TDA749313TR datasheet(16/30 Pages) STMICROELECTRONICS

Part #	TDA749313TR

Description	3-watt 3-watt dual BTL class-D audio amplifier

PDF	30 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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16 / 30 page

Applications information

TDA7493

16/30

Doc ID 14570 Rev 6

5.6

Output low-pass filter

To avoid EMI problems, a low-pass filter can be inserted before the speaker. The cut-off

frequency of the filter should be higher than 22 kHz and much lower than the switching

frequency.

The component values of the filter vary according to the speaker impedance.

A typical LC output filter for a speaker impedance of 8

Ω and with a cut-off frequency of

27 kHz is shown in Figure 9.

Figure 9.

Typical LC filter for 8

Ω speaker

A similar filter for a speaker impedance of 4

Ω and also with a cut-off frequency of 27 kHz is

shown in Figure 10:

Figure 10.

Typical LC filter for 4

Ω speaker

33 µH

Ω

0.47 µF

0.10 µF

330 pF

Ω

33 µH

OUTP

OUTN

0.47 µF

15 µH

OUTP

OUTN

330 pF

Ω

15 µH

0.22 µF

Ω

TDA749313TR Datasheet(PDF) 16 Page - STMicroelectronics