參數(shù)資料
型號(hào): TS4998IQT
廠商: STMICROELECTRONICS
元件分類: 音頻/視頻放大
英文描述: 1 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16
封裝: 4 X 4 MM, ROHS COMPLIANT, QFN-16
文件頁(yè)數(shù): 16/33頁(yè)
文件大?。?/td> 488K
代理商: TS4998IQT
TS4998
Application information
23/33
4.6
Power dissipation and efficiency
Assumptions:
Load voltage and current are sinusoidal (Vout and Iout)
Supply voltage is a pure DC source (VCC)
The output voltage is:
and
Therefore, the average current delivered by the supply voltage is:
Equation 3
The power delivered by the supply voltage is:
Equation 4
Psupply = VCC IccAVG (W)
Therefore, the power dissipated by each amplifier is:
Pdiss = Psupply - Pout (W)
and the maximum value is obtained when:
and its value is:
Equation 5
Note:
This maximum value is only dependent on the power supply voltage and load values.
V
out = Vpeak sinωt (V)
I
out =
V
out
R
L
------------- (A)
P
out =
V
peak
2
2R
L
--------------------- (W)
I
ccAVG = 2
V
peak
πR
L
----------------- (A)
P
diss
22V
CC
π R
L
---------------------- P
out Pout W
()
=
Pdiss
P
out
--------------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
π
=
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