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LM4940 bảng dữ liệu(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
tên linh kiện LM4940
Giải thích chi tiết về linh kiện  6W Streo Audio Power Amplifier
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nhà sản xuất  NSC [National Semiconductor (TI)]
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LM4940 bảng dữ liệu(HTML) 4 Page - National Semiconductor (TI)

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Typical Application
External Components Description Refer to (Figure 1.)
Components
Functional Description
1.
R
IN
This is the inverting input resistance that, along with R
F, sets the closed-loop gain. Input
resistance R
IN and input capacitance CIN form a high pass filter. The filter’s cutoff frequency is fC
=1/(2
πR
INCIN).
2.
C
IN
This is the input coupling capacitor. It blocks DC voltage at the amplifier’s inverting input. C
IN and
R
IN create a highpass filter. The filter’s cutoff frequency is fC =1/(2
πR
INCIN). Refer to the
SELECTING EXTERNAL COMPONENTS section for an explanation of determining C
IN’s value.
3.
R
F
This is the feedback resistance that, along with R
i, sets closed-loop gain.
4.
C
S
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information
about properly placing, and selecting the value of, this capacitor.
5.
C
BYPASS
This capacitor filters the half-supply voltage present on the BYPASS pin. Refer to the Application
section, SELECTING EXTERNAL COMPONENTS, for information about properly placing, and
selecting the value of, this capacitor.
6.
C
OUT
This is the output coupling capacitor. It blocks the nominal V
DD/2 voltage present at the output
and prevents it from reaching the load. C
OUT and RL form a high pass filter whose cutoff
frequency is f
C =1/(2
πR
LCOUT). Refer to the SELECTING EXTERNAL COMPONENTS section
for an explanation of determining C
OUT’s value.
20075672
FIGURE 2. Typical Stereo Audio Amplifier Application Circuit
www.national.com
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