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參數資料
| 型號： | TS4974IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, DSO10 |
| 封裝： | 3 X 3 MM, 0.50 MM PITCH, ROHS COMPLIANT, DFN-10 |
| 文件頁數： | 9/25頁 |
| 文件大小： | 319K |
| 代理商： | TS4974IQT |
TS4974
Application information
17/25
4.3
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 1
The power delivered by the supply voltage is:
Psupply = VCC ICC AVG (W)
Therefore, the power dissipated by each amplifier is:
Pdiss = Psupply - Pout (W)
Equation 2
V
out = Vpeak sinωt (V)
I
out =
V
out
R
L
------------- (A)
P
out =
V
peak
2
2R
L
--------------------- (W)
I
CC
AVG = 2
V
peak
πR
L
----------------- (A)
P
diss
22V
CC
π R
L
---------------------- P
out Pout
–
=
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