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0 v
–12 v
+12 v
电流
OUTP
OUTN
差别的
电压
横过
加载
0 v
–12 v
+12 v
电流
OUTP
OUTN
差别的
电压
横过
加载
输出 = 0 v
输出 > 0 v
DRIVINGTHEOUTPUTINTOCLIPPING
P
o(10% thd)
P
o(1% thd)
1.25
(1)
OUTPUTFILTERCONSIDERATIONS
TPA3007D1
SLOS418A–SEPTEMBER2003–REVISEDDECEMBER2004
applicationinformation(持续)
figure15.thetpa3007d1outputvoltageandcurrentwaveformsintoaninductiveload
TheoutputoftheTPA3007D1maybedrivenintoclippingtoattainahigheroutputpowerthanispossiblewithno
扭曲量.clippingistypicallyquantifiedbyathdmeasurementof10%.theamountofadditionalpowerinto
theloadmaybecalculatedwithequation1.
aferritebeadfilter(showninfigure16)shouldbeusedinordertopassfccand/orceradiatedemissions
specificationsandifafrequencysensitivecircuitoperatinghigherthan1mhzisnearby.theferritefilterreduces
emiaround1mhzandhigher(fccandceonlytestradiatedemissionsgreaterthan30mhz).whenselecting
aferritebead,chooseonewithhighimpedanceathighfrequencies,butverylowimpedanceatlowfrequencies.
useanadditionallcoutputfilteriftherearelowfrequency(<1mhz)emisensitivecircuitsand/ortherearelong
线(greaterthan11inches)fromtheamplifiertothespeaker,asshowninfigure17.
12