參數(shù)資料
型號(hào)： TPA3100D2RGZR-P
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
封裝： 7 X 7 MM, GREEN, PLASTIC, QFN-48
文件頁(yè)數(shù)： 20/39頁(yè)
文件大小： 1298K
代理商： TPA3100D2RGZR-P
www.ti.com
Analyzer
20Hz-20kHz
(a)BasicClass-AB
APA
Signal
Generator
PowerSupply
Analyzer
20Hz-20kHz
R
L
(b)Filter-FreeandTraditionalClass-D
Class-D APA
Signal
Generator
PowerSupply
R
L
Low-PassRC
Filter
Low-PassRC
Filter
(Seenote A)
SLOS469E – OCTOBER 2005 – REVISED MAY 2007
harmonics are present). An analyzer is then connected to the APA output to measure the voltage output. The
analyzer must be capable of measuring the entire audio bandwidth. A regulated dc power supply is used to
reduce the noise and distortion injected into the APA through the power pins. A System Two audio
measurement system (AP-II) (Reference 1) by Audio Precision includes the signal generator and analyzer in one
package.
The generator output and amplifier input must be ac-coupled. However, the EVMs already have the ac-coupling
capacitors, (CIN), so no additional coupling is required. The generator output impedance should be low to avoid
attenuating the test signal, and is important because the input resistance of APAs is not high. Conversely, the
analyzer-input impedance should be high. The output resistance, ROUT, of the APA is normally in the hundreds
of milliohms and can be ignored for all but the power-related calculations.
Figure 35(a) shows a class-AB amplifier system. It takes an analog signal input and produces an analog signal
output. This amplifier circuit can be directly connected to the AP-II or other analyzer input.
This is not true of the class-D amplifier system shown in Figure 35(b), which requires low-pass filters in most
cases in order to measure the audio output waveforms. This is because it takes an analog input signal and
converts it into a pulse-width modulated (PWM) output signal that is not accurately processed by some
analyzers.
A.
For efficiency measurements with filter-free Class-D, RL should be an inductive load like a speaker.
Figure 35. Audio Measurement Systems
The TPA3100D2 uses a modulation scheme that does not require an output filter for operation, but they do
sometimes require an RC low-pass filter when making measurements. This is because some analyzer inputs
cannot accurately process the rapidly changing square-wave output and therefore record an extremely high level
of distortion. The RC low-pass measurement filter is used to remove the modulated waveforms so the analyzer
can measure the output sine wave.
27
相關(guān)PDF資料
PDF描述
TPA3100D2RGZR 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2RGZT 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2PHPR 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48
TPA3100D2RGZRG4 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2RGZTG4 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA3100D2RGZT 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2RGZT 制造商:Texas Instruments 功能描述:IC AMP AUDIO PWR 21.8W D 48VQFN
TPA3100D2RGZTG4 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3101D2 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
TPA3101D2_07 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
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