimingcapacitoroftheoscillator.RecommendedvaluesofCTarebetween100pFand1nF. CT 2 O ConnectthetimingcapacitordirectlyacrossCTandGND. AlogicinputwhichdisablesPWM2whenlow.ThisinputhasnoeffectonPWM1.Thisinputis internallypulledhigh.Inmostapplicationsitcanbeleftfloating.Inunusuallynoisyapplications, ENABLE2 14 I theinputshouldbebypassedwitha1-nFceramiccapacitor.ThisinputhasTTLcompatible thresholds. FB1 4 I Thehighimpedanceinvertinginputsoftheerroramplifiers. FB2 13 I Toseparatenoisefromthecriticalcontrolcircuits,thisparthastwodifferentgroundconnections: GND 8 – GNDandPWRGND.GNDandPWRGNDmustbeelectricallyconnectedtogether.However,use caretoavoidcouplingnoiseintoGND. OUT1 7 O Thehigh-currentpush-pulloutputsofthePWMareintendedtodrivepowerMOSFETgates throughasmallresistor.Thisresistoractsasbothacurrentlimitingresistorandasadamping OUT2 10 O impedancetominimizeringingandovershoot. Toseparatenoisefromthecriticalcontrolcircuits,thisparthastwodifferentgroundconnections: PWRGND 9 – GNDandPWRGND.GNDandPWRGNDmustbeelectricallyconnectedtogether. Theoutputofthe5-Vreference.BypassREFtoGNDwithaceramiccapacitor‡ 0.01-µFforbest REF 15 O performance. TheoscillatorchargingcurrentissetbythevalueoftheresistorconnectedfromRTtoGND.This pinisregulatedto1V,buttheactualchargingcurrentis10V/RT.RecommendedvaluesofRT RT 3 O arebetween10kW and470kW .Foragivenfrequency,highertimingresistorsgivehigher maximumdutycycleandslightlyloweroverallpowerconsumption. Thislogicinputcanbeusedtosynchronizetheoscillatortoafreerunningoscillatorinanother SYNC 1 I part.ThispinisedgetriggeredwithTTLthresholds,andrequiresatleasta10-ns-widepulse.If unused,thispincanbegrounded,opencircuited,orconnectedtoREF. Thepowerinputtothedevice.Thispinsuppliescurrenttoallfunctionsincludingthehighcurrent VCC 16 I outputstagesandtheprecisionreference.Therefore,itiscriticalthatVCCbedirectlybypassedto PWRGNDwithan0.1-µFceramiccapacitor. SubmitDocumentationFeedback 5

UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 APPLICATION INFORMATION TIMING RESISTOR SupplycurrentdecreaseswithincreasedR bytherelationship: T 11V DI = CC R T Formoreinformation,seethedetailedoscillatorblockdiagram. LEADING EDGE BLANKING AND CURRENT SENSE Figure 1 shows how an external power stage is connected to the UCC3810. The gate of an external power N-channel MOSFET is connected to OUT through a small current-limiting resistor. For most applications, a 10-W resistor is adequate to limit peak current and also practical at damping resonances between the gate driver and the MOSFET input reactance. Long gate lead length increases gate capacitance and mandates a higher series gate resistor to damp the R-L-C tank formed by the lead, the MOSFET input reactance, and the device’s driver outputresistance. The UCC3810 features internal leading edge blanking of the current-sense signal on both current sense inputs. The blank time starts when OUT rises and continues for 55 ns. During that 55 ns period, the signal on CS is ignored. For most PWM applications, this means that the CS input can be connected to the current-sense resistor as shown in Figure 1. However, high speed grounding practices and short lead lengths are still required forgoodperformance. From Over−Current Oscillator S Comparator 1.5 V − Soft R Q Power Start + OUT Stage Gate Driver + CS R − Current + PWM PWM Sense − Comparator Latch Resistor One Error Shot Amp Figure1.DetailedBlockDiagram OSCILLATOR The UCC3810 oscillator generates a sawtooth wave at CT. The sawtooth rise time is set by the resistor from RT to GND. Since R is biased at 1 V, the current through R is 1 V/R . The actual charging current is 10 times T T T higher. The fall time is set by an internal transistor on-resistance of approximately 100 W . During the fall time, all outputs are off and the maximum duty cycle is reduced to below 50%. Larger timing capacitors increase the discharge time and reduce frequency. However, the percentage maximum duty cycle is only a function of the timingresistorR ,andtheinternal100-W dischargeresistance. T ERROR AMPLIFIER OUTPUT STAGE The UCC3810 error amplifiers are operational amplifiers with low-output resistance and high-input resistance. The output stage of one error amplifier is shown in Figure 3. This output stage allows the error amplifier output toswingclosetoGNDandashighasonediodedropbelow5Vwithlittlelossinamplifierperformance. 6 SubmitDocumentationFeedback

UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 APPLICATION INFORMATION (continued) VCC 0.2 V + − I 10I R Q 1 V + + − RON (cid:1) 100 2.5 V − S One Shot 3 2 1 RT SYNC RT CT Figure2.Oscillator 5 V VCC COMP Figure3.ErrorAmplifierOutputStage SubmitDocumentationFeedback 7

UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 TYPICAL CHARACTERISTICS ERRORAMPLIFERGAINANDPHASE OSCILLATORFREQUENCY vs vs FREQUENCY TIMINGRESISTANCE 80 1 M 60 135 z H − Fhase y B 40 90 nc d e Gain − 20 Gain 45 °hase − ator Frequ 100 k P cill s O 0 0 −20 10 k 1 k 10 k 100 k 1 M 10 M 10 k 100 k 10 M f − Frequency − Hz RT − Timing Resistor − (cid:1) Figure4. Figure5. OSCILLATORFREQUENCY MAXIMUMDUTYCYCLE vs vs TEMPERATURE TIMINGRESISTANCE 1.2 50 1.15 48 Hz 1.1 M − cy 1.05 % uen e − 46 Freq 1 Cycl ator 0.95 Duty 44 cill s O 0.9 42 0.85 0.8 40 −55 −35 −15 5 25 45 65 85 105 125 10 k 100 k 1 M TA − Temperature − (cid:2)C RT − Timing Resistor − (cid:1) Figure6. Figure7. 8 SubmitDocumentationFeedback

UCC2810 UCC3810 www.ti.com SLUS162D–FEBRUARY1999–REVISEDFEBRUARY2007 TYPICAL CHARACTERISTICS (continued) INPUTCURRENT MAXIMUMDUTYCYCLE vs vs OSCILLATORFREQUENCY FREQUENCY 10 50 8 48 A m − ent 6 − % 46 Curr ycle nput 4 Switching uty C 44 − I D C C I 2 42 Outputs Off CT = 120 pF 40 10 k 100 k 1 M 10 k 100 k 1 M f − Frequency − Hz f − Frequency − Hz Figure8. Figure9. DC +12 V OUT Input +5 V OUT 0.1 (cid:1)F 16 OPTO1 VCC 2 3 5 COMP1 COMP VCC OUT1 7 5 REF 0.1 OPTO1 4 FB1 COLL 1 UCC3810 4 E/A+ OPTO2 12 COMP2 CS1 6 0.1 6 SENSEISET 8 OUT2 10 UC39432GND 7 13 FB2 TTL MONITOR CS2 11 High Voltage Out SYNC 1 SYNC (Monitor Raster) REF 15 HV SUP 14 ENABLE2 ENABLE PWR RT CT GND GND 0.1 3 2 8 9 2 3 COMP VCC 0.1 OPTO2 5 REF COLL 1 4 E/A+ 0.1 6 SENSEISET 8 GND UC39432 7 VDG−94022 Figure10.TypicalApplication SubmitDocumentationFeedback 9

PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 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) UCC3810DWTR SOIC DW 16 2000 330.0 16.4 10.75 10.7 2.7 12.0 16.0 Q1 PackMaterials-Page1

PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *Alldimensionsarenominal Device PackageType PackageDrawing Pins SPQ Length(mm) Width(mm) Height(mm) UCC3810DWTR SOIC DW 16 2000 367.0 367.0 38.0 PackMaterials-Page2

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