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參數資料
| 型號： | TPA005D14DCAR |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 音頻放大器 |
| 英文描述： | Amplifier. Other |
| 中文描述： | 放大器。其他 |
| 文件頁數： | 23/29頁 |
| 文件大小： | 420K |
| 代理商： | TPA005D14DCAR |
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TPA005D14
2-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS240A – AUGUST 1999 – REVISED MARCH 2000
23
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 27); 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 logP
PK
P
rms
Time
PPK
P
PRMS
Figure 27. Audio Signal Showing Peak and RMS Power
Figure 28 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
0.56
2
1
2.5
1.56
P
POWER SUPPLIED
vs
PEAK OUTPUT VOLTAGE AND PEAK OUTPUT POWER
4
4
4.5
5.06
3
3.5
3.06
0.25
2.25
Peak Output Voltage (V)
Peak Output Power (W)
TPA0202
TPA005D14
Figure 28. Audio Signal Showing Peak and RMS Power (With Music Applied)
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