TDA2040 20W Hi-Fi AUDIO POWER AMPLIFIER DESCRIPTION The TDA2040 is a monolithic integrated circuit in Pentawatt package,intended for use as an audio class AB amplifier. Typically it provides 22W output power (d = 0.5%) at Vs = 32V/4Ω . The TDA2040 provides high output current and has very low harmonic and cross-over distortion. Further the device incorporates a patented short circuit protection system comprising an arrangement for automatically limiting the dissipated power so as to keep the working point of the output transistors within their safe operating area. A thermal shut-down system is also included. PENTAWATT ORDERING NUMBER : TDA2040V TEST CIRCUIT December 1995 1/13 TDA2040 SCHEMATIC DIAGRAM PIN CONNECTION THERMAL DATA Symbol Rth j-case 2/13 Parameter Thermal Resistance Junction-case Max. Value Unit 3 °C/W TDA2040 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Vs Supply Voltage Vi Input Voltage Vi Differential Input Voltage Io Output Peak Current (internally limited) Value Unit ± 20 V Vs ± 15 V 4 A Ptot Power Dissipation at T case = 75 °C 25 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 Vs Supply Voltage Id Quiescent Drain Current Test Conditions Min. Typ. ± 2.5 Vs = ± 4.5V Vs = ± 20V 45 Max. Unit ± 20 V 30 100 mA mA Input Bias Current Vs = ± 20V 0.3 1 µA Vos Input Offset Voltage Vs = ± 20V ±2 ± 20 mV Ios Input Offset Current Po Output Power Ib ± 200 d = 0.5%, Tcase = 60°C f = 1kHz RL = 4Ω RL = 8Ω f = 15kHz RL = 4Ω nA W 20 15 22 12 18 BW Power Bandwidth Po = 1W, RL = 4Ω 100 kHz Gv Open Loop Voltage Gain f = 1kHz 80 dB Gv Closed Loop Voltage Gain f = 1kHz d Total Harmonic Distortion Po = 0.1 to 10W, R L = 4Ω f = 40 to 15000Hz f = 1kHz eN iN Input Noise Voltage Input Noise Current 29.5 30 30.5 % 0.08 0.03 B = Curve A B = 22Hz to 22kHz 2 3 10 B = Curve A B = 22Hz to 22kHz 50 80 200 Ri Input Resistance (pin 1) SVR Supply Voltage Rejection R L = 4Ω, R g = 22kΩ, Gv = 30dB f = 100Hz, Vripple = 0.5VRMS η Efficiency f = 1kHz Po = 12W Po = 22W Tj Thermal Shut-down Junction Temperature RL = 8 Ω RL = 4 Ω dB µV µV pA 0.5 5 MΩ 40 50 dB % 66 63 145 °C 3/13 TDA2040 Figure 1 : Output Power versus Supply Voltage Figure 2 : Output Power versus Supply Voltage Figure 3 : Output Power versus Supply Voltage Figure 4 : Distortion versus Frequency Figure 5 : Supply Voltage Rejection versus Frequency Figure 6 : Supply Voltage Rejection versus Voltage Gain 4/13 TDA2040 Figure 7 : Quiescent Drain Current versus Supply Voltage Figure 9 : Power Dissipation versus Output Power Figure 8 : Open Loop Gain versus Frequency 5/13 TDA2040 Figure 10 : Amplifier with Split Power Supply Figure 11 : P.C. Board and Components Layout for the Circuit of Figure 10 (1:1 scale) 6/13 TDA2040 Figure 12 : Amplifier with Split Power Supply (see Note) Note : In this case of highly inductive loads protection diodes may be necessary. Figure 13 : P.C. Board and Components Layout for the Circuit of Figure 12 (1:1 scale) 7/13 TDA2040 Figure 14 : 30W Bridge Amplifier with Split Power Supply Figure 15 : P.C. Board and Components Layout for the Circuit of Figure 14 (1:1 scale) 8/13 TDA2040 Figure 16 : Two Way Hi-Fi System with Active Crossover Figure 17 : P.C. Board and Components Layout for the Circuit of Figure 16 (1:1 scale) 9/13 TDA2040 Figure 18 : Frequency Response Figure 19 : Power Distribution versus Frequency MULTIWAY SPEAKER SYSTEMS AND ACTIVE BOXES power amplifier is provided for each drive unit. This makes it particularly interesting and economically sound to use monolithic power amplifiers. In some applications, complex filters are not really necessary and simple RC low-pass and high-pass networks (6dB/octave) can be recommended. The results obtained are excellent because this is the best type of audio filter and the only one free from phase and transient distortion. The rather poor out of band attenuation of single RC filters means that the loudspeaker must operate linearly well beyond the crossover frequency to avoid distortion. A more effective solution, named ”Active Power Filter” by SGS is shown in Figure 20. Multiway loudspeaker systems provide the best possible acoustic performance since each loudspeaker is specially designed and optimized to handle a limited range of frequencies. Commonly, these loudspeaker systems divide the audio spectrum into two, three or four bands. To maintain a flat frequencyresponseover the Hi-Fi audio range the bands covered by each loudspeaker must overlap slightly. Imbalance between the loudspeakers produces unacceptable results therefore it is important to ensure that each unit generates the correct amount of acoustic energy for its segment of the audio spectrum. In this respect it is also important to know the energy distribution of the music spectrum determine the cutoff frequenciesof the crossover filters (see Figure 19). As an example, a 100W three-way system with crossover frequencies of 400Hz and 3kHz would require 50W for the woofer, 35W for the midrange unit and 15W for the tweeter. Both active and passive filters can be used for crossovers but today active filters cost significantly less than a good passive filter using air-cored inductors and non-electrolyticcapacitors. In addition, active filters do not suffer from the typical defects of passive filters : - power loss - increased impedance seen by the loudspeaker (lower damping) - difficulty of precise design due to variable loudspeaker impedance Obviously, active crossovers can only be used if a 10/13 Figure 20 : Active Power Filter The proposed circuit can realize combined power amplifiers and 12dB/octave or 18dB/octave highpass or low-pass filters. In practice, at the input pins of the amplifier two equal and in-phase voltages are available, as required for the active filter operation. TDA2040 The impedance at the pin (-) is of the order of 100Ω, while that of the pin (+) is very high, which is also what was wanted. C1 = C2 = C3 22 nF R1 8.2 kΩ R2 5.6 kΩ R3 33 kΩ The component values calculated for fc = 900Hz using a Bessel 3rd order Sallen and Key structure are : In the block diagram of Figure 21 is represented an active loudspeaker system completely realized using power integrated circuit, rather than the traditional discrete transistors on hybrids, very high quality is obtained by driving the audio spectrum into three bands using active cro ssove rs (TDA2320A) and a separate amplifier and loudspeakers for each band. A modern subwoofer/midrange/tweetersolution is used. PRATICAL CONSIDERATION Printed Circuit Board The layout shown in Figure 11 should be adopted by the designers. If different layouts are used, the ground points of input 1 and input 2 must be well decoupled from the gorund return of the output in which a high current flows. Assembly Suggestion No electrical isolation is needed between the package and the heatsink with single supply voltage configuration. Application Suggestions The recommended values of the components are those shown on application circuit of Fig. 10. Different values can be used. The following table can help the designer. Figure 21 : High Power Active Loudspeaker System using TDA2030A and TDA2040 R1 R2 R3 R4 Recom. Value 22kΩ 680Ω 22kΩ 4.7Ω C1 C2 C3, C4 C5, C6 C7 1µF 22µF 0.1µF 220µF 0.1µF Comp. Purpose Non inverting input biasing Closed loop gain setting Closed loop gain setting Frequency stability Input DC decoupling Inverting DC decoupling Supply voltage bypass Supply voltage bypass Frequency stability Larger than Recommended Value Increase of input impedance Decrease of gain (*) Increase of gain Danger of oscillation at high frequencies with inductive loads Smaller than Recommended Value Decrease of input impedance Increase of gain Decrease of gain (*) Increase of low frequencies cut-off Increase of low frequencies cut-off Danger of oscillation Danger of oscillation Danger of oscillation (*) The value of closed loop gain must be higher than 24dB 11/13 TDA2040 PENTAWATT PACKAGE MECHANICAL DATA DIM. mm TYP. MIN. A C D D1 E F F1 G G1 H2 H3 L L1 L2 L3 L5 L6 L7 M M1 Dia MAX. 4.8 1.37 2.8 1.35 0.55 1.05 1.4 2.4 1.2 0.35 0.8 1 3.4 6.8 10.4 10.4 10.05 MIN. inch TYP. 0.094 0.047 0.014 0.031 0.039 0.126 0.260 0.134 0.268 MAX. 0.189 0.054 0.110 0.053 0.022 0.041 0.055 0.142 0.276 0.409 0.409 0.396 17.85 15.75 21.4 22.5 0.703 0.620 0.843 0.886 2.6 15.1 6 3 15.8 6.6 0.102 0.594 0.236 0.118 0.622 0.260 4.5 4 0.177 0.157 3.65 3.85 0.144 0.152 E L D1 C D M A M1 L1 L2 L5 L7 L6 12/13 F H2 F1 Dia. G1 G H3 L3 TDA2040 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. 1996 SGS-THOMSON Microelectronics All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 13/13