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TS4985 Datasheet(PDF) 19 Page - STMicroelectronics

Part # TS4985
Description  2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4985 Datasheet(HTML) 19 Page - STMicroelectronics

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TS4985
Application Information
19/29
4.2
Gain in typical application schematic
The typical application schematic (
Figure 61) 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.
The following graph (
Figure 62) shows an example of C
in and Cfeed influence.
Figure 62. Frequency response gain versus Cin & Cfeed
V
out 1
V
–
in
()
R
feed
R
in
--------------
(V)
=
V
out 2
V
out1
–
2V
in
R
fee d
R
in
--------------
(V)
=
G
v
V
out2
V
out 1
–
V
in
-----------------------------------
2
R
feed
R
in
--------------
==
F
CL
1
2
πR
in
C
in
--------------------------
(Hz)
=
F
CH
1
2
πR
feed
C
fe ed
-------------------------------------
(Hz)
=
10
100
1000
10000
-25
-20
-15
-10
-5
0
5
10
Rin = Rfeed = 22k
Ω
Tamb = 25
°C
Cfeed = 2.2nF
Cfeed = 680pF
Cfeed = 330pF
Cin = 470nF
Cin = 82nF
Cin = 22nF
Frequency (Hz)



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