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參數資料
| 型號： | TPA0252PWP |
| 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 |
| 文件頁數： | 14/34頁 |
| 文件大?。?/td> | 851K |
| 代理商： | TPA0252PWP |
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f
(c) +
1
2 p R
L C(C)
(7)
RL
C(C)
VO(PP)
VDD
3 dB
fc
Single-Ended Operation
BTL AMPLIFIER EFFICIENCY
V(LRMS)
VO
IDD
IDD(avg)
TPA0252
SLOS288B – JUNE 2000 – REVISED SEPTEMBER 2004
For example, a 68-F capacitor with an 8-
speaker would attenuate low frequencies below 293 Hz. The BTL
configuration cancels the dc offsets, eliminating the need for 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.
Figure 37. 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 37), 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 38).
Figure 38. Voltage and Current Waveforms for BTL Amplifiers
21
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA0252PWPG4 | 功能描述:音頻放大器 St Class-AB Aud Amp with Dig Vol Control 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 |
| TPA0252PWPR | 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive 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 |
| TPA0252PWPRG4 | 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive 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 |
| TPA0253 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
| TPA0253_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
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