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TS4984 Datasheet(PDF) 19 Page - STMicroelectronics

No. de pieza TS4984
Descripción Electrónicos  2 x 1W Stereo audio power amplifier with active low standby mode
PDF  29 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4984 Datasheet(HTML) 19 Page - STMicroelectronics

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Application Information
TS4984
19/29
4.2 Gain in typical application schematic
The typical application schematic (Figure 64) is shown on page 18.
In the flat region (no Cin effect), the output voltage of the first stage is:
For the second stage: Vout2 =-Vout1 (V)
The differential output voltage is:
The differential gain, referred to as Gv for greater convenience, is:
Vout2 is in phase with Vin and Vout1 is phased 180° with Vin. This means that the positive terminal of the
loudspeaker should be connected to Vout2 and the negative to Vout1.
4.3 Low and high frequency response
In the low frequency region, Cin starts to have an effect. Cin forms with Rin a high-pass filter with a -3dB
cut-off frequency:
In the high frequency region, you can limit the bandwidth by adding a capacitor (Cfeed) in parallel with
Rfeed. It forms a low-pass filter with a -3dB cut-off frequency. FCH is in Hz.
V
ou t1
V
–
in
()
R
feed
R
in
---------------
(V)
=
V
out2
V
ou t1
–
2V
in
R
feed
R
in
---------------
(V)
=
G
v
V
out2
V
out1
–
V
in
------------------------------------
2
R
feed
R
in
---------------
==
F
CL
1
2
πR
inCin
--------------------------
(Hz)
=
F
CH
1
2
πR
feed Cfeed
----------------------------------------
(Hz)
=



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