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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： | 9/27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
17
WWW.TI.COM
APPLICATION INFORMATION
effects of applying a square wave into a speaker
Audio specialists have said 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, is not significant because the speaker cone movement is proportional to 1/f2 for frequencies beyond
the audio band. Therefore, the amount of cone movement at the switching frequency is very small. However,
damage could occur to the speaker if the voice coil is not designed to handle the additional power. To size the
speaker for added power, the ripple current dissipated in the load needs to be calculated by subtracting the
theoretical supplied power, PSUP THEORETICAL, from the actual supply power, PSUP, at maximum output power,
POUT. The switching power dissipated in the speaker is the inverse of the measured efficiency, ηMEASURED,
minus the theoretical efficiency,
ηTHEORETICAL.
(1)
PSPKR = PSUP – PSUP THEORETICAL (at max output power)
(2)
PSPKR = PSUP / POUT – PSUP THEORETICAL / POUT (at max output power)
(3)
PSPKR = 1/ηMEASURED – 1/ηTHEORETICAL (at max output power)
The maximum efficiency of the TPA2000D4 with an 8-
load is 85%. Using equation 3 with the efficiency at
maximum power from Figure 2 (78%), we see that there is an additional 106 mW dissipated in the speaker. The
added power dissipated in the speaker is not an issue as long as it is taken into account when choosing the
speaker.
when to use an output filter
Design the TPA2000D4 without the filter if the traces from amplifier to speaker are short. The TPA2000D4
passed FCC and CE radiated emissions with no shielding with speaker wires 8 inches long or less. Notebook
PCs and powered speakers where the speaker is in the same enclosure as the amplifier are good applications
for class-D without a filter.
A ferrite bead filter can often be used if the design is failing radiated emissions without a filter, and the frequency
sensitive circuit is greater than 1 MHz. This is good for circuits that just have to pass FCC and CE because FCC
and CE only test radiated emissions greater than 30 MHz. If choosing a ferrite bead, choose one with high
impedance at high frequencies, but very low impedance at low frequencies.
Use an output filter if there are low frequency (< 1 MHz) EMI sensitive circuits and/or there are long leads from
amplifier to speaker.
gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA2000D4 is set by two input terminals, GAIN0 and GAIN1.
The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance, ZI, to be dependent on the gain setting. The actual gain settings are controlled
by ratios of resistors, so the actual gain distribution from part-to-part is quite good. However, the input
impedance may shift by 30% due to shifts in the actual resistance of the input resistors.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 20 k
, which is the absolute minimum input impedance of the TPA2000D4. At the higher gain
settings, the input impedance could increase as high as 115 k
.
相关PDF资料 |
PDF描述 |
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| 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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