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參數(shù)資料
| 型號(hào)： | TPA2000D4GQC |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA32 |
| 封裝： | PLASTIC, BGA-32 |
| 文件頁(yè)數(shù)： | 8/27頁(yè) |
| 文件大小： | 456K |
| 代理商： | TPA2000D4GQC |
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TPA2000D4
STEREO 2-W CLASS-D AUDIO POWER AMPLIFIER
WITH STEREO HP AMPLIFIER
SLOS337 – DECEMBER 2000
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
eliminating the output filter with the TPA2000D4
This section will focus on why the user can eliminate the output filter with the TPA2000D4.
effect on audio
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.
traditional class-D modulation scheme
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 prefiltered 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 28. Note that even at an average of 0 V across the load (50% duty cycle), the current to the load is
high thus, causing a high supply current.
O V
–5 V
5 V
Current
OUT+
Differential Voltage
Across Load
OUT–
Figure 28. Traditional Class-D Modulation Scheme’s Output Voltage and Current Waveforms Into an
Inductive Load With No Input
TPA2000D4 modulation scheme
The TPA2000D4 uses a modulation scheme that still has each output switching from 0 to the supply voltage.
However, OUT+ and OUT– are now in phase with each other with no input. The duty cycle of OUT+ is greater
than 50% and OUT– is less than 50% for positive voltages. The duty cycle of OUT+ is less than 50% and OUT–
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA2001D1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2001D1_06 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2001D1EVM | 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA2001D1 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA2001D1GQCR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Operational Amplifier |
| TPA2001D1PW | 功能描述:音頻放大器 1W Class-D 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 |
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