TDA7491HV 데이터 시트보기 (PDF) - STMicroelectronics

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TDA7491HV

20 W + 20 W dual BTL class-D audio amplifier

STMicroelectronics 

Application information

TDA7491HV

7.6

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-C component values depending on the loud

speaker impedance. Some typical values, which give a cut-off frequency of 27 kHz, are

shown in Figure 28 and Figure 29 below.

Figure 28. Typical LC filter for a 8-Ω speaker

Figure 29. Typical LC filter for a 4-Ω speaker

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