TDA2030A

18W Hi-Fi AMPLIFIER AND 35W DRIVER

October 2000

PENTAWATT

ORDERING NUMBERS : TDA2030AH TDA2030AV

DESCRIPTION

The 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 forautomatically limiting 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 APPLICATION

1/15

TEST CIRCUIT

PIN CONNECTION (Top view)

THERMAL DATA

Symbol Parameter Value Unit

Rth (j-case) Thermal Resistance Junction-case Max 3 C/W

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ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

Vs Supply Voltage 22 VVi Input Voltage VsVi Differential Input Voltage 15 VIo Peak Output Current (internally limited) 3.5 A

Ptot Total Power Dissipation at Tcase = 90 C 20 W

Tstg, Tj Storage and Junction Temperature 40 to + 150 C

ELECTRICAL CHARACTERISTICS(Refer to the test circuit, VS = 16V, Tamb = 25oC unless otherwise specified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Vs Supply Voltage 6 22 VId Quiescent Drain Current 50 80 mA

Ib Input Bias Current VS = 22V 0.2 2 AVos Input Offset Voltage VS = 22V 2 20 mV

Ios Input Offset Current 20 200 nAPO Output Power d = 0.5%, Gv = 26dB

f = 40 to 15000HzRL = 4RL = 8

VS = 19V RL = 8

151013

181216

W

BW Power Bandwidth Po = 15W RL = 4 100 kHzSR Slew Rate 8 V/secGv Open Loop Voltage Gain f = 1kHz 80 dB

Gv Closed Loop Voltage Gain f = 1kHz 25.5 26 26.5 dB

d Total Harmonic Distortion Po = 0.1 to 14W RL = 4f = 40 to 15 000Hz f = 1kHzPo = 0.1 to 9W, f = 40 to 15 000Hz

RL = 8

0.080.03

0.5

%%

%

d2 Second Order CCIF IntermodulationDistortion

PO = 4W, f2 f1 = 1kHz, RL = 4 0.03 %

d3 Third Order CCIF IntermodulationDistortion

f1 = 14kHz, f2 = 15kHz2f1 f2 = 13kHz

0.08 %

eN Input Noise Voltage B = Curve AB = 22Hz to 22kHz

23 10

VV

iN Input Noise Current B = Curve AB = 22Hz to 22kHz

5080 200

pApA

S/N Signal to Noise Ratio RL = 4, Rg = 10k, B = Curve APO = 15WPO = 1W

10694

dBdB

Ri Input Resistance (pin 1) (open loop) f = 1kHz 0.5 5 MSVR Supply Voltage Rejection RL = 4, Rg = 22k

Gv = 26dB, f = 100 Hz54 dB

Tj Thermal Shut-down JunctionTemperature

145 C

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Figure 3 : Output Power versus Supply Voltage

Figure 4 : Total Harmonic Distortion versusOutput Power (test using rise filters)

Figure 1 : Single Supply Amplifier

Figure 2 : Open Loop-frequency Response

Figure 5 : Two Tone CCIF IntremodulationDistortion

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Figure 6 : Large Signal Frequency Response Figure 7 : Maximum Allowable Power Dissipationversus Ambient Temperature

Figure 10 : Output Power versus Input Level Figure 11 : Power Dissipation versus OutputPower

Figure 8 : Output Power versus Supply Voltage Figure 9 : Total Harmonic Distortion versusOutput Power

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Figure 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)

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TYPICAL PERFORMANCE OF THE CIRCUIT OF FIGURE 12

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Vs Supply Voltage 36 44 V

Id Quiescent Drain Current Vs = 36V 50 mA

Po Output Power d = 0.5%, RL = 4, f = 40 z to 15HzVs = 39VVs = 36V

d = 10%, RL = 4, f = 1kHzVs = 39VVs = 36V

3528

4435

WW

WW

Gv Voltage Gain f = 1kHz 19.5 20 20.5 dB

SR Slew Rate 8 V/secd Total Harmonic Distortion f = 1kHz

Po = 20W f = 40Hz to 15kHz0.020.05

%%

Vi Input Sensitivity Gv = 20dB, f = 1kHz, Po = 20W, RL = 4 890 mVS/N Signal to Noise Ratio RL = 4, Rg = 10k, B = Curve A

Po = 25WPo = 4W

108100

dB

Figure 14 : Typical Amplifier with Spilt Power Supply

Figure 15 : P.C. Board and Component Layout for the Circuit of Figure 14 (1:1 scale)

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Figure 16 : Bridge Amplifier with Split Power Supply (PO = 34W, VS = 16V)

Figure 17 : P.C. Board and Component Layout for the Circuit of Figure 16 (1:1 scale)

MULTIWAY SPEAKER SYSTEMS AND ACTIVEBOXES

Multiway 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 a flat frequency response over the Hi-Fiaudio range the bands covered by each loud-speaker must overlap slightly. Imbalance betweenthe loudspeakers produces unacceptable results

therefore 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 spectrum to determine thecutoff frequencies of 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 the tweeter.

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Figure 18 : Power Distribution versus Frequency

Both 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 each drive unit. Thismakes it particularly interesting and economicallysound to use monolithic power amplifiers.In some applications, 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 transient distortion.The rather poor out of band attenuation of singleRC filters means that the loudspeaker must operatelinearly well beyond the crossover frequency toavoid distortion.

Figure 19 : Active Power Filter

A 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 impedance at the pin (-) is of the order of 100,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 = C3 R1 R2 R322nF 8.2k 5.6k 33k

Using this type of crossover filter, a complete 3-way60W active loudspeaker system is shown in Fig-ure 20.It employs 2nd order Buttherworth filters with thecrossover frequencies equal 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 = 4 to 8).It is quite common that midrange and tweeterspeakers have an efficiency 3dB higher than-woofers.

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Figure 20 : 3 Way 60W Active Loudspeaker System (VS = 36V)

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MUSICAL INSTRUMENTS AMPLIFIERS

Another important field of application for activesystems is music.In this area the use of several medium poweramplifiers is more convenient than a single highpower amplifier, and it is also more realiable.A typical example (see Figure 21) consist of fouramplifiers each driving a low-cost, 12 inch loud-speaker. This application can supply 80 to160WRMS.

Figure 21 : High Power Active Boxfor Musical Instrument

TRANSIENT INTERMODULATION DISTOR-TION (TIM)

Transient intermodulation distortion is an unfortu-nate phenomen associated with negative-feedbackamplifiers. When a feedback amplifier receives aninput signal which rises very steeply, i.e. containshigh-frequency components, the feedback can ar-rive too late so that the amplifiers overloads and aburst of intermodulation distortion will be producedas in Figure 22. Since transients occur frequentlyin music this obviously a problem for the designerof audio amplifiers. Unfortunately, heavy negativefeedback is frequency used to reduce the totalharmonic distortion of an amplifier, which tends toaggravate the transient intermodulation (TIM situ-ation. The best known method for the measurementof TIM consists of feeding sine waves superim-posed onto square waves, into the amplifier undertest. The output spectrum is then examined usinga spectrum analyser and compared to the input.This method suffers from serious disadvantages :the accuracy is limited, the measurement is a ratherd