參數(shù)資料
型號: TPA032D04DCAR
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48
封裝: GREEN, PLASTIC, HTSSOP-48
文件頁數(shù): 10/26頁
文件大?。?/td> 439K
代理商: TPA032D04DCAR
TPA032D04
10W STEREO CLASSD AUDIO POWER AMPLIFIER
SLOS203B DECEMBER 1999 REVISED JUNE 2000
19
TI.COM
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 log
P
PK
Prms
Time
PPK
Power
PRMS
Figure 11. Audio Signal Showing Peak and RMS Power
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