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參數資料
| 型號： | TPA321DGNRG4 |
| 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, MSOP-8 |
| 文件頁數： | 5/29頁 |
| 文件大?。?/td> | 773K |
| 代理商： | TPA321DGNRG4 |
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APPLICATION INFORMATION
BRIDGE-TIED LOAD
Power +
V
(RMS)
2
R
L
V
(RMS) +
V
O(PP)
2 2
(1)
RL
2x VO(PP)
VO(PP)
-VO(PP)
VDD
fc +
1
2p R
L CC
(2)
TPA321
SLOS312C – JUNE 2000 – REVISED JUNE 2004
Figure 23 shows a linear audio power amplifier (APA) in a BTL configuration. The TPA321 BTL amplifier consists
of two linear amplifiers driving both ends of the load. There are several potential benefits to this differential drive
configuration but power to the load should be initially considered. 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 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 1).
Figure 23. Bridge-Tied Load Configuration
In a typical portable handheld equipment sound channel operating at 3.3 V, bridging raises the power into an 8-
speaker from a single-ended (SE, ground reference) limit of 62.5 mW to 250 mW. 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 24. 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 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, eliminating 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.
13
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相關代理商/技術參數 |
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| TPA321DR | 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 |
| TPA321DRG4 | 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 |
| TPA321EVM | 功能描述:音頻 IC 開發(fā)工具 TPA321 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 |
| TPA3221DDV | 功能描述:HIGH POWER AMPLIFIER 制造商:texas instruments 系列:- 包裝:管件 零件狀態(tài):在售 類型:D 類 電壓 - 電源:7 V ~ 32 V 安裝類型:表面貼裝 工作溫度:0°C ~ 70°C 供應商器件封裝:44-HTSSOP 封裝/外殼:44-TSSOP（0.240"，6.10mm 寬）裸露焊盤 標準包裝:35 |
| TPA3244DDWR | 功能描述:IC AMP AUDIO CLASS D 44-HTSSOP 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:D 類 輸出類型:2 通道（立體聲） 不同負載時的最大輸出功率 x 通道數:60W x 2 @ 8 歐姆 電壓 - 電源:12 V ~ 31.5 V 特性:消除爆音，短路保護 安裝類型:表面貼裝 工作溫度:最高 750.2°F（399°C） 供應商器件封裝:44-HTSSOP 封裝/外殼:44-TSSOP（0.240"，6.10mm 寬）裸露焊盤 標準包裝:1 |
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