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TDA7491HV Datasheet(PDF) 37 Page - STMicroelectronics

Part # TDA7491HV
Description  20 W 20 W dual BTL class-D audio amplifier
PDF  50 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7491HV Datasheet(HTML) 37 Page - STMicroelectronics

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Figure 55. Unipolar PWM output
8.6
Reconstruction low-pass filter
Standard applications use a low-pass filter before the speaker. The cut-off frequency should be higher 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 figures below.
Figure 56. Typical LC filter for an 8 Ω speaker
TDA7491HV
Reconstruction low-pass filter
DS5624 - Rev 10
page 37/50



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