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TS4984FC Datasheet(PDF) 20 Page - STMicroelectronics

Part # TS4984FC
Description  1.2W Stereo Audio Power Amplifier with Active Low Standby Mode
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4984FC Datasheet(HTML) 20 Page - STMicroelectronics

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Application Information
TS4984FC
20/30
The following graph (
Figure 63) shows an example of C
in and Cfeed influence.
4.4
Power dissipation and efficiency
Hypotheses:
●
Voltage and current in the load are sinusoidal (Vout and Iout).
●
Supply voltage is a pure DC source (VCC).
Regarding the load we have:
and
and
Therefore, the average current delivered by the supply voltage is:
The power delivered by the supply voltage is:
Then, the power dissipated by each amplifier is:
Figure 63. Frequency response gain versus Cin & Cfeed
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
ou t = VPEAK sinωt
(V)
I
ou t =
V
out
R
L
-------------
(A)
P
ou t =
V
PEAK
2
2R
L
-----------------------
(W)
I
CC
AVG
= 2
V
PEAK
πR
L
-----------------
(A)
P
supp ly
V
CC
I
CC
AV G
⋅
=
W
()
P
diss
P
su pp ly
P
ou t
–
=
W
()
P
diss
22V
CC
π R
L
----------------------
P
out
P
out
–
⋅
=
W
()



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