UC1524 UC2524 UC3524 www.ti.com SLUS180E–NOVEMBER1999–REVISEDOCTOBER2005 ADVANCED REGULATING PULSE WIDTH MODULATORS FEATURES DESCRIPTION • CompletePWMPowerControlCircuitry The UC1524, UC2524 and UC3524 incorporate on a • UncommittedOutputsforSingle-Endedor singlemonolithicchipallthefunctions required for the Push-PullApplications construction of regulating power supplies, inverters or switching regulators. They can also be used as the • LowStandbyCurrent...8mATypical control element for high-power-output applications. • InterchangeableWithSG1524,SG2524and The UC1524 family was designed for switching SG3524,Respectively regulators of either polarity, transformer-coupled dc-to-dc converters, transformerless voltage doublers and polarity converter applications employing fixed- frequency, pulse-width modulation techniques. The dual alternating outputs allow either single-ended or push-pull applications. Each device includes an on-chip reference, error amplifier, programmable oscillator, pulse-steering flip-flop, two uncommitted output transistors, a high-gain comparator, and current-limiting and shut-down circuitry. The UC1524 is characterized for operation over the full military temperature range of –55(cid:176) C to 125(cid:176) C. The UC2524 and UC3524 are designed for operation from –25(cid:176) C to85(cid:176) Cand0(cid:176) Cto70(cid:176) C,respectively. BLOCK DIAGRAM VREF OSC OUT 16 3 +5VTOALL VIN 15 REFERENCE INTERNAL +5V 12 CA Q RT 6 OSC R Q CT 7 11 EA (RAMP) 13 CB +5V +5V INV INPUT 1 ! COMPARATOR EA NI INPUT 2 + 14 EB GROUND 8 10k 5 !SENSE 1k C L 4 +SENSE 10 9 SHUTDOWN COMPENSATION Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet. PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©1999–2005,TexasInstrumentsIncorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarilyincludetestingofallparameters.

UC1524 UC2524 UC3524 www.ti.com SLUS180E–NOVEMBER1999–REVISEDOCTOBER2005 CONNECTION DIAGRAM VREF VIN EB CB CA EA S/D COMP 16 15 14 13 12 11 10 9 REFERENCE REGULATOR S/D ERROR CURRENT AMP AMP ! + + ! OSCILLATOR 1 2 3 4 5 6 7 8 INV INPUT NIONNP UINTV OSC OUTSENCSLE(+) SENCSLE (!-) RT CT GND ABSOLUTE MAXIMUM RATINGS overoperatingfree-airtemperaturerange(unlessotherwisenoted) UNIT V Supplyvoltage(1)(2) 40V CC Collectoroutputcurrent 100mA Referenceoutputcurrent 50mA CurrentthroughC terminalg –50mA T T =25(cid:176) C(3) 1000mW A Powerdissipation T =25(cid:176) C(3) 2000mW C Operatingjunctiontemperaturerange –55(cid:176) Cto150(cid:176) C Storagetemperaturerange –65(cid:176) Cto+150(cid:176) C (1) Allvoltagevaluesarewithrespecttothegroundterminal,pin8. (2) Thereferenceregulatormaybebypassedforoperationfromafixed5VsupplybyconnectingtheV andreferenceoutputpinsbothto CC thesupplyvoltage.Inthisconfigurationthemaximumsupplyvoltageis6V. (3) Consultpackagingsectionofdatabookforthermallimitationsandconsiderationsofpackage. RECOMMENDED OPERATING CONDITIONS overoperatingfree-airtemperaturerange(unlessotherwisenoted) MIN NOM MAX UNIT V Supplyvoltage 8 40 V CC Referenceoutputcurrent 0 20 mA CurrentthroughC terminal –0.03 –2 mA T R Timingresistor 1.8 100 kW T C Timingcapacitor 0.001 0.1 m F T UC1524 –55 125 Operatingambienttemperaturerange UC2524 –25 85 (cid:176) C UC3524 0 70 2

UC1524 UC2524 UC3524 www.ti.com SLUS180E–NOVEMBER1999–REVISEDOCTOBER2005 ELECTRICAL CHARACTERISTICS thesespecificationsapplyforT =–55(cid:176) Cto125(cid:176) CfortheUC1524,–25(cid:176) Cto85(cid:176) CfortheUC2524,and0(cid:176) Cto70(cid:176) Cforthe A UC3524,V =20V,andf=20kHz,T =T,overoperatingfree-airtemperaturerange(unlessotherwisenoted) IN A J UC1524/UC2524 UC3524 PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX REFERENCESECTION Outputvoltage 4.8 5.0 5.2 4.6 5.0 5.4 V Lineregulation V =8Vto40V 10 20 10 30 mV IN Loadregulation I =0mAto20mA 20 50 20 50 mV L Ripplerejection f=120Hz,T =25(cid:176) C 66 66 dB J Shortcircuitcurrentlimit V =0,T =25(cid:176) C 100 100 mA REF J Temperaturestability Overoperatingtemperaturerange 0.3% 1% 0.3% 1% Longtermstability T =125(cid:176) C,t=1000Hrs 20 20 mV J OSCILLATORSECTION Maximumfrequency C =1nF,R =2kW 300 300 kHz T T Initialaccuracy R andC constant 5% 5% T T Voltagestability V =8Vto40V,T =25(cid:176) C 1% 1% IN J Temperaturestability Overoperatingtemperaturerange 5% 5% Outputamplitude Pin3,T =25(cid:176) C 3.5 3.5 V J Outputpulsewidth C =0.01mfd,T =25(cid:176) C 0.5 0.5 m s T J ERRORAMPLIFIERSECTION Inputoffsetvoltage V =2.5V 0.5 5 2 10 mV CM Inputbiascurrent V =2.5V 2 10 2 10 m A CM Openloopvoltagegain 72 80 60 80 dB Commonmodevoltage T =25(cid:176) C 1.8 3.4 1.8 3.4 V J Commonmoderejectionratio T =25(cid:176) C 70 70 dB J Smallsignalbandwidth A =0dB,T =25(cid:176) C 3 3 MHz V J Outputvoltage T =25(cid:176) C 0.5 3.8 0.5 3.8 V J COMPARATORSECTION Duty-cycle %Eachoutputon 0% 45% 0% 45% Zeroduty-cycle 1 1 Inputthreshold V Maximumduty-cycle 3.5 3.5 Inputbiascurrent 1 1 m A CURRENTLIMITINGSECTION Sensevoltage Pin9=2Vwitherroramplifiersetfor 190 200 210 180 200 220 mV maximumout,T =25(cid:176) C J SensevoltageT.C. 0.2 0.2 mV/(cid:176) C T =–55(cid:176) Cto85(cid:176) Cforthe–1Vto1Vlimit –1 1 –1 1 J Commonmodevoltage V T =25(cid:176) C –0.3 1 J OUTPUTSECTION(EACHOUTPUT) Collector-emittervoltage 40 40 V Collectorleakagecurrent V =40V 0.1 50 0.1 50 m A CE Saturationvoltage I =50mA 1 2 1 2 V C Emitteroutputvoltage V =20V 17 18 17 18 V IN RiseTime R =2kW ,T =25(cid:176) C 0.2 0.2 m s C J FallTime R =2kW ,T =25(cid:176) C 0.1 0.1 m s C J Totalstandbycurrent(Note) V =40V 8 10 8 10 mA IN 3

UC1524 UC2524 UC3524 www.ti.com SLUS180E–NOVEMBER1999–REVISEDOCTOBER2005 PRINCIPLES OF OPERATION flip-flop, which is synchronously toggled by the The UC1524 is a fixed-frequency pulse-width-modu- oscillator output. The oscillator output pulse also lation voltage regulator control circuit. The regulator serves as a blanking pulse to assure both outputs are operates at a frequency that is programmed by one never on simultaneously during the transition times. timing resistor (R ), and one timing capacitor (C ), R T T T The width of the blanking pulse is controlled by the establishes a constant charging current for C . This T valve of C . The outputs may be applied in a results in a linear voltage ramp at C , which is fed to T T push-pull configuration in which their frequency is half the comparator providing linear control of the output that of the base oscillator Note that for buck regulator pulse width by the error amplifier. The UC1524 topologies, the two outputs can be wire-ORed for an contains an on-board 5 V regulator that serves as a effective 0-90% duty cycle range. With this reference as well as powering the UC1524’s internal connection, the output frequency is the same as the control circuitry and is also useful in supplying oscillator frequency. The output of the error amplifier external support functions. This reference voltage is shares a common input to the comparator with the lowered externally by a resistor divider to provide a current limiting and shutdown circuitry and can be reference within the common-mode range of the error overridden by signals from either of these inputs. This amplifier or an external reference may be used. The common point is also available externally and may be power supply output is sensed by a second resistor employed to control the gain of, or to compensate, divider network to generate a feedback signal to the the error amplifier or to provide additional control to error amplifier. The amplifier output voltage is then theregulator. compared to the linear voltage ramp at C . The T resulting modulated pulse out of the high-gain comparator is then steered to the appropriate output pass transistor (Q or Q ) by the pulse-steering 1 2 4

UC1524 UC2524 UC3524 www.ti.com SLUS180E–NOVEMBER1999–REVISEDOCTOBER2005 TYPICAL CHARACTERISTICS OPEN-LOOPVOLTRAGEAMPLIFICATION OSCILLATORFREQUENCY OFERRORAMPLIFIER vs vs TIMINGCOMPONENTS FREQUENCY 90 1 M RF= VIN= 20 V CT= 0.001mF VIN= 20 V dB 80 RF= 1M TJ= 25 C CT= 0.003mF TJ= 25 C ! 70 mplification 6500 RRFF== 310000 kk !uencyHz 100 k CT= 0.01mF geA 40 RF= 30 k Freq 10 k Volta 30 ator op 20 scil Lo Os 1 k CT= 0.003mF en- 10 RF is Resistance From p Pin 9 to Ground O 0 NOTE: Value of RFBelow 30 kW CT= 0.1mF Will Began to Limit Maximum Duty-Cycle !10 100 100 1 k 10 k 100 k 1 M 10 M 1 2 5 10 20 50 100 f!Frequency!Hz RT!Timing Resistor!kW Figure1. Figure2. OUTPUTDEADTIME OUTPUTSATURATIONVOLTAGE vs vs TIMINGCAPACITANCEVALUE LOADCURRENT 10 4 VIN= 20 V VCC= 20 V TJ= 25 C 3.5 4 V ! 3 s e (cid:181) g ! a e olt 2.5 ead Tim 1 mitter V 2 TJ= 25TCJ= 125 C D E Output 0.4 ctor-To- 1.5 TJ=!55C olle 1 C NOTE: Dead Time = Blanking Pulse Width 0.5 Plus Outplay Delay 0.1 0 0.001 0.004 0.01 0.04 0.1 0 20 40 60 80 100 CT!Capacitance! F Load Current!mA Figure3. Figure4. 5

UC1524 UC2524 UC3524 www.ti.com SLUS180E–NOVEMBER1999–REVISEDOCTOBER2005 APPLICATION INFORMATION OSCILLATOR SYNCHRONOUS OPERATIONS The oscillator controls the frequency of the UC1524 When an external clock is desired, a clock pulse of and is programmed by R and C according to the approximately 3 V can be applied directly to the T T approximateformula: oscillator output terminal. The impedance to ground 1.18 at this point is approximately 2 kW . In this f R C configuration R C must be selected for a clock T T (1) T T periodslightlygreaterthanthatoftheexternalclock. where If two or more UC1524 regulators are to operated RTisinkW synchronously, all oscillator output terminals should C isinm F be tied together, all C terminals connected to single T T fisinkHz timing capacitor, and the timing resistor connected to asingleR ,terminal. T Practical values of C fall between 1 nF and 100 nF. T Practical values of RT fall between 1.8 kW and 100 REF 16 kW . This results in a frequency range typically from 120Hzto500kHz. 1N916 COMP 9 5 k BLANKING The output pulse of the oscillator is used as a GND 8 blanking pulse at the output. This pulse width is Figure5.ErrorAmplifierClamp controlledbythevalueofC .If small values of C are T T required for frequency control, the oscillator output pulsewidthmaystillbeincreasedbyapplyinga shunt The other R terminals can be left open or shorted to T capacitance of up to 100 pF from pin 3 to ground. If V . Minimum lead lengths should be used between REF still greater dead-time is required, it should be theC terminals. T accomplished by limiting the maximum duty cycle by clamping the output of the error amplifier. This can easilybedonewiththecircuitinFigure5. V+ +28 V +5V, 5A 5 k PIC600 R2 5 k 15 1 12 5 k 2 11 500mF 0.1mF 5 k 16 13 3 k 6 UC1524 14 1.5 k 7 4 0.02 mF 3 5 10 9 0.001mF 9 50 k V! 0.1 Figure6.Single-EndedLCSwitchingRegulatorCircuit 6

UC1524 UC2524 UC3524 www.ti.com SLUS180E–NOVEMBER1999–REVISEDOCTOBER2005 V+ +28 V 15 5 k VIN 1 k 1 W UC1524 5 k 1 12 1 k INV INPUT CA 1 W 5 V 5 k 2 11 5 A NON INV INPUT EA 2N4150 5 k + 0.1mF 100 20T 5T 1500mF 16 13 VREF CB 100 20T 5T 2 k 6 14 RT EB 2N4150 0.1mF 7 4 CT CLSENSE(+) 0.1 k 3 5 OSC OUT CLSENSE(!) 0.001 mF 10 9 SD COMP 500mF GND 50 k 8 Figure7.Push-PullTransformerCoupledCircuit 2 k 2 k IS 1 W 1 W VIN 15 12 OUTPUT Osc. OUT 3 UC1524 13 11 VREF 16 4 8 6 7 2 1 9 10 4 5 N.I. INV. SHUT CURRENT RAMP INPUT INPUT COMP Down LIMET VIN 8-40 V 2 k 2 k 10 k 10 k 0.1 R1 C1 1 k 1 k Figure8.OpenLoopTestCircuit 7

PACKAGE OPTION ADDENDUM www.ti.com 17-Dec-2007 PACKAGING INFORMATION OrderableDevice Status(1) Package Package Pins Package EcoPlan(2) Lead/BallFinish MSLPeakTemp(3) Type Drawing Qty UC1524J OBSOLETE CDIP J 16 TBD CallTI CallTI UC1524J/80937 OBSOLETE CDIP J 16 TBD CallTI CallTI UC1524J883B OBSOLETE CDIP J 16 TBD CallTI CallTI UC2524DW ACTIVE SOIC DW 16 40 Green(RoHS& CUNIPDAU Level-2-260C-1YEAR noSb/Br) UC2524DWG4 ACTIVE SOIC DW 16 40 Green(RoHS& CUNIPDAU Level-2-260C-1YEAR noSb/Br) UC2524DWTR ACTIVE SOIC DW 16 2000 Green(RoHS& CUNIPDAU Level-2-260C-1YEAR noSb/Br) UC2524DWTRG4 ACTIVE SOIC DW 16 2000 Green(RoHS& CUNIPDAU Level-2-260C-1YEAR noSb/Br) UC2524J OBSOLETE CDIP J 16 TBD CallTI CallTI UC2524N ACTIVE PDIP N 16 25 Green(RoHS& CUNIPDAU N/AforPkgType noSb/Br) UC2524NG4 ACTIVE PDIP N 16 25 Green(RoHS& CUNIPDAU N/AforPkgType noSb/Br) UC3524D ACTIVE SOIC D 16 40 Green(RoHS& CallTI Level-2-260C-1YEAR noSb/Br) UC3524DG4 ACTIVE SOIC D 16 40 Green(RoHS& CallTI Level-2-260C-1YEAR noSb/Br) UC3524DTR ACTIVE SOIC D 16 2500 Green(RoHS& CallTI Level-2-260C-1YEAR noSb/Br) UC3524DTRG4 ACTIVE SOIC D 16 2500 Green(RoHS& CallTI Level-2-260C-1YEAR noSb/Br) UC3524DW ACTIVE SOIC DW 16 40 Green(RoHS& CUNIPDAU Level-2-260C-1YEAR noSb/Br) UC3524DWG4 ACTIVE SOIC DW 16 40 Green(RoHS& CUNIPDAU Level-2-260C-1YEAR noSb/Br) UC3524DWTR ACTIVE SOIC DW 16 2000 Green(RoHS& CUNIPDAU Level-2-260C-1YEAR noSb/Br) UC3524DWTRG4 ACTIVE SOIC DW 16 2000 Green(RoHS& CUNIPDAU Level-2-260C-1YEAR noSb/Br) UC3524J OBSOLETE CDIP J 16 TBD CallTI CallTI UC3524N ACTIVE PDIP N 16 25 Green(RoHS& CUNIPDAU N/AforPkgType noSb/Br) UC3524NG4 ACTIVE PDIP N 16 25 Green(RoHS& CUNIPDAU N/AforPkgType noSb/Br) (1)Themarketingstatusvaluesaredefinedasfollows: ACTIVE:Productdevicerecommendedfornewdesigns. LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect. NRND:Notrecommendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartin anewdesign. PREVIEW:Devicehasbeenannouncedbutisnotinproduction.Samplesmayormaynotbeavailable. OBSOLETE:TIhasdiscontinuedtheproductionofthedevice. (2)EcoPlan-Theplannedeco-friendlyclassification:Pb-Free(RoHS),Pb-Free(RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheck http://www.ti.com/productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails. TBD:ThePb-Free/Greenconversionplanhasnotbeendefined. Pb-Free(RoHS):TI'sterms"Lead-Free"or"Pb-Free"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirements forall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesoldered Addendum-Page1

PACKAGE OPTION ADDENDUM www.ti.com 17-Dec-2007 athightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses. Pb-Free(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieand package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible)asdefinedabove. Green(RoHS&noSb/Br):TIdefines"Green"tomeanPb-Free(RoHScompatible),andfreeofBromine(Br)andAntimony(Sb)basedflame retardants(BrorSbdonotexceed0.1%byweightinhomogeneousmaterial) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. 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 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incomingmaterialsandchemicals.TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimited informationmaynotbeavailableforrelease. InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTI toCustomeronanannualbasis. Addendum-Page2

PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 TAPE AND REEL INFORMATION *Alldimensionsarenominal Device Package Package Pins SPQ Reel Reel A0(mm) B0(mm) K0(mm) P1 W Pin1 Type Drawing Diameter Width (mm) (mm) Quadrant (mm) W1(mm) UC2524DWTR SOIC DW 16 2000 330.0 16.4 10.85 10.8 2.7 12.0 16.0 Q1 UC3524DTR SOIC D 16 2500 330.0 16.4 6.5 10.3 2.1 8.0 16.0 Q1 UC3524DWTR SOIC DW 16 2000 330.0 16.4 10.85 10.8 2.7 12.0 16.0 Q1 PackMaterials-Page1

PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 *Alldimensionsarenominal Device PackageType PackageDrawing Pins SPQ Length(mm) Width(mm) Height(mm) UC2524DWTR SOIC DW 16 2000 346.0 346.0 33.0 UC3524DTR SOIC D 16 2500 346.0 346.0 33.0 UC3524DWTR SOIC DW 16 2000 346.0 346.0 33.0 PackMaterials-Page2

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