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TS4990 Datasheet(PDF) 19 Page - STMicroelectronics

Part # TS4990
Description  1.2 W audio power amplifier with active-low standby mode
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4990 Datasheet(HTML) 19 Page - STMicroelectronics

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DocID9309 Rev 14
19/33
TS4990
Application information
33
The graph in Figure 60 shows an example of Cin and Cfeed influence.
Figure 60. Frequency response gain vs. Cin and Cfeed
4.4
Power dissipation and efficiency
Hypotheses:
Load voltage and current are sinusoidal (Vout and Iout).
Supply voltage is a pure DC source (VCC).
The load can be expressed as:
and
and
Therefore, the average current delivered by the supply voltage is:
The power delivered by the supply voltage is:
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)
V
out = VPEAK sin t
(V)
I
out =
V
out
R
L
-------------
(A)
P
out =
V
PEAK
2
2R
L
-------------------------
(W)
I
CC
AVG
=
2
V
PEAK
R
L
----------------------
(A)
P
supply
V
CC
I
CC
AVG
(W)
=



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