參數(shù)資料
型號(hào)： TPA321DR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 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(yè)數(shù)： 11/29頁(yè)
文件大?。?/td> 773K
代理商： TPA321DR
www.ti.com
USING LOW-ESR CAPACITORS
5-V VERSUS 3.3-V OPERATION
HEADROOM AND THERMAL CONSIDERATIONS
P
dB +
10Log
P
W
P
ref
+ 10Log
350 mW
1 W
+ –4.6 dB
TPA321
SLOS312C – JUNE 2000 – REVISED JUNE 2004
Low-ESR capacitors are recommended throughout this application. A real (as opposed to ideal) capacitor can be
modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the
beneficial effects of the capacitor in the circuit. The lower the equivalent value of this resistance, the more the
real capacitor behaves like an ideal capacitor.
The TPA321 operates over a supply range of 2.5 V to 5.5 V. This data sheet provides full specifications for 5-V
and 3.3-V operation, as these are considered to be the two most common standard voltages. There are no
special considerations for 3.3-V versus 5-V operation with respect to supply bypassing, gain setting, or stability.
The most important consideration is that of output power. Each amplifier in TPA321 can produce a maximum
voltage swing of VDD –1 V. This means, for 3.3-V operation, clipping starts to occur when VO(PP) = 2.3 V as
opposed to VO(PP) = 4 V at 5 V. The reduced voltage swing subsequently reduces maximum output power into an
8-
load before distortion becomes significant.
Operation from 3.3-V supplies, as can be shown from the efficiency formula in Equation 4, consumes
approximately two-thirds the supply power for a given output-power level than operation from 5-V supplies.
Linear power amplifiers dissipate a significant amount of heat in the package under normal operating conditions.
A typical music CD requires 12 dB to 15 dB of dynamic headroom to pass the loudest portions without distortion
as compared with the average power output. The TPA321 data sheet shows that when the TPA321 is operating
from a 5-V supply into a 8-
speaker, 350 mW peaks are available. Converting watts to dB:
Subtracting the headroom restriction to obtain the average listening level without distortion yields:
4.6 dB – 15 dB = –19.6 dB (15-dB headroom)
4.6 dB – 12 dB = –16.6 dB (12-dB headroom)
4.6 dB – 9 dB = –13.6 dB (9-dB headroom)
4.6 dB – 6 dB = –10.6 dB (6-dB headroom)
4.6 dB – 3 dB = –7.6 dB (3-dB headroom)
Converting dB back into watts:
PW = 10
PdB/10
× P
ref
= 11 mW (15 dB headroom)
= 22 mW (12-dB headroom)
= 44 mW (9-dB headroom)
= 88 mW (6-dB headroom)
= 175 mW (3-dB headroom)
This is valuable information to consider when attempting to estimate the heat dissipation requirements for the
amplifier system. Comparing the absolute worst case, which is 350 mW of continuous power output with 0 dB of
headroom, against 12-dB and 15-dB applications drastically affects maximum ambient temperature ratings for
the system. Using the power dissipation curves for a 5-V, 8-
system, the internal dissipation in the TPA321 and
maximum ambient temperatures is shown in Table 2.
19
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(lèi)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(kāi)發(fā)工具 TPA321 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類(lèi)型:Audio Amplifiers 工具用于評(píng)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(lèi)型:D 類(lèi) 電壓 - 電源:7 V ~ 32 V 安裝類(lèi)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(pán) 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(lèi)型:D 類(lèi) 輸出類(lèi)型:2 通道（立體聲） 不同負(fù)載時(shí)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(lèi)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(pán) 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(lèi)型:D 類(lèi) 輸出類(lèi)型:2 通道（立體聲） 不同負(fù)載時(shí)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(lèi)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(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

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

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

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*