參數(shù)資料
型號： TPA3002D2PHPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48
封裝： GREEN, PLASTIC, HTQFP-48
文件頁數(shù)： 13/40頁
文件大?。?/td> 735K
代理商： TPA3002D2PHPR
TPA3002D2
SLOS402C DECEMBER 2002 REVISED JANUARY 2004
www.ti.com
20
0 V
12 V
+12 V
Current
OUTP
OUTN
Differential
Voltage
Across
Load
0 V
12 V
+12 V
Current
OUTP
OUTN
Differential
Voltage
Across
Load
Output = 0 V
Output > 0 V
Figure 32. The TPA3002D2 Output Voltage and Current Waveforms Into an Inductive Load
Efficiency: LC Filter Required With the Traditional Class-D Modulation Scheme
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
× VCC, 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 TPA3002D2 modulation scheme has very little loss in the load without a filter because the pulses are very
short and the change in voltage is VCC instead of 2 × VCC. 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 cutoff 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, which results in less
power dissipation, therefore increasing efficiency.
Effects of Applying a Square Wave Into a Speaker
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, does not significantly move the voice coil, as the cone movement is proportional to 1/f2
for frequencies beyond the audio band.
相關(guān)PDF資料
PDF描述
TPA3002D2PHP 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48
TPA3002D2PHPRG4 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48
TPA3002D2PHPG4 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48
TPA3003D2PFBR 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48
TPA3003D2PFB 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA3002D2PHPRG4 功能描述:音頻放大器 Stereo Med Pwr Filter-Free 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
TPA3003D2 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-Q STEREO CLASS-D AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL
TPA3003D2_06 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-Q STEREO CLASS-D AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL
TPA3003D2EVM 功能描述:音頻 IC 開發(fā)工具 TPA3003D2 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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
TPA3003D2PFB 功能描述:音頻放大器 Ster Lo-Pwr Wide Sply Vltg 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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