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參數(shù)資料
| 型號： | TPA6017A2PWPR |
| 元件分類： | 音頻放大器 |
| 英文描述： | AUDIO AMPLIFIER|DUAL|CMOS|TSSOP|20PIN|PLASTIC |
| 中文描述： | 音頻放大器|雙|的CMOS | TSSOP封裝| 20針|塑料 |
| 文件頁數(shù)： | 27/33頁 |
| 文件大?。?/td> | 469K |
| 代理商： | TPA6017A2PWPR |
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TPA6011A4
SLOS392
–
FEBRUARY 2002
27
www.ti.com
APPLICATION INFORMATION
bridged-tied load versus single-ended lode (continued)
For example, a 68-
μ
F capacitor with an 8-
speaker would attenuate low frequencies below 293 Hz. The BTL
configuration cancels the dc offsets, which eliminates the need for the blocking capacitors. Low-frequency
performance is then limited only by the input network and speaker response. Cost and PCB space are also
minimized by eliminating the bulky coupling capacitor.
RL
C(C)
VO(PP)
VO(PP)
VDD
–
3 dB
fc
Figure 36. 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 the SE
configuration. Internal dissipation versus output power is discussed further in the
crest factor and thermal
considerations
section.
single-ended operation
In SE mode (see Figure 36), the load is driven from the primary amplifier output for each channel (OUT+).
The amplifier switches single-ended operation when the SE/BTL terminal is held high. This puts the negative
outputs in a high-impedance state, and effectively reduces the amplifier
’
s gain by 6 dB.
BTL amplifier efficiency
Class-AB 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 sinewave nature of the output.
The total voltage drop can be calculated by subtracting the RMS value of the output voltage from V
DD
. The
internal voltage drop multiplied by the RMS value of the supply current (I
DD
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 and average values of power in the
load and in the amplifier, the current and voltage waveform shapes must first be understood (see Figure 37).
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| TPA6017A2PWPRG4 | 功能描述:音頻放大器 Stereo Cost Eff Class-AB 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 |
| TPA6019A4PWPR | 制造商:Texas Instruments 功能描述:AUDIO AMP 制造商:TI 功能描述:STEREO BTL 1W AUDIO POWER AMPLIFIER |
| TPA6020A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.8-W STEREO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
| TPA6020A2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA6020A2 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 |
| TPA6020A2RGW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.8-W STEREO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
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