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)： 9/27頁(yè)
文件大?。?/td> 456K
代理商： TPA2000D4GQC
TPA2000D4
STEREO 2-W CLASS-D AUDIO POWER AMPLIFIER
WITH STEREO HP AMPLIFIER
SLOS337 – DECEMBER 2000
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
0 V
–5 V
5 V
Current
OUT+
OUT–
Differential
Voltage
Across
Load
0 V
–5 V
5 V
Current
OUT+
OUT–
Differential
Voltage
Across
Load
Output = 0 V
Output > 0 V
Figure 29. The TPA2000D4 Output Voltage and Current Waveforms Into an Inductive Load
efficiency: why you must use a filter 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
× VDD 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 TPA2000D4 modulation scheme has very little loss in the load without a filter because the pulses are very
short and the change in voltage is VDD instead of 2 × VDD. 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 cut-off 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 that results in less power
dissipated, which increases efficiency.
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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
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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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