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| 型號： | TPA3100D2RGZR-P |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 20-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 20 W立體聲D類音頻功率放大器 |
| 文件頁數(shù)： | 18/38頁 |
| 文件大小： | 3258K |
| 代理商： | TPA3100D2RGZR-P |
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0V
-12V
+12V
Current
OUTP
OUTN
Differential
V
oltage
Across
Load
0V
-12V
+12V
Current
OUTP
OUTN
Differential
V
oltage
Across
Load
Output=0V
Output>0V
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 x V
CC
, 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.
When to Use an Output Filter for EMI Suppression
Design the TPA3100D2 without the filter if the traces from amplifier to speaker are short (< 10 cm). Powered
speakers, where the speaker is in the same enclosure as the amplifier, is a typical application for class-D without
a filter.
TPA3100D2
SLOS469D–OCTOBER 2005–REVISED FEBRUARY 2006
APPLICATION INFORMATION (continued)
Figure 26. The TPA3100D2 Output Voltage and Current Waveforms Into an Inductive Load
The TPA3100D2 modulation scheme has little loss in the load without a filter because the pulses are short and
the change in voltage is V
CC
instead of 2 x V
CC
. 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 but higher impedance at the switching
frequency than the speaker, which results in less power dissipation, therefore increasing efficiency.
18
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| 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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