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参数资料
| 型号： | TPA3121D2PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | AUDIO AMPLIFIER, PDSO24 |
| 封装： | PLASTIC, HTSSOP-24 |
| 文件页数： | 4/30页 |
| 文件大小： | 749K |
| 代理商： | TPA3121D2PWP |
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+VCC
0V
OutputCurrent
+VCC
0V
+VCC
0V
+VCC
0V
–VCC
DifferentialVoltage
AcrossSpeaker
SLOS537A – MAY 2008 – REVISED AUGUST 2010
www.ti.com
APPLICATION INFORMATION
CLASS-D OPERATION
This section focuses on the class-D operation of the TPA3121D2.
Traditional Class-D Modulation Scheme
The TPA3121D2 operates in AD mode. There are two main configurations that may be used. For stereo
operation, the TPA3121D2 should be configured in a single-ended (SE) half-bridge amplifier. For mono
applications, TPA3121D2 may be used as a bridge-tied-load (BTL) amplifier. The traditional class-D modulation
scheme, which is used in the TPA3121D2 BTL configuration, has a differential output where each output is 180
degrees out of phase and changes from ground to the supply voltage, VCC. Therefore, the differential prefiltered
output
varies
between
positive
and
negative
VCC,
where
filtered
50%
duty
cycle
yields
0 V across the load. The class-D modulation scheme with voltage and current waveforms is shown in Figure 25
and Figure 26.
Figure 25. Class-D Modulation for TPA3121D2 SE Configuration
Figure 26. Class-D Modulation for TPA3121D2 BTL Configuration
Supply Pumping
One issue encountered in single-ended (SE) class-D amplifier designs is supply pumping. Power-supply pumping
is a rise in the local supply voltage due to energy being driven back to the supply by operation of the class-D
amplifier. This phenomenon is most evident at low audio frequencies and when both channels are operating at
the same frequency and phase. At low levels, power-supply pumping results in distortion in the audio output due
to fluctuations in supply voltage. At higher levels, pumping can cause the overvoltage protection to operate,
which temporarily shuts down the audio output.
12
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPA3121D2
相关PDF资料 |
PDF描述 |
|---|---|
| TPA3121D2PWPR | AUDIO AMPLIFIER, PDSO24 |
| TPA3122D2N | 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP20 |
| TPA3123D2PWPG4 | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| TPA3123D2PWPRG4 | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA3121D2PWPG4 | 功能描述:音频放大器 15W Stereo Class-D Aud Pwr Amp 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 |
| TPA3121D2PWPR | 功能描述:音频放大器 15W Stereo Class-D Aud Pwr Amp 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 |
| TPA3121D2PWPRG4 | 功能描述:音频放大器 15W Stereo Class-D Aud Pwr Amp 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 |
| TPA3122D2 | 制造商:TI 制造商全称:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3122D2EVM | 功能描述:音频 IC 开发工具 TPA3122D2EVM 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 |
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