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0 v
–12 v
+12 v
电流
OUTP
差别的 voltage
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OUTN
TPA3007D1MODULATIONSCHEME
TPA3007D1
SLOS418A–SEPTEMBER2003–REVISEDDECEMBER2004
applicationinformation(持续)
figure14.traditionalclass-dmodulationscheme'soutputvoltageandcurrentwaveformsintoan
InductiveLoadWithNoInput
TheTPA3007D1usesamodulationschemethatstillhaseachoutputswitchingfromgroundtoV
CC
.不管怎样,
outpandoutnarenowinphasewitheachotherwithnoinput.thedutycycleofoutpisgreaterthan50%
andoutnislessthan50%forpositiveoutputvoltages.thedutycycleofoutpislessthan50%andoutnis
greaterthan50%fornegativeoutputvoltages.thevoltageacrosstheloadis0vthroughoutmostofthe
switchingperiod,greatlyreducingtheswitchingcurrent,whichreducesanyi
2
rlossesintheload.(看
figure15).
11