參數(shù)資料
型號(hào)： TPA0233DGQR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻／視頻放大
英文描述： 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 8/26頁(yè)
文件大?。?/td> 711K
代理商： TPA0233DGQR
TPA0233
2W MONO AUDIO POWER AMPLIFIER
WITH HEADPHONE DRIVE
SLOS278D JANUARY 2000 REVISED NOVEMBER 2002
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
BTL amplifier efficiency
Class-AB amplifiers are inefficient. The primary cause of inefficiencies is the 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 sinewave 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, IDDrms, 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 and average values of power in the
load and in the amplifier, the current and voltage waveform shapes must first be understood. See Figure 26.
V(LRMS)
VO
IDD
IDD(avg)
Figure 26. 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 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.
Efficiency of a BTL amplifier
+
P
L
P
SUP
(9)
where
P
L +
V
LRMS
2
R
L
, and V
LRMS +
V
P
2
, therefore, P
L +
V
P
2
2R
L
and PSUP + VDD IDDavg
and
I
DDavg +
1
p
0
V
P
R
L
sin(t) dt
+ 1p
V
P
R
L
[cos(t)]
p
0 +
2V
P
p R
L
therefore,
P
SUP +
2V
DD VP
p R
L
substituting PL and PSUP into equation 9,
Efficiency of a BTL amplifier
+
V
P
2
2R
L
2V
DD VP
p R
L
+
p V
P
4V
DD
V
P +
2P
L RL
where
相關(guān)PDF資料
PDF描述
TPA0233DGQ 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10
TPA0233DGQRG4 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10
TPA0233DGQG4 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10
TPA0242PWP 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
TPA0242PWPR 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA0233DGQRG4 功能描述:音頻放大器 Mono Class-AB w/Ster Hdphn Drv Summed Inp 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
TPA0233EVM 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA0233 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
TPA0233G 制造商:ON Semiconductor 功能描述:THY T0220 SPECIAL SCR
TPA0234G 功能描述:SCR THY C77 SPECIAL SCR RoHS:否 制造商:STMicroelectronics 最大轉(zhuǎn)折電流 IBO:480 A 額定重復(fù)關(guān)閉狀態(tài)電壓 VDRM:600 V 關(guān)閉狀態(tài)漏泄電流（在 VDRM IDRM 下）:5 uA 開(kāi)啟狀態(tài) RMS 電流 (It RMS): 正向電壓下降:1.6 V 柵觸發(fā)電壓 (Vgt):1.3 V 最大柵極峰值反向電壓:5 V 柵觸發(fā)電流 (Igt):35 mA 保持電流（Ih 最大值）:75 mA 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-220 封裝:Tube
TPA0242 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:STEREO 2-W AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL AND MUX CONTROL
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

*
*
*