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參數資料
| 型號： | TS4984EKIJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA15 |
| 封裝： | LEAD FREE, FCP-15 |
| 文件頁數： | 13/29頁 |
| 文件大小： | 1751K |
| 代理商： | TS4984EKIJT |
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Application Information
TS4984FC
20/29
4.4
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
Therefore, the average current delivered by the supply voltage is:
The power delivered by the supply voltage is:
Then, the power dissipated by each amplifier is:
and the maximum value is obtained when:
and its value is:
Note:
This maximum value is only depending on power supply voltage and load values.
The efficiency,
η, is the ratio between the output power and the power supply:
The maximum theoretical value is reached when
VPEAK = VCC, so that:
V
out
= V
PEAK
sin
ωt
(V)
I
out =
V
out
R
L
-------------
(A)
P
out =
V
PEA K
2
2R
L
-------------------------
(W)
I
CC
AV G
= 2
V
PEAK
πR
L
-------------------
(A)
P
s upply
V
CC
I
CC
AVG
=
W
()
P
diss
P
supply
P
out
–
=
W
()
P
diss
22V
CC
π R
L
-----------------------
P
out
P
out
–
=
W
()
P
dis s
P
out
--------------------- = 0
P
dissmax
2V
cc
2
π2R
L
-------------
=
W
()
η =
P
out
P
supply
-------------------- =
πV
PEAK
4V
CC
-------------------------
π
4
----- = 78.5%
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TS4984FC | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984IQT | 功能描述:音頻放大器 2x1W stereo audio Pwr amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4985 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4985EIJT | 功能描述:音頻放大器 2x1.2W stereo audio RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4985EIKJT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
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