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| 型号： | TPA2000D4DAPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO32 |
| 封装： | PLASTIC, HTSSOP-32 |
| 文件页数： | 8/27页 |
| 文件大小： | 579K |
| 代理商： | TPA2000D4DAPR |
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TPA2000D4
STEREO 2W CLASSD AUDIO POWER AMPLIFIER
WITH STEREO HP AMPLIFIER
SLOS337B DECEMBER 2000 REVISED NOVEMBER 2005
16
WWW.TI.COM
APPLICATION INFORMATION
0 V
5 V
Current
OUT+
OUT
Differential
Voltage
Across
Load
0 V
5 V
Current
OUT+
OUT
Differential
Voltage
Across
Load
Output = 0 V
Output > 0 V
Figure 28. 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 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 that results in less power
dissipated, which increases efficiency.
相关PDF资料 |
PDF描述 |
|---|---|
| TPA2000D4DAP | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO32 |
| TPA2000D4DAPG4 | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO32 |
| TPA2000D4GQC | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA32 |
| TPA2001D1GQCR | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA48 |
| TPA2001D1GQC | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA2000D4DAPRG4 | 功能描述:音频放大器 Stereo Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA2000D4EVM | 功能描述:音频 IC 开发工具 TPA2000D4 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA2000D4GQC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:AUDIO AMPLIFIER|DUAL|CMOS|BGA|48PIN|PLASTIC |
| TPA2001D1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2001D1_06 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER |
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