參數(shù)資料
型號： TPA2005D1ZQYRG1
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 1.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA15
封裝： 2.50 X 2.50 MM, GREEN, PLASTIC, BGA-15
文件頁數(shù)： 9/32頁
文件大?。?/td> 1128K
代理商： TPA2005D1ZQYRG1
ELIMINATING THE OUTPUT FILTER WITH THE TPA2005D1
Effect on Audio
Traditional Class-D Modulation Scheme
0 V
–5 V
+5 V
Current
OUT+
Differential Voltage
Across Load
OUT–
TPA2005D1 Modulation Scheme
www.ti.com............................................................................................................................................................... SLOS369F – JULY 2002 – REVISED JULY 2008
This section focuses on why the user can eliminate the output filter with the TPA2005D1.
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 volts across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown
in Figure 39. Note that even at an average of 0 volts across the load (50% duty cycle), the current to the load is
high causing a high loss and thus causing a high supply current.
Figure 39. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms Into an
Inductive Load With no Input
The TPA2005D1 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 volts 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
17
Product Folder Link(s): TPA2005D1
相關PDF資料
PDF描述
TPA2005D1ZQYR 1.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA15
TPA2005D1DGNR 1.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA2005D1DGN 1.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA2005D1DRBRG4 1.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA2005D1DGNG4 1.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
相關代理商/技術參數(shù)
參數(shù)描述
TPA2006D1 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.45-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER WITH 1.8-V COMPATIBLE INPUT THRESHOLDS
TPA2006D1DRB 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.45-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER WITH 1.8-V COMPATIBLE INPUT THRESHOLDS
TPA2006D1DRBR 功能描述:音頻放大器 1.45W Mono Fil-Free Class-D Audio Amp 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
TPA2006D1DRBRG4 功能描述:音頻放大器 1.45W Mono Fil-Free Class-D Audio Amp 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
TPA2006D1DRBT 功能描述:音頻放大器 1.45W Mono Fil-Free Class-D Audio Amp 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
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*