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參數(shù)資料
| 型號： | TPA3121D2PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | AUDIO AMPLIFIER, PDSO24 |
| 封裝： | PLASTIC, HTSSOP-24 |
| 文件頁數(shù)： | 4/29頁 |
| 文件大小： | 860K |
| 代理商： | TPA3121D2PWPRG4 |
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APPLICATION INFORMATION
CLASS-D OPERATION
Traditional Class-D Modulation Scheme
+VCC
0V
OutputCurrent
+VCC
0V
+VCC
0V
+VCC
0V
–VCC
DifferentialVoltage
AcrossSpeaker
Supply Pumping
SLOS537 – MAY 2008........................................................................................................................................................................................................ www.ti.com
This section focuses on the class-D operation of the TPA3121D2.
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
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, Texas Instruments Incorporated
Product Folder Link(s): TPA3121D2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPA3121D2PWP | AUDIO AMPLIFIER, PDSO24 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA3122D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3122D2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA3122D2EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
| TPA3122D2N | 功能描述:音頻放大器 15W STEREO CLASS-D AUDIO POWER AMP RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3123D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3123D2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA3123D2EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
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