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參數資料
| 型號： | TPA2000D1TPWRG4Q1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | GREEN, PLASTIC, TSSOP-16 |
| 文件頁數： | 2/19頁 |
| 文件大小： | 307K |
| 代理商： | TPA2000D1TPWRG4Q1 |
0 V
5 V
+5 V
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OUTN
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5 V
+5 V
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Output > 0 V
Efficiency: Why Use a Filter With the Traditional Class-D Modulation Scheme
Effects of Applying a Square Wave Into a Speaker
SGLS137E – SEPTEMBER 2002 – REVISED OCTOBER 2008 ........................................................................................................................................ www.ti.com
Figure 10. The TPA2000D1 Output Voltage and Current Waveforms Into an Inductive Load
The main reason that the traditional class-D amplifier needs an output filter is that the switching waveform results
in maximum current flow. This causes more loss in the load, which causes lower efficiency. The ripple current is
large for the traditional modulation scheme because the ripple current is proportional to voltage multiplied by the
time at that voltage. The differential voltage swing is 2 × VDD, and the time at each voltage is half the period for
the traditional modulation scheme. An ideal LC filter is needed to store the ripple current from each half cycle for
the next half cycle, while any resistance causes power dissipation. The speaker is both resistive and reactive,
whereas an LC filter is almost purely reactive.
The TPA2000D1 modulation scheme has little loss in the load without a filter because the pulses are short and
the change in voltage is VDD instead of 2 × VDD. As the output power increases, the pulses widen making the
ripple current larger. Ripple current could be filtered with an LC filter for increased efficiency, but for most
applications, the filter is not needed.
An LC filter with a cut-off frequency less than the class-D switching frequency allows the switching current to flow
through the filter instead of the load. The filter has less resistance than the speaker that results in less power
dissipated, which increases efficiency.
Audio specialists have advised for years not to apply a square wave to speakers. If the amplitude of the
waveform is high enough and the frequency of the square wave is within the bandwidth of the speaker, the
square wave could cause the voice coil to jump out of the air gap and/or scar the voice coil. A 250-kHz switching
frequency, however, is not significant because the speaker cone movement is proportional to 1/f2 for frequencies
beyond the audio band. Therefore, the amount of cone movement at the switching frequency is small. However,
10
Copyright 2002–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2000D1-Q1
相關PDF資料 |
PDF描述 |
|---|---|
| TPA2000D1TPWRQ1 | 2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| TPA2000D2PWPR | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| TPA2000D2PWP | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| TPA2000D2PWR | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| TPA2000D2PW | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA2000D1TPWRQ1 | 功能描述:音頻放大器 Auto Cat Mono Filter Free Class D 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 |
| TPA2000D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2000D2_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W FILTERLESS STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2000D2EVM | 功能描述:音頻 IC 開發工具 TPA2000D2 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 |
| TPA2000D2PW | 功能描述:音頻放大器 Stereo Filter-Free Class-D 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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