TDA7492P Datasheet, PDF (21/26 Pages) STMicroelectronics – 25-watt + 25-watt dual BTL class-D audio amplifier

TDA7492P
Applications information
6.5
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-C component values depending on the loud
speaker impedance. Some typical values, which give a cutoff frequency of 27 kHz, are
shown in Figure 25 and Figure 26 below.
Figure 25. Typical LC filter for a 8-Ω speaker
Figure 26. Typical LC filter for a 4-Ω speaker
Doc ID 15068 Rev 5
21/26