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TS488IST 数据表(PDF) 22 Page - STMicroelectronics

部件名 TS488IST
功能描述  Pop-free 120mW stereo headphone amplifier
PDF  32 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS488IST 数据表(HTML) 22 Page - STMicroelectronics

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Application information
TS488-TS489
22/32
4
Application information
4.1
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
The average current delivered by the power supply voltage is:
Figure 78.
Current delivered by power supply voltage in single-ended configuration
The power delivered by power supply voltage is:
So, the power dissipation by each power amplifier is
and the maximum value is obtained when:
V
OUT
V
PEAK
ωtV
()
sin
=
I
OUT
V
OUT
R
L
-------------- A
()
=
P
OUT
V
PEAK
2
2R
L
----------------- A
()
=
I
CC
AVG
1
2
π
------
V
PEAK
R
L
-----------------
t
()
sin
t
d
0
π
∫
V
PEAK
πR
L
----------------- A
()
==
Icc (t)
Time
T/2
T
Icc
AVG
Vpeak/R
L
03T/2
2T
P
supply
V
CCICC
AVG
W
()
=
P
diss
P
supply POUT W
()
–
=
P
diss
2VCC
π R
L
------------------- P
OUT
P
OUT W
()
–
=
P
OUT
∂
∂P
diss
0
=



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