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AN3959 датащи(PDF) 30 Page - STMicroelectronics

номер детали AN3959
подробное описание детали  The purpose of this application note is to describe
PDF  65 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3959 датащи(HTML) 30 Page - STMicroelectronics

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Design guidelines for schematic and PCB layout
AN3959
30/65
Doc ID 022081 Rev 3
6.1.5
Main filter
The main filter is an L and C based Butterworth filter. The cutoff frequency must be chosen
between the upper limit of the audio band (
≈20 kHz) and the carrier frequency (384 kHz).
Figure 30.
Main filter
6.1.6
Dumping network
The C-R-C is a dumping network. It is mainly intended for high inductive loads such as
disconnecting the speaker load.
Figure 31.
Dumping network
C dump-S
C dump-P
C dump-P
C dump-S
R dump
Rdump
Table 7.
Recommended values
Rload
16 ohm
12 ohm
8 ohm
6 ohm
4 ohm
Lload
47 µH
33 µH
22 µH
15 µH
10 µH
Cload
220 nF
330 nF
470 nF
680 nF
1 µF
C dump-S
100 nF
100 nF
100 nF
100 nF
220 nF
C dump-P
100 nF
100 nF
100 nF
100 nF
220 nF
R dump
10
8.2
6.2
4.7
2.7



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