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参数资料
| 型号： | TPA321DR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 5/29页 |
| 文件大小： | 773K |
| 代理商： | TPA321DR |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA321DRG4 | 功能描述:音频放大器 350-mW Low-Voltage w/diff inputs RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA321EVM | 功能描述:音频 IC 开发工具 TPA321 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA3221DDV | 功能描述:HIGH POWER AMPLIFIER 制造商:texas instruments 系列:- 包装:管件 零件状态:在售 类型:D 类 电压 - 电源:7 V ~ 32 V 安装类型:表面贴装 工作温度:0°C ~ 70°C 供应商器件封装:44-HTSSOP 封装/外壳:44-TSSOP（0.240"，6.10mm 宽）裸露焊盘 标准包装:35 |
| TPA3244DDWR | 功能描述:IC AMP AUDIO CLASS D 44-HTSSOP 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:在售 类型:D 类 输出类型:2 通道（立体声） 不同负载时的最大输出功率 x 通道数:60W x 2 @ 8 欧姆 电压 - 电源:12 V ~ 31.5 V 特性:消除爆音，短路保护 安装类型:表面贴装 工作温度:最高 750.2°F（399°C） 供应商器件封装:44-HTSSOP 封装/外壳:44-TSSOP（0.240"，6.10mm 宽）裸露焊盘 标准包装:1 |
| TPA3244EVM | 功能描述:EVAL BOARD FOR TPA3244 制造商:texas instruments 系列:PurePath? 零件状态:在售 放大器类型:D 类 输出类型:2 通道（立体声） 不同负载时的最大输出功率 x 通道数:100W x 2 @ 4 欧姆 电压 - 电源:14 V ~ 31.5 V 板类型:完全填充 使用的 IC/零件:TPA3244 所含物品:板 标准包装:1 |
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