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參數資料
| 型號： | TS4851EIJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA18 |
| 封裝： | LEAD FREE, FCP-18 |
| 文件頁數： | 14/28頁 |
| 文件大小： | 1280K |
| 代理商： | TS4851EIJT |
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Application Information
TS4851
21/28
and the maximum value is obtained when:
and its value is:
Note: This maximum value is depends only on power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply:
The maximum theoretical value is reached when Vpeak = Vcc, so:
The TS4851 has three independent power amplifiers. Each amplifier produces heat due to its power
dissipation. Therefore, the maximum die temperature is the sum of each amplifier’s maximum power
dissipation. It is calculated as follows:
l Pdiss speaker = Power dissipation due to the speaker power amplifier.
l Pdiss head = Power dissipation due to the Headphone power amplifier
l Total Pdiss = Pdiss speaker + Pdiss head1 + Pdiss head2 (W)
In most cases, Pdiss head1 = Pdiss head2, giving:
Total Pdiss = Pdiss speaker + 2Pdiss head (W)
The following graph (Figure 60) shows an example of the previous formula, with Vcc set to +5V,
Rload speaker set to 8 and Rload headphone set to 16.
Figure 60: Example of total power dissipation vs. speaker and headphone output power
Pdiss
POUT
---------------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
π
=
η =
POUT
Psup pl y
------------------------ = π
VPEAK
4VCC
-----------------------
π
4
----- = 78.5%
[]
)
W
(
P
2
P
R
P
2
R
P
V
2
TotalP
HEAD
OUT
SPEAKER
OUT
HEAD
L
HEAD
OUT
SPEAKER
L
SPEAKER
OUT
CC
diss
+
+
π
=
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TS4851IJT | 功能描述:音頻放大器 Low Power Audio 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 |
| TS4855 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOUDSPEAKER & HEADSET DRIVER WITH VOLUME CONTROL |
| TS4855_04 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOUDSPEAKER & HEADSET DRIVER WITH VOLUME CONTROL |
| TS4855EIJT | 功能描述:音頻放大器 Loudspeaker and headset driver 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 |
| TS4855IJT | 功能描述:音頻放大器 Low Power Audio 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 |
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