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參數資料
| 型號： | TPA005D02DCA |
| 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, PDSO48 |
| 封裝： | PLASTIC, HTSSOP-48 |
| 文件頁數： | 11/25頁 |
| 文件大小： | 373K |
| 代理商： | TPA005D02DCA |
TPA005D02
2-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS227C – AUGUST 1998 – REVISED MARCH 2000
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
class D effect on power supply (continued)
There is a minor power supply savings with a class D amplifier versus a linear amplifier when amplifying sine
waves. The difference is much larger when the amplifier is used strictly for music. This is because music has
much lower RMS output power levels, given the same peak output power (Figure 19); and although linear
devices are relatively efficient at high RMS output levels, they are very inefficient at mid-to-low RMS power
levels. The standard method of comparing the peak power to RMS power for a given signal is crest factor, whose
equation is shown below. The lower RMS power for a set peak power results in a higher crest factor
Crest Factor
+ 10 log
P
PK
Prms
Time
PPK
Power
PRMS
Figure 19. Audio Signal Showing Peak and RMS Power
Figure 20 is a comparison of a 5-V class D amplifier to a similar linear amplifier playing music that has a 13.76-dB
crest factor. From the plot, the power supply draw from a stereo amplifier that is playing music with a 13.76 dB
crest factor is 1.02 W, while a class D amplifier draws 420 mW under the same conditions. This means that just
under 2.5 times the power supply is required for a linear amplifier over a class D amplifier.
600
500
300
200
100
0
400
1
1.5
2
2.5
Power
Supplied
(mW)
POWER SUPPLIED
vs
PEAK OUTPUT VOLTAGE AND PEAK OUTPUT POWER
4
4.5
3
3.5
0.25
0.56
1
1.56
4
5.06
2.25
3.06
Peak Output Voltage (V)
Peak Output Power (W)
TPA0202
TPA005D02
Figure 20. Audio Signal Showing Peak and RMS Power (with Music Applied)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA005D02DCAR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:AUDIO AMPLIFIER|DUAL|TSSOP|48PIN|PLASTIC |
| TPA005D12 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA005D12DCA | 功能描述:音頻放大器 2W Stereo P RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA005D12DCAR | 制造商:Rochester Electronics LLC 功能描述:CLASS-D STEREO AUDIO POWER AMPLIFIER - Bulk |
| TPA005D14 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
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