Texas Instruments UCC28060EVM Power Supply User Manual


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6.3StartupCharacteristics
6.4BrownoutProtection
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TypicalPerformanceData
Figure15andFigure16illustratetheUCC28060EVMstartupcharacteristics.
Figure15.Start-UpatV
IN
=85V
RMS
,P
OUT
=Figure16.Start-UpatV
IN
=265V
RMS
,P
OUT
=0
350WW
TheUCC28060hasabrownoutprotectionthatshutsdownbothgatedrives(GDAandGDB)whenthe
VINACpindetectsthattheRMSinputvoltageistoolow.ThisEVMwasdesignedtogointoabrownout
statewhenthelinedropsbelow64V
RMS
.OncetheUCC28060controldevicehasdeterminedthatthe
inputisinabrownoutcondition,a400-mstimerstartstoallowthelinetorecoverbeforeshuttingdownthe
gatedrivers.After400msofbrownout,bothgatedriversturnoff,asshowninFigure17andFigure18.
Figure17.Brownoutat85V
RMS
Figure18.Brownoutat265V
RMS
SLUU280B–May2007–RevisedJuly2008UCC28060EVM300-WInterleavedPFCPre-Regulator9
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