元器件交易网
SGLS371–JANUARY2007
GENERALINFORMATION(continued)
Current-LimitResistor
Selection
eatoavoidproblemswithringingsignalsandnuisancetripping.WhentheFETisonandthecontrollersenses100mVormoredropfromtheVDDpintotheISNSpin,anovercurrentconditionisdeclared.Whenthishappens,theFETisturnedoffand,asshowninFigure28thesoft-startcapacitorisdischarged.Whenthesoft-startcapacitorreachesalevelbelow150clearstheovercurrentconditionflagandattemptstorestart.Iftheconditionthatcausedtheovercurrenteventtooccurisstillpresentontheoutputoftheconverter(seeFigure27anotherovercurrentconditionisdeclaredandtheprocessrepeatsindefinitely.Figure27showscapacitorvoltageduringanextendedoutputfaultcondition.Theoveralldutyconductionduringapersistentfaultisapproximately2%.
Figure25.TypicalSoft-StartCapacitorandVOUTDuringOvercurrent
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