參數(shù)資料
型號： TPA321DR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝： GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù)： 6/29頁
文件大?。?/td> 773K
代理商： TPA321DR
www.ti.com
RL
CC
VO(PP)
VDD
-3 dB
fc
BTL AMPLIFIER EFFICIENCY
VL(RMS)
VO
IDD
IDD(RMS)
TPA321
SLOS312C – JUNE 2000 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
Figure 24. Single-Ended Configuration and Frequency Response
Increasing power to the load does carry a penalty of increased internal power dissipation. The increased
dissipation is understandable considering that the BTL configuration produces 4
× the output power of a SE
configuration. Internal dissipation versus output power is discussed further in the thermal considerations section.
Linear amplifiers are inefficient. The primary cause of these inefficiencies is voltage drop across the output stage
transistors. There are two components of the internal voltage drop. One is the headroom or dc voltage drop that
varies inversely to output power. The second component is due to the sine-wave nature of the output. The total
voltage drop can be calculated by subtracting the RMS value of the output voltage from VDD. The internal voltage
drop multiplied by the RMS value of the supply current, IDD(RMS), determines the internal power dissipation of the
amplifier.
An easy-to-use equation to calculate efficiency starts out as being equal to the ratio of power from the power
supply to the power delivered to the load. To accurately calculate the RMS values of power in the load and in the
amplifier, the current and voltage waveform shapes must first be understood (see Figure 25).
Figure 25. Voltage and Current Waveforms for BTL Amplifiers
Although the voltages and currents for SE and BTL are sinusoidal in the load, currents from the supply are
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.
14
相關(guān)PDF資料
PDF描述
TPA321D 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA321DRG4 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA321DG4 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA321DGNRG4 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA321DGNG4 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
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(fēng)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(biāo)準(zhǔn)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(fù)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(hù) 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(biāo)準(zhǔn)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(fù)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(biāo)準(zhǔn)包裝:1
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*