TDA7498 Datasheet, PDF (23/28 Pages) STMicroelectronics – 100-watt + 100-watt dual BTL class-D audio amplifier

TDA7498
Applications information
4.6
Output low-pass filter
To avoid EMI problems, it may be necessary to use a low-pass filter before the speaker. The
cutoff 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
loud-speaker impedance. Some typical values, which give a cutoff frequency of 27 kHz, are
shown in Figure 24 and Figure 25 below.
Figure 24. Typical LC filter for a 8-Ω speaker
Figure 25. Typical LC filter for a 6-Ω speaker
Doc ID 16107 Rev 8
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