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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： | 19/19頁 |
| 文件大小： | 307K |
| 代理商： | TPA2000D1TPWRG4Q1 |
APPLICATION INFORMATION
Eliminating the Output Filter With the TPA2000D1
Effect on Audio
Traditional Class-D Modulation Scheme
O V
5 V
+5 V
Current
OUTP
Differential Voltage
Across Load
OUTN
TPA2000D1 Modulation Scheme
www.ti.com ........................................................................................................................................ SGLS137E – SEPTEMBER 2002 – REVISED OCTOBER 2008
This section explains why the user can eliminate the output filter with the TPA2000D1.
The class-D amplifier outputs a pulse-width modulated (PWM) square wave, which is the sum of the switching
waveform and the amplified input audio signal. The human ear acts as a band-pass filter such that only the
frequencies between approximately 20 Hz and 20 kHz are passed. The switching frequency components are
much greater than 20 kHz, so the only signal heard is the amplified input audio signal.
The traditional class-D modulation scheme, which is used in the TPA005Dxx family, has a differential output
where each output is 180 degrees out of phase and changes from ground to the supply voltage, VDD. Therefore,
the differential pre-filtered output varies between positive and negative VDD, where filtered 50% duty cycle yields
0 V across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown in
Figure 9. Even at an average of 0 V across the load (50% duty cycle), the current to the load is high, causing
high loss, thus causing a high supply current.
Figure 9. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms Into an
Inductive Load With No Input
The TPA2000D1 uses a modulation scheme that still has each output switching from 0 to the supply voltage.
However, OUTP and OUTN are now in phase with each other with no input. The duty cycle of OUTP is greater
than 50% and OUTN is less than 50% for positive voltages. The duty cycle of OUTP is less than 50% and OUTN
is greater than 50% for negative voltages. The voltage across the load sits at 0 V throughout most of the
switching period, greatly reducing the switching current, which reduces any I2R losses in the load.
Copyright 2002–2008, Texas Instruments Incorporated
9
Product Folder Link(s): TPA2000D1-Q1
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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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