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參數資料
| 型號： | TPA4860DRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | GREEN, PLASTIC, MS-012AC, SOIC-16 |
| 文件頁數： | 6/27頁 |
| 文件大小： | 632K |
| 代理商： | TPA4860DRG4 |
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APPLICATION INFORMATION
BRIDGED-TIED LOAD VERSUS SINGLE-ENDED MODE
Power +
V
(RMS)
2
R
L
V
(RMS) +
V
O(PP)
2
(1)
RL
2x VO(PP)
VO(PP)
–VO(PP)
VDD
fc +
1
2p R
L CC
(2)
TPA4860
SLOS164B – SEPTEMBER 1996 – REVISED JUNE 2004
Figure 34 shows a linear audio power amplifier (APA) in a bridge-tied load (BTL) configuration. A BTL amplifier
actually consists of two linear amplifiers driving both ends of the load. There are several potential benefits to this
differential drive configuration but initially let us 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. Plugging twice the voltage into the power
equation, where voltage is squared, yields 4 times the output power from the same supply rail and load
impedance (see Equation 1).
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) limit of 250 mW to 1 W. In sound power, that is a 6-dB improvement which is 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 40 F to 1000 F); so, they tend to be expensive,
occupy valuable PCB area, and have the additional drawback of limiting 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 2.
For example, a 68-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.
14
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PDF描述 |
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| TPA4860Y | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC16 |
| TPA4861DR | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA4861D | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA4861DG4 | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA4861DRG4 | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA4860EVM | 功能描述:音頻 IC 開發工具 TPA4860 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 |
| TPA4861 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER |
| TPA4861_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER |
| TPA4861D | 功能描述:音頻放大器 1W Mono Audio 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 |
| TPA4861DG4 | 功能描述:音頻放大器 1W Mono Audio 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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