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| 型号： | TPA2001D1GQCR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA48 |
| 封装： | 4 X 4 MM, MICRO, PLASTIC, BGA-48 |
| 文件页数： | 11/14页 |
| 文件大小： | 201K |
| 代理商： | TPA2001D1GQCR |
TPA2001D1
1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER
SLOS338B – SEPTEMBER 2000 – REVISED AUGUST 2002
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
0 V
–5 V
+5 V
Current
OUTP
OUTN
Differential
Voltage
Across
Load
0 V
–5 V
+5 V
Current
OUTP
OUTN
Differential
Voltage
Across
Load
Output = 0 V
Output > 0 V
Figure 2. The TPA2001D1 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 TPA2001D1 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.
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PDF描述 |
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| TPA2001D1GQC | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA48 |
| TPA2001D1PWRG4 | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| TPA2001D1PWG4 | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| TPA2001D2PWPR | 1 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| TPA2001D2PWP | 1 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA2001D1PW | 功能描述:音频放大器 1W 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 |
| TPA2001D1PW | 制造商:Texas Instruments 功能描述:AUDIO POWER AMP CLASS-D 16TSSOP 制造商:Texas Instruments 功能描述:AUDIO POWER AMP, CLASS-D, 16TSSOP |
| TPA2001D1PW | 制造商:Texas Instruments 功能描述:AUDIO POWER AMPLIFIER IC ((NW)) |
| TPA2001D1PWG4 | 功能描述:音频放大器 Mono 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 |
| TPA2001D1PWR | 功能描述:音频放大器 Mono 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 |
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