TDA7498MV Datasheet, PDF (22/27 Pages) STMicroelectronics – 100-watt mono BTL class-D audio amplifier

Applications information
TDA7498MV
5.6
Output low-pass filter
To avoid EMI problems, it may be necessary to use a low-pass filter before the speaker. The
cut-off frequency should be larger than 22 kHz and much lower than the output switching
frequency. It is necessary to choose the L and C component values depending on the
loudspeaker impedance. Some typical values, which give a cut-off frequency of 27 kHz, are
shown in Figure 23 and Figure 24 below.
Figure 23. Typical LC filter for a 8-Ω speaker
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Figure 24. Typical LC filter for a 6-Ω speaker
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Doc ID 16505 Rev 3