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參數資料
| 型號： | 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 |
| 文件頁數： | 13/33頁 |
| 文件大小： | 788K |
| 代理商： | TPA0132PWPRG4 |
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BRIDGED-TIED LOAD VS SINGLE-ENDED MODE
Power +
V
(rms)
2
R
L
V
(rms) +
V
O(PP)
2 2
(5)
RL
2x VO(PP)
VO(PP)
VDD
f
(c) +
1
2 p R
L C(C)
(6)
TPA0132
SLOS223E – MAY 1999 – REVISED SEPTEMBER 2004
Figure 34 shows a Class-AB audio power amplifier (APA) in a BTL configuration. The TPA0132 amplifier consists
of two Class-AB amplifiers driving both ends of the load. There are several potential benefits to this differential
drive configuration, but, initially consider power to the load. The differential drive to the speaker means that as
one side is slewing up, the other side is slewing down, and vice versa. This in effect doubles the voltage swing
on the load as compared to a ground referenced load. Substituting 2
× V
O(PP) into the power equation, where
voltage is squared, yields 4
× the output power from the same supply rail and load impedance (see Equation 5).
Figure 34. Bridge-Tied Load Configuration
In a typical computer sound channel operating at 5 V, bridging raises the power into an 8-
speaker from a
singled-ended (SE, ground reference) limit of 250 mW to 1 W. In sound power, this is a 6-dB improvement —
loudness that can be heard. In addition to increased power there are frequency-response concerns. Consider the
single-supply SE configuration shown in Figure 35. A coupling capacitor is required to block the dc offset voltage
from reaching the load. These capacitors can be quite large (approximately 33 F to 1000 F), so they tend to be
expensive, heavy, occupy valuable PCB area, and have the additional drawback of limiting the low-frequency
performance of the system. This frequency-limiting effect is due to the high-pass filter network created with the
speaker impedance and the coupling capacitance, and is calculated with Equation 6.
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.
20
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 開發工具 TPA0142 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA0142PWP | 功能描述:音頻放大器 2W Stereo A 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 |
| TPA0142PWPG4 | 功能描述:音頻放大器 2W Stereo APA With DC Volume 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 |
| TPA0142PWPR | 功能描述:音頻放大器 2W Stereo APA With DC Volume 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 |
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