參數(shù)資料
型號: TS4975EIJT
廠商: STMICROELECTRONICS
元件分類: 音頻控制
英文描述: 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA12
封裝: LEAD FREE, FLIP CHIP, 12 PIN
文件頁數(shù): 19/36頁
文件大?。?/td> 870K
代理商: TS4975EIJT
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
Application Information
TS4975
26/36
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
Single-ended configuration:
The average current delivered by the supply voltage is:
Figure 60. Current delivered by supply voltage in single-ended model
The power delivered by supply voltage is:
So, the power dissipation by each amplifier is
and the maximum value is obtained when:
V
ou t
V
PEAK
ωt V
()
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
AVG
W
()
=
P
diss
P
sup ply Pout
W
()
=
P
diss
2VCC
π R
L
-------------------P
ou t
P
ou t
W
()
=
P
out
P
diss
0
=
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