參數(shù)資料
型號: TPA032D04DCAR
廠商: Texas Instruments, Inc.
元件分類: 運動控制電子
英文描述: Dual Audio Amplifier
中文描述: 雙音頻放大器
文件頁數(shù): 19/24頁
文件大?。?/td> 350K
代理商: TPA032D04DCAR
TPA032D04
10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS203A – DECEMBER 1999 – 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 (see Figure 11); 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 11. Audio Signal Showing Peak and RMS Power
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