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參數(shù)資料
型號： TPA0223DGQ
廠商： Texas Instruments
文件頁數(shù)： 8/26頁
文件大?。?/td> 0K
描述： IC AMP AUDIO PWR 2W MONO 10MSOP
標(biāo)準(zhǔn)包裝： 80
類型： AB 類
輸出類型： 1-通道（單聲道），帶立體聲耳機(jī)
在某負(fù)載時最大輸出功率 x 通道數(shù)量： 2W x 1 @ 4 歐姆; 95mW x 2 @ 32 歐姆
電源電壓： 2.5 V ~ 5.5 V
特點(diǎn)： 消除爆音，輸入多路復(fù)用器，關(guān)機(jī)，熱保護(hù)
安裝類型： 表面貼裝
供應(yīng)商設(shè)備封裝： 10-MSOP-PowerPad
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤
包裝： 管件
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA0223DGQG4 功能描述:音頻放大器 2W Mono Aud Pwr Amp 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
TPA0223DGQR 功能描述:音頻放大器 2W Mono Aud Pwr Amp 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
TPA0223DGQRG4 功能描述:音頻放大器 2W Mono Aud Pwr Amp 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
TPA0223EVM 功能描述:音頻 IC 開發(fā)工具 TPA0223 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
TPA0232 制造商:TI 制造商全稱:Texas Instruments 功能描述:STEREO 2-W AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL AND MUX CONTROL
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