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TS4990 Datenblatt(PDF) 19 Page - STMicroelectronics

Teilenummer TS4990
Bauteilbeschribung  1.2 W audio power amplifier with active low standby mode
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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TS4990 Datenblatt(HTML) 19 Page - STMicroelectronics

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TS4990
Application information
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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 ωt
(V)
I
out =
V
out
R
L
-------------
(A)
P
out =
V
PEAK
2
2R
L
-------------------------
(W)
I
CC
AVG
=
2
V
PEAK
πR
L
----------------------
(A)
P
supply
V
CC
I
CC
AVG
(W)
⋅
=


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