E-TDA2030AV 查看數據表（PDF） - STMicroelectronics

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E-TDA2030AV

18 W hi-fi amplifier and 35 W driver

STMicroelectronics 

TDA2030A

Multiway speaker systems and active boxes

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, "Active Power Filter" by STMicroelectronics is shown in Figure 22.

Figure 22. Active Power Filter

t(s) The proposed circuit can realize combined power amplifiers and 12 dB/octave or

uc 18 dB/octave high-pass or low-pass filters.

d In practice, at the input pins of the amplifier two equal and in-phase voltages are available,

ro as required for the active filter operation.

P 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.

te The component values calculated for fc = 900 Hz using a Bessek 3rd order Sallen and Key

le structure are :

bso C1 = C2 = C3

O 22 nF

R1

8.2 kΩ

R2

5.6 kΩ

R3

33 kΩ

- Using this type of crossover filter, a complete 3-way 60 W active loudspeaker system is

t(s) shown in Figure 23.

c It employs 2nd order Butterworth filters with the crossover frequencies equal to 300 Hz and

u 3 kHz. The midrange section consists of two filters, a high-pass circuit followed by a low-

d pass network. With VS = 36 V the output power delivered to the woofer is 25 W at d = 0.06%

ro (30 W at d = 0.5%).

P The power delivered to the midrange and the tweeter can be optimized in the design phase

tetaking in account the loudspeaker efficiency and impedance (RL = 4 Ω to 8 Ω).

leIt is quite common that midrange and tweeter speakers have an efficiency 3 dB higher than

Obso woofers.

Doc ID 1459 Rev 2

11/23

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