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參數資料
| 型號： | TPA3004D2PHPRG4 |
| 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： | 16/46頁 |
| 文件大小： | 838K |
| 代理商： | TPA3004D2PHPRG4 |
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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
www.ti.com
SLOS407E – FEBRUARY 2003 – REVISED JANUARY 2011
Figure 38. The TPA3004D2 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 TPA3004D2 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.
Copyright 2003–2011, Texas Instruments Incorporated
23
Product Folder Link(s): TPA3004D2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA3005D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3005D2EVM | 功能描述:音頻 IC 開發工具 TPA3005D2 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 |
| TPA3005D2PHP | 功能描述:音頻放大器 Stereo Med Power 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 |
| TPA3005D2PHPG4 | 功能描述:音頻放大器 Stereo Med Power 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 |
| TPA3005D2PHPR | 功能描述:音頻放大器 Stereo Med Power 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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