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| 型號(hào)： | TPA0132PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁(yè)數(shù)： | 14/33頁(yè) |
| 文件大小： | 788K |
| 代理商： | TPA0132PWPRG4 |
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RL
C(C)
VO(PP)
VDD
3 dB
fc
Single-Ended Operation
BTL AMPLIFIER EFFICIENCY
V(LRMS)
VO
IDD
IDD(avg)
TPA0132
SLOS223E – MAY 1999 – REVISED SEPTEMBER 2004
Figure 35. 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, since 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.
In SE mode (see Figure 35), the load is driven from the primary amplifier output for each channel (LOUT+ and
ROUT+).
The amplifier switches to single-ended operation when the SE/BTL terminal is held high. This puts the negative
outputs in a high-impedance state, and reduces the amplifier's gain by 6 dB.
Class-AB amplifiers are inefficient, primarily because of voltage drop across the output-stage transistors. The two
components of the internal voltage drop are the headroom or dc voltage drop that varies inversely to output
power, and 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
(IDDrms) determines the internal power dissipation of the amplifier.
An easy-to-use equation to calculate efficiency begins as 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 waveforms must be understood (see Figure 36).
Figure 36. 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. Therefore, 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.
Equation 7 and Equation 8 are the basis for calculating amplifier efficiency.
21
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0142 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL |
| TPA0142EVM | 功能描述:音頻 IC 開發(fā)工具 TPA0142 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA0142PWP | 功能描述:音頻放大器 2W Stereo A 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 |
| TPA0142PWPG4 | 功能描述:音頻放大器 2W Stereo APA With DC Volume Control 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 |
| TPA0142PWPR | 功能描述:音頻放大器 2W Stereo APA With DC Volume Control 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 |
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