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cấu tạo thiết bị vi mạch điện tử TDA2030A18W Hi-Fi AMPLIFIER AND 35W DRIVERMarch 1995PENTAWATTORDERING NUMBERS : TDA2030AHTDA2030AVDESCRIPTIONThe TDA2030A is a monolithic IC in Pentawatt package intended for use as low frequency classAB amplifier.With VS max= 44V it is particularly suited for morereliable applications without regulated supply andfor 35W driver circuits using low-cost complemen-tary pairs.The TDA2030A provides high output current andhas very low harmonic and cross-over distortion.Further the device incorporates a short circuit pro-tection system comprising an arrangement forautomaticallylimiting the dissipated power so as tokeep the working point of the output transistorswithin their safe operating area. A conventionalthermal shut-down system is also included.TYPICAL APPLICATION1/15TEST CIRCUITPIN CONNECTION (Top view)THERMAL DATASymbol Parameter Value UnitRth (j-case)Thermal Resistance Junction-case Max 3°C/WTDA2030A2/15ABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitVsSupply Voltage± 22VViInput Voltage VsViDifferential Input Voltage± 15VIoPeak Output Current (internally limited) 3.5 APtotTotal Power Dissipation at Tcase=90°C20 WTstg,TjStorage and Junction Temperature – 40 to + 150 °CELECTRICAL CHARACTERISTICS(Refer to the test circuit, VS= ± 16V, Tamb=25oC unless otherwise specified)Symbol Parameter Test Conditions Min. Typ. Max. UnitVsSupply Voltage± 6 ± 22VIdQuiescent Drain Current 50 80 mAIbInput Bias CurrentVS= ± 22V0.2 2µAVosInput Offset VoltageVS= ± 22V ± 2 ± 20mVIosInput Offset Current ±20 ± 200nAPOOutput Power d = 0.5%, Gv= 26dBf = 40 to 15000HzRL=4ΩRL=8ΩVS=±19V RL=8Ω151013181216WBW Power BandwidthPo= 15W RL=4Ω 100 kHzSR Slew Rate 8V/µsecGvOpen Loop Voltage Gain f = 1kHz 80 dBGvClosed Loop Voltage Gain f = 1kHz 25.5 26 26.5 dBd Total Harmonic DistortionPo= 0.1 to 14W RL=4Ωf = 40 to 15 000Hz f = 1kHzPo= 0.1 to 9W, f = 40 to 15 000HzRL=8Ω0.080.030.5%%%d2Second Order CCIF IntermodulationDistortionPO= 4W, f2–f1= 1kHz, RL=4Ω 0.03 %d3Third Order CCIF IntermodulationDistortionf1= 14kHz, f2= 15kHz2f1–f2= 13kHz0.08 %eNInput Noise Voltage B = Curve AB = 22Hz to 22kHz2310µVµViNInput Noise Current B = Curve AB = 22Hz to 22kHz5080 200pApAS/N Signal to Noise RatioRL=4Ω,Rg= 10kΩ, B = Curve APO= 15WPO=1W10694dBdBRiInput Resistance (pin 1) (open loop) f = 1kHz 0.5 5MΩSVR Supply Voltage RejectionRL=4Ω,Rg= 22kΩGv= 26dB, f = 100 Hz54 dBTjThermal Shut-down JunctionTemperature145 °CTDA2030A3/15Figure 3 : Output Power versus Supply VoltageFigure 4 : Total Harmonic Distortion versusOutput Power (test using rise filters)Figure 1 : Single Supply AmplifierFigure 2 : Open Loop-frequency ResponseFigure 5 : Two Tone CCIF IntremodulationDistortionTDA2030A4/15Figure 6 : Large Signal Frequency Response Figure 7 : Maximum Allowable Power Dissipationversus Ambient TemperatureFigure 10 : Output Power versus Input Level Figure 11 : Power Dissipation versus OutputPowerFigure 8 : Output Power versus Supply VoltageFigure 9 : Total Harmonic Distortion versusOutput PowerTDA2030A5/15Figure 12 : Single Supply High Power Amplifier (TDA2030A+ BD907/BD908)Figure 13 : P.C. Board and Component Layout for the Circuit of Figure 12 (1:1 scale)TDA2030A6/15TYPICAL PERFORMANCE OF THE CIRCUIT OF FIGURE 12Symbol Parameter Test Conditions Min. Typ. Max. UnitVsSupply Voltage 36 44 VIdQuiescent Drain Current Vs= 36V 50 mAPoOutput Powerd = 0.5%, RL=4Ω, f = 40 z to 15HzVs= 39VVs= 36Vd = 10%, RL=4Ω, f = 1kHzVs= 39VVs= 36V35284435WWWWGvVoltage Gain f = 1kHz 19.5 20 20.5 dBSR Slew Rate 8V/µsecd Total Harmonic Distortion f = 1kHzPo= 20W f = 40Hz to 15kHz0.020.05%%ViInput SensitivityGv= 20dB, f = 1kHz, Po= 20W, RL=4Ω 890 mVS/N Signal to Noise RatioRL=4Ω,Rg= 10kΩ, B = Curve APo= 25WPo=4W108100dBFigure 14 : Typical Amplifier with Spilt Power SupplyFigure 15 : P.C. Board and Component Layout for the Circuit of Figure 14 (1:1 scale)TDA2030A7/15Figure 16 : Bridge Amplifier with Split Power Supply (PO= 34W, VS= ± 16V)Figure 17 : P.C. Board and ComponentLayout for the Circuit of Figure 16 (1:1 scale)MULTIWAY SPEAKER SYSTEMS AND ACTIVEBOXESMultiway loudspeaker systems provide the bestpossible acoustic performance since each loud-speaker is specially designed and optimized tohandle a limited range of frequencies.Commonly,these loudspeaker systems divide the audio spec-trum into two or three bands.To maintain aflat frequencyresponseover the Hi-Fiaudio range the bands covered by each loud-speaker must overlap slightly. Imbalance betweenthe loudspeakers produces unacceptable resultstherefore it is important to ensure that each unitgenerates the correct amount of acoustic energyfor its segmento of the audio spectrum. In thisrespect it is also important to know the energydistribution of the music spectrumto determine thecutoff frequenciesof the crossover filters (see Fig-ure 18). As an example a 100W three-way systemwith crossover frequencies of 400Hz and 3kHzwould require 50W for the woofer, 35W for themidrange unit and 15W for thetweeter.TDA2030A8/15Figure 18 : Power Distribution versus FrequencyBoth active and passive filters can be used forcrossovers but today active filters cost significantlyless than a good passive filter using air coredinductors and non-electrolytic capacitors. In addi-tion, active filters do not suffer from the typicaldefects of passive filters:- power less- increased impedance seen by the loudspeaker(lower damping)- difficulty of precise design due to variable loud-speaker impedance.Obviously, active crossovers can only be used if apower amplifier is provided for eachdrive unit. Thismakes it particularly interesting and economicallysound to use monolithic power amplifiers.In someapplications, complex filters are not reallynecessary and simple RC low-pass and high-passnetworks (6dB/octave)can be recommended.The result obtained are excellent because this isthe best type of audio filter and the only one freefrom phase and transientdistortion.The rather poor out of band attenuation of singleRC filters means that the loudspeaker must oper-ate linearly well beyondthe crossover frequency toavoid distortion.Figure 19 : Active Power FilterA more effective solution, named ”Active PowerFilter” by SGS-THOMSON is shown in Figure 19.The proposed circuit can realize combined poweramplifiers and 12dB/octave or 18dB/octave high-pass or low-pass filters.In practice, at the input pins of the amplifier twoequal and in-phase voltages are available, as re-quired for the active filter operation.The impedanceat thepin(-) is of theorder of 100Ω,while that of the pin (+) is very high, which is alsowhat was wanted.The component values calculated for fc= 900Hzusing a Bessek 3rd order Sallen and Key structureare :C1=C2=C3R1R2R322nF8.2kΩ 5.6kΩ 33kΩUsingthis typeof crossoverfilter, a complete 3-way60W active loudspeaker system is shown in Fig-ure 20.It employs 2nd order Buttherworth filters with thecrossover frequenciesequal to 300Hz and 3kHz.The midrange section consists of two filters, a highpass circuit followed by a low pass network. WithVS= 36V the output power delivered to the wooferis 25W at d = 0.06% (30W at d = 0.5%).The power delivered to the midrange and thetweeter can be optimized in the design phasetaking in account the loudspeaker efficiency andimpedance (RL=4Ωto 8Ω).It is quite common that midrange and tweeterspeakers have an efficiency 3dB higher than-woofers.TDA2030A9/15Figure 20 : 3 Way 60W Active LoudspeakerSystem (VS= 36V)TDA2030A10/15 . 6 .8 0.260 0.2 68 0.276H2 10.4 0.409H3 10.05 10.4 0.396 0.409L 17 .85 0.703L1 15.75 0.620L2 21.4 0 .84 3L3 22.5 0 .88 6L5 2.6 3 0.102 0.1 18 L6 15.1 15 .8. Io=1A+ 20% 28. 8V 43.2V 42V 37.5V+ 15% 27.6V 41.4V 40.3V 35.8V+ 10% 26.4V 39.6V 38. 5V 34.2V– 24V 36.2V 35V 31V– 10% 21.6V 32.4V 31.5V 27.8V– 15% 20.4V
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