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參數資料
| 型號： | TPA321D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 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 |
| 文件頁數： | 6/29頁 |
| 文件大小： | 773K |
| 代理商： | TPA321D |
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RL
CC
VO(PP)
VDD
-3 dB
fc
BTL AMPLIFIER EFFICIENCY
VL(RMS)
VO
IDD
IDD(RMS)
TPA321
SLOS312C – JUNE 2000 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
Figure 24. 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 a SE
configuration. Internal dissipation versus output power is discussed further in the thermal considerations section.
Linear 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 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, IDD(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 values of power in the load and in the
amplifier, the current and voltage waveform shapes must first be understood (see Figure 25).
Figure 25. 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
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.
14
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相關代理商/技術參數 |
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|---|---|
| TPA321D | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS AB 700mW SOIC-8 |
| TPA321DG4 | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA321DGN | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA321DGNG4 | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA321DGNR | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 產品: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 |
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