tl494的dc-dc電源的效率能否達到80以上輸出5v2a

1、张飞实战电子官方网站： 点击打开 （广告勿扰100%拒绝水贴，10名疯狂工程师运营的网T站L，4有94问C必, T答L）494I, TL494M, TL494YPULSE-WIDTH-MODULATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995Complete PWM Power Control CircuitryUncommitted Outputs for 200-mA Sink or Source CurrentOutput Control Selects Single-Ended

2、 or Push-Pull OperationInternal Circuitry Prohibits Double Pulse at Either OutputVariable Dead Time Provides Control Over Total RangeInternal Regulator Provides a Stable 5-V Reference Supply With 5% ToleranceCircuit Architecture Allows Easy SynchronizationTL494C, TL494I . D, N, OR PW PACKAGE TL494M

3、. J PACKAGE(TOP VIEW)1IN+1IN FEEDBACKDTC CT RT GNDC12IN+2IN REFOUTPUT CTRL VCCC2E2 E112345678161514131211109TL494M . FK PACKAGE(TOP VIEW)descriptionThe TL494 incorporates on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control circuit. Designed

4、primarily for power supply control, this device offers the systems engineer the flexibility to tailor the power supply control circuitry to a specific application.The TL494 contains two error amplifiers, an on- chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering contro

5、l flip- flop, a 5-V, 5%-precision regulator, and output- control circuits.The error amplifiers exhibit a common-mode342120 19REFOUTPUT CTRL NCVCC C2FEEDBACKDTC NC CT RT181716155678149 10 11 12 13NC No internal connectionFUNCTION TABLEvoltage range from 0.3 V toVCC 2 V. Thedead-time control comparato

6、r has a fixed offset that provides approximately 5% dead time. The on-chip oscillator may be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it may drive the common circuitsinsynchronousmultiple-railpower supplies.AVAILABLE OPTIONS The D package is availab

7、le taped and reeled. Add R suffix to device type (e.g., TL494CDR). The PW package is only available left-end taped and reeled.Copyright 1995, Texas Instruments IncorporatedOnproductscompliant toMIL-STD-883, Class B, all parametersare tested unless otherwise noted. On all other products, production p

8、rocessingdoesnotnecessarilyincludetestingofall parameters.PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standardwarranty. Productionprocessingdoes not necessarilyinclude testingofallparameters.POST OFFICE BOX 6553

9、03 DALLAS, TEXAS 75265张飞实战电子官方网站： 点击打开41GND C1 NC E1 E21IN1IN+ NC 2IN+2INTAPACKAGED DEVICESCHIP FORM (Y)SURFACE MOUNT (D)CHIP CARRIER (FK)CERAMIC DIP (J)PLASTIC DIP (N)SHRINK SMALL OUTLINE(PW)0C to 70CTL494CDTL494CNTL494CPWTL494Y40C to 85CTL494IDTL494IN55C to 125CTL494MFKTL494MJINP

10、UT TO OUTPUT CTRLOUTPUT FUNCTIONVI = GNDSingle-ended or parallel outputVI = VrefNormal push-pull operation张飞实战电子官方网站： 点击打开 TL494C, TL494I,（T广L告49勿4扰M1,0T0L%拒49绝4水Y贴，10名疯狂工程师运营的网站，有问必答）PULSE-WIDTH-MODULATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995description (continu

11、ed)The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 provides for push-pull or single-ended output operation, which may be selected through the output- control function. The architecture of this device prohibits the possibility of eithe

12、r output being pulsed twice during push-pull operation.The TL494C is characterized for operation from 0C to 70C. The TL494I is characterized for operation from 40C to 85C. The TL494M is characterized for operation from 55C to 125C.functional block diagramOUTPUT CTRL(see Function Table)136RT CTOscill

13、ator5Q181DC1Dead-Time Control Comparator9 0.1 VE14C1DTCQ2PWMComparator11C2Error Amplifier 1 11IN+10+ E21IN 2Pulse-Steering Flip-Flop12VCCError Amplifier 2 16+ 2IN+ 152IN14Reference RegulatorREF7GND30.7 mAFEEDBACKNOTE A.The terminal numbers indicated apply only to the D, J, N, and PW packages.POST OF

14、FICE BOX 655303 DALLAS, TEXAS 75265张飞实战电子官方网站： 点击打开42张飞实战电子官方网站： 点击打开 （广告勿扰100%拒绝水贴，10名疯狂工程师运营的网站TL，4有9问4C必,答TL）494I, TL494M, TL494YPULSE-WIDTH-MODULATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995TL494Y chip informationThis chip, when properly assemb

15、led, display characteristics similar to the TL494C. Thermal compression or ultrasonic bonding may be used on the doped aluminum bonding pads. The chips may be mounted with conductive epoxy or a gold-silicon preform.POST OFFICE BOX 655303 DALLAS, TEXAS 75265张飞实战电子官方网站： 点击打开43BONDING

16、 PAD ASSIGNMENTS(14)(13)(12)(15)(11)(16)CHIP THICKNESS: 15 MILS TYPICAL(10)BONDING PADS: 4 4 MILS MINIMUM 80TJmax = 150C(9)TOLERANCES ARE 10%.ALL DIMENSIONS ARE IN MILS.(1)(8)(2)(7)(3)(4)(5)(6)941IN+ (1)(16)2IN+1IN (2)(15)2INFEEDBACK (3)(14)REFDTC (4) (13) OUTPUT CTRL TL494YCT (5)(12) VCCRT (6)(11)

17、C2GND (7)(10)E2C1 (8) (9) E1张飞实战电子官方网站： 点击打开 TL494C, TL494I,（T广L告49勿4扰M1,0T0L%拒49绝4水Y贴，10名疯狂工程师运营的网站，有问必答）PULSE-WIDTH-MODULATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Stress

18、es beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolut

19、e-maximum-rated conditions for extended periods may affect device reliability.NOTE 1: All voltage values, except differential voltages, are with respect to the network ground terminal.DISSIPATION RATING TABLErecommended operating conditionsPOST OFFICE BOX 655303 DALLAS, TEXAS 75265张飞实战电子官方网站：www.zha

20、 点击打开44TL494CTL494ITL494MUNITMINMAXMINMAXMINMAXSupply voltage, VCC740740740VAmplifier input voltage, VI 0.3 VCC 2 0.3 VCC 2 0.3 VCC 2VCollector output voltage, VO404040VCollector output current (each transistor)200200200mACurrent into feedback terminalmAOscillator frequency, fosc

21、130013001300kHzTiming capacitor, CT0.47100000.47100000.4710000nFTiming resistor, RT1.85001.85001.8500kWOperating free-air temperature, TA070408555125CPACKAGETA 25CDERATINGDERATETA = 70CTA = 85CTA = 125C POWER RATINGFACTORABOVE TAPOWER RATING POWER RATING POWER RATINGD900 mW7.6 mW/C25C558 mW444 mWFK1

22、375 mW11.0 mW/C25C880 mW715 mW275 mWJ1375 mW11.0 mW/C25C880 mW715 mW275 mWN1000 mW9.2 mW/C41C733 mW595 mW PW700 mW5.6 mW/C25C448 mWTL494CTL494ITL494MUNITSupply voltage, VCC (see Note 1)414141VAmplifier input voltage, VIVCC + 0.3VCC + 0.3VCC + 0.3VCollector output voltage, VO414141VCollector output c

23、urrent, IO250250250mAContinuous total power dissipationSee Dissipation Rating TableOperating free-air temperature range, TA0 to 70 40 to 8555 to 125CStorage temperature range, Tstg 65 to 150 65 to 150 65 to 150CCase temperature for 60 seconds, TC: FK package260CLead temperature 1,6 mm (1/16 inch) fr

24、om case for 10 seconds: D, N, or PW package260260CLead temperature 1,6 mm (1/16 inch) from case for 10 seconds: J package300C张飞实战电子官方网站： 点击打开 （广告勿扰100%拒绝水贴，10名疯狂工程师运营的网站TL，4有9问4C必,答TL）494I, TL494M, TL494YPULSE-WIDTH-MODULATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995

25、electrical characteristics over recommended operating free-air temperature range, VCC = 15 V, f = 10 kHz (unless otherwise noted)reference section* On products compliant to MIL-STD-883, Class B, this parameter is not production tested. For conditions shown as MIN or MAX, use the appropriate value sp

26、ecified under recommended operating conditions. All typical values except for parameter changes with temperature are at TA = 25C. Duration of the short circuit should not exceed one second.oscillator section, CT = 0.01 mF, RT = 12 kW (see Figure 1)*On products compliant to MIL-STD-883, Class B, this

27、 parameter is not production tested. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.N All typical values except for parameter changes with temperature are at TA = 25C. Standard deviation is a measure of the statistical distribution abou

28、t the mean as derived from the formula:# Temperature coefficient of timing capacitor and timing resistor not taken into account.(xnX)2n 1 N 1error amplifier section (see Figure 2)All typical values except for parameter changes with temperature are at TA = 25C.POST OFFICE BOX 655303 DALLAS, TEXAS 752

29、65张飞实战电子官方网站： 点击打开45PARAMETERTEST CONDITIONSTL494C, TL494I TL494MUNITMINTYPMAXInput offset voltageVO (FEEDBACK) = 2.5 V210mVInput offset currentVO (FEEDBACK) = 2.5 V25250nAInput bias currentVO (FEEDBACK) = 2.5 V0.21mACommon-mode input voltage rangeVCC = 7 V to 40 V 0.3 to VCC 2VOpe

30、n-loop voltage amplificationDVO = 3 V,RL = 2 kW,VO = 0.5 V to 3.5 V7095dBUnity-gain bandwidthVO = 0.5 V to 3.5 V,RL = 2 kW800kHzCommon-mode rejection ratioDVO = 40 V,TA = 25C6580dBOutput sink current (FEEDBACK)VID = 15 mV to 5 V,V (FEEDBACK) = 0.7 V0.30.7mAOutput source current (FEEDBACK)VID = 15 mV

31、 to 5 V,V (FEEDBACK) = 3.5 V2mAPARAMETERTEST CONDITIONSTL494C, TL494ITL494MUNITMIN TYPMAXMIN TYPMAXFrequency1010kHzStandard deviation of frequencyAll values of VCC, CT, RT, and TA con- stant100100Hz/kHzFrequency change with voltageVCC = 7 V to 40 V,TA = 25C11Hz/kHzFrequency change with temperature#D

32、TA = MIN to MAX1010*Hz/kHzPARAMETERTEST CONDITIONSTL494C, TL494ITL494MUNITMIN TYPMAXMIN TYPMAXOutput voltage (REF)IO = 1 mA4.7555.254.7555.25VInput regulationVCC = 7 V to 40 V225225mVOutput regulationIO = 1 mA to 10 mA115115mVOutput voltage change with temperatureDTA = MIN to MAX210230*mV/VShort-cir

33、cuit output currentREF = 0 V2525mA张飞实战电子官方网站： 点击打开 TL494C, TL494I,（T广L告49勿4扰M1,0T0L%拒49绝4水Y贴，10名疯狂工程师运营的网站，有问必答）PULSE-WIDTH-MODULATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995electrical characteristics over recommended operating free-air temperature range, VCC = 15 V

34、,f = 10 kHz, TA = 25C (unless otherwise noted)reference sectionoscillator section, CT = 0.01 mF, RT = 12 kW (see Figure 1)error amplifier section (see Figure 2) All typical values except for parameter changes with temperature are at TA = 25C. Duration of the short circuit should not exceed one secon

35、d. Standard deviation is a measure of the statistical distribution about the mean as derived from the formula:N (x X)2nn1N1POST OFFICE BOX 655303 DALLAS, TEXAS 75265张飞实战电子官方网站： 点击打开46PARAMETERTEST CONDITIONSTL494YUNITMINTYPMAXInput offset voltageVO (FEEDBACK) = 2.5 V2mVInput offset

36、 currentVO (FEEDBACK) = 2.5 V25nAInput bias currentVO (FEEDBACK) = 2.5 V0.2mAOpen-loop voltage amplificationDVO = 3 V,RL = 2 kW,VO = 0.5 V to 3.5 V95dBUnity-gain bandwidthVO = 0.5 V to 3.5 V,RL = 2 kW800kHzCommon-mode rejection ratioDVO = 40 V,TA = 25C80dBOutput sink current (FEEDBACK)VID = 15 mV to

37、 5 V,V (FEEDBACK) = 0.7 V0.7mAPARAMETERTEST CONDITIONSTL494YUNITMIN TYPMAXFrequency10kHzStandard deviation of frequencyAll values of VCC, CT, RT, and TA constant100Hz/kHzFrequency change with voltageVCC = 7 V to 40 V,TA = 25C1Hz/kHzPARAMETERTEST CONDITIONSTL494YUNITMIN TYPMAXOutput voltage (REF)IO =

38、 1 mA5VInput regulationVCC = 7 V to 40 V2mVOutput regulationIO = 1 mA to 10 mA1mVShort-circuit output currentREF = 0 V25mA张飞实战电子官方网站： 点击打开 （广告勿扰100%拒绝水贴，10名疯狂工程师运营的网站TL，4有9问4C必,答TL）494I, TL494M, TL494YPULSE-WIDTH-MODULATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995ele

39、ctrical characteristics over recommended operating free-air temperature range, VCC = 15 V, f = 10 kHz (unless otherwise noted)output sectionAll typical values except for temperature coefficient are at TA = 25C.dead-time control section (see Figure 1)*On products compliant to MIL-STD-883, Class B, th

40、is parameter is not production tested. All typical values except for temperature coefficient are at TA = 25C.PWM comparator section (see Figure 1)All typical values except for temperature coefficient are at TA = 25C.total deviceAll typical values except for temperature coefficient are at TA = 25C.PO

41、ST OFFICE BOX 655303 DALLAS, TEXAS 75265张飞实战电子官方网站： 点击打开47PARAMETERTEST CONDITIONSTL494C, TL494I TL494YTL494MUNITMIN TYPMAXMIN TYPMAXStandby supply currentRT = Vref,All other inputs and outputs openVCC = 15 V610621mAVCC = 40 V915926Average supply currentVI (DEAD-TIME CTRL) = 2 V,Se

42、e Figure 17.57.5mAPARAMETERTEST CONDITIONSTL494C, TL494I TL494M, TL494YUNITMIN TYPMAXInput threshold voltage (FEEDBACK)Zero duty cycle44.5VInput sink current (FEEDBACK)V (FEEDBACK) = 0.7 V0.30.7mAPARAMETERTEST CONDITIONSTL494C, TL494I TL494YTL494MUNITMIN TYPMAXMIN TYPMAXInput bias current (DEAD-TIME

43、 CTRL)VI = 0 to 5.25 V210210mAMaximum duty cycle, each outputVI (DEAD-TIME CTRL) = 0, CT = 0.1 mF, RT = 12 kW45%45%50%*Input threshold voltage (DEAD-TIME CTRL)Zero duty cycle33.333.3VMaximum duty cycle00*PARAMETERTEST CONDITIONSTL494C, TL494I TL494M, TL494YUNITMIN TYPMAXCollector off-state currentVC

44、E = 40 V,VCC = 40 V2100mAEmitter off-state currentVCC = VC = 40 V,VE = 0 100mACollector-emitter saturation voltageCommon emitterVE = 0,IC = 200 mA1.11.3VEmitter followerVO(C1 or C2) = 15 V, IE = 200 mA1.52.5Output control input currentVI = Vref3.5mA张飞实战电子官方网站： 点击打开 TL494C, TL494I,（

45、T广L告49勿4扰M1,0T0L%拒49绝4水Y贴，10名疯狂工程师运营的网站，有问必答）PULSE-WIDTH-MODULATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995electrical characteristics over recommended operating free-air temperature range, VCC = 15 V, f = 10 kHz (unless otherwise noted) (continued)switching characteristics, TA = 25C*

46、On products compliant to MIL-STD-883, Class B, this parameter is not production tested. All typical values except for temperature coefficient are at TA = 25C.POST OFFICE BOX 655303 DALLAS, TEXAS 75265张飞实战电子官方网站： 点击打开48PARAMETERTEST CONDITIONSTL494C, TL494I TL494YTL494MUNITMIN TYPMA

47、XMIN TYPMAXRise timeCommon-emitter configuration,See Figure 3100200100200*nsFall time2510025100*nsRise timeEmitter-follower configuration,See Figure 4100200100200*nsFall time4010040100*ns张飞实战电子官方网站： 点击打开 （广告勿扰100%拒绝水贴，10名疯狂工程师运营的网站TL，4有9问4C必,答TL）494I, TL494M, TL494YPULSE-WIDTH-MODU

48、LATIONCONTROLCIRCUITSSLVS074A JANUARY 1983 REVISED AUGUST 1995PARAMETER MEASUREMENT INFORMATIONVCC = 15 V150 W2 W150 W2 W12VCC 4 8Output 1DTCFEEDBACKC1Test Inputs 3 9E112 kW611C2Output 2RT510CTE20.01 mF11IN+1IN2IN+2IN2Error Amplifiers16151314OUTPUT CTRLREFGND50 kW7TEST CIRCUITVCCVoltage at C1 0 VVCCVoltage at C2 0 VVoltage at CTThreshold VoltageDTC0 VThreshold VoltageFEEDBACK0.7 VDuty Cycle0%MAX0%VOLTAGE WAVEFORMSFigure 1. Operational Test Circuit and WaveformsPOST OFFICE BOX 655303 DALLAS, TEXAS 75265张飞实战电子官方网站： 点击打开49张飞实战电子官方网站： 点击打开 TL494C, TL494I,