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TS4956 数据表(PDF) 37 Page - STMicroelectronics

部件名 TS4956
功能描述  Stereo audio amplifier system with I2C bus interface
PDF  51 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS4956 数据表(HTML) 37 Page - STMicroelectronics

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TS4956
Application information
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4.3
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
4.3.1
Single-ended output configuration (modes 5 and 6)
The average current delivered by the supply voltage is:
Figure 126. Current delivered by supply voltage in the single-ended output configuration
The power delivered by supply voltage is:
So, the power dissipation by single-ended amplifier is
and the maximum value is obtained when:
V
out
V
PEAK
ωtV
()
sin
=
I
out
V
ou t
R
L
-----------A
()
=
P
ou t
V
PEAK
2
2R
L
----------------- A
()
=
Icc
AVG
1
2
π
------
V
PEAK
R
L
-----------------
t
()
sin
t
d
0
π
∫
V
PEAK
πR
L
----------------- A
()
==
P
sup ply
V
CCICC
AV G
W
()
=
P
diss
P
su pp ly Pou t W
()
–
=
P
diss
2VCC
π R
L
-------------------P
out
P
out W
()
–
=
P
out
∂
∂P
diss
0
=



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