- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄365910 > TPA321DR Single Audio Amplifier PDF資料下載
參數(shù)資料
| 型號： | TPA321DR |
| 元件分類： | 音頻放大器 |
| 英文描述： | Single Audio Amplifier |
| 中文描述： | 單音頻放大器 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 424K |
| 代理商： | TPA321DR |
TPA321
350-mW MONO AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS
SLOS312A – JUNE 2000 – REVISED JUNE 2000
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
Although the voltages and currents for SE and BTL are sinusoidal in the load, currents from the supply are very
different between SE and BTL configurations. In an SE application the current waveform is a half-wave rectified
shape whereas in BTL it is a full-wave rectified waveform. This means RMS conversion factors are different.
Keep in mind that for most of the waveform both the push and pull transistors are not on at the same time, which
supports the fact that each amplifier in the BTL device only draws current from the supply for half the waveform.
The following equations are the basis for calculating amplifier efficiency.
I
DD
rms
2V
P
R
L
P
SUP
VDDI
DD
rms
V
DD
2V
P
R
L
Efficiency
PL
PSUP
Efficiency of a BTL Configuration
V
P
2V
DD
P
L
R
L
2
1 2
2V
DD
(3)
Where:
(4)
PL
VLrms2
RL
V
P
2
Vp
2RL
2
V
L
rms
Table 1 employs equation 4 to calculate efficiencies for three different output power levels. The efficiency of the
amplifier is quite low for lower power levels and rises sharply as power to the load is increased resulting in a
nearly flat internal power dissipation over the normal operating range. The internal dissipation at full output
power is less than in the half power range. Calculating the efficiency for a specific system is the key to proper
power supply design.
Table 1. Efficiency vs Output Power in 3.3-V 8-
BTL Systems
OUTPUT POWER
(W)
EFFICIENCY
(%)
PEAK-to-PEAK
VOLTAGE
(V)
INTERNAL
DISSIPATION
(W)
0.125
33.6
1.41
0.26
0.25
47.6
2.00
2.45
0.29
0.375
58.3
0.28
High-peak voltage values cause the THD to increase.
A final point to remember about linear amplifiers (either SE or BTL) is how to manipulate the terms in the
efficiency equation to utmost advantage when possible. Note that in equation 4, V
DD
is in the denominator. This
indicates that as V
DD
goes down, efficiency goes up.
Powered by ICminer.com Electronic-Library Service CopyRight 2003
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPA6011A4PWPR | Slide |
| TPA6017A2PWPR | AUDIO AMPLIFIER|DUAL|CMOS|TSSOP|20PIN|PLASTIC |
| TPA6030A4 | 3-W Stereo Audio Power Amplifier with Advanced DC Volume Control |
| TPA6030A4PWP | Slide |
| TPA6100A2 | 50-mW Ultra-Low Voltage Audio Power Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA321DRG4 | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 產(chǎn)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 |
| TPA321EVM | 功能描述:音頻 IC 開發(fā)工具 TPA321 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA3221DDV | 功能描述:HIGH POWER AMPLIFIER 制造商:texas instruments 系列:- 包裝:管件 零件狀態(tài):在售 類型:D 類 電壓 - 電源:7 V ~ 32 V 安裝類型:表面貼裝 工作溫度:0°C ~ 70°C 供應(yīng)商器件封裝:44-HTSSOP 封裝/外殼:44-TSSOP（0.240"，6.10mm 寬）裸露焊盤 標準包裝:35 |
| TPA3244DDWR | 功能描述:IC AMP AUDIO CLASS D 44-HTSSOP 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:D 類 輸出類型:2 通道（立體聲） 不同負載時的最大輸出功率 x 通道數(shù):60W x 2 @ 8 歐姆 電壓 - 電源:12 V ~ 31.5 V 特性:消除爆音，短路保護 安裝類型:表面貼裝 工作溫度:最高 750.2°F（399°C） 供應(yīng)商器件封裝:44-HTSSOP 封裝/外殼:44-TSSOP（0.240"，6.10mm 寬）裸露焊盤 標準包裝:1 |
| TPA3244EVM | 功能描述:EVAL BOARD FOR TPA3244 制造商:texas instruments 系列:PurePath? 零件狀態(tài):在售 放大器類型:D 類 輸出類型:2 通道（立體聲） 不同負載時的最大輸出功率 x 通道數(shù):100W x 2 @ 4 歐姆 電壓 - 電源:14 V ~ 31.5 V 板類型:完全填充 使用的 IC/零件:TPA3244 所含物品:板 標準包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。