Applications

TDA2040

12/16

Doc ID 1460 Rev 6

Figure 23.

Active power filter

A more effective solution, named "Active Power Filter" by STMicroelectronics, is shown in

Figure 23. The proposed circuit can be realized by combined power amplifiers and

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

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

structure are:

C1 = C2 = C3 = 22 nF

R1 = 8.2 k

Ω

R2 = 5.6 k

Ω

R3 = 33 k

Ω

In the block diagram of Figure 24 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 crossovers (TDA2320A) and a separate amplifier and loudspeakers for each band. A

modern subwoofer/midrange/tweeter solution is used.

Figure 24.

High-power active loudspeaker system using TDA2030A and TDA2040

Obsolete

Product(s)

- Obsolete

Product(s)