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TDA2030AV データシート(PDF) 9 Page - STMicroelectronics |
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TDA2030AV データシート(HTML) 9 Page - STMicroelectronics |
9 / 15 page Figure 18 : Power Distribution versus Frequency 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-electrolytic capacitors. In addi- tion, active filters do not suffer from the typical defects 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 a 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 result 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 oper- ate linearly well beyond the crossover frequency to avoid distortion. Figure 19 : Active Power Filter A more effective solution, named ”Active Power Filter” by SGS-THOMSON is shown in Figure 19. The proposed circuit can realize combined power amplifiers and 12dB/octave or 18dB/octave high- pass or low-pass filters. In practice, at the input pins of the amplifier two equal 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 Ω, while that of the pin (+) is very high, which is also what was wanted. The component values calculated for fc = 900Hz using a Bessek 3rd order Sallen and Key structure are : C1 =C2 =C3 R1 R2 R3 22nF 8.2k Ω 5.6k Ω 33k Ω Using this type of crossover filter, a complete 3-way 60W active loudspeaker system is shown in Fig- ure 20. It employs 2nd order Buttherworth filters with the crossover frequencies equal to 300Hz and 3kHz. The midrange section consists of two filters, a high pass circuit followed by a low pass network. With VS = 36V the output power delivered to the woofer is 25W at d = 0.06% (30W at d = 0.5%). The power delivered to the midrange and the tweeter can be optimized in the design phase taking in account the loudspeaker efficiency and impedance (RL =4 Ω to 8Ω). It is quite common that midrange and tweeter speakers have an efficiency 3dB higher than- woofers. TDA2030A 9/15 |
同様の部品番号 - TDA2030AV |
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同様の説明 - TDA2030AV |
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