TPS40200-EP中文资料(12)
时间:2025-03-09
时间:2025-03-09
元器件交易网
SGLS371–JANUARY2007
GENERALINFORMATION(continued)
VFigure26.Current-LimitReset
Ifnecessary,asmallR-Cfiltercanbeaddedtothecurrent-sensingnetworktoreducenuisancetrippingduetonoisepickup.Thisfilteralsocanbeusedtotrimtheovercurrenttrippointtoahigherlevelwiththeadditionofasingleresistor.SeeFigure27ThenominalovercurrenttrippointusingthecircuitofFigure27isdescribedas:
VR+RF2
IOC=ILIM´F1
RILIMRF2(3)Where:
IOC=Overcurrenttrippoint,peakcurrentintheinductor
VILIM=OvercurrentthresholdvoltagefortheTPS40200,typically100mVRILIM=Valueofthecurrentsenseresistor(in )RandR=Valuesofthescalingresistors(in )
ThevalueofthecapacitorisdeterminedbythenominalpulsewidthoftheconverterandthevaluesofthescalingresistorsRF1andRF2.Itisbestnottohavethetimeconstantofthefilterlongerthanthenominalpulsewidthoftheconverter,ingthisconstraint,thecapacitorvaluemaybeboundedby:.
VOR´Rf2
Cf£÷f1
VIN´fSWRf1+Rf2(4)Where:
Cf=Valueofthecurrent-limitfiltercapacitor(inF)VO=OutputvoltageoftheconverterVIN=InputvoltagetotheconverterfSW=Converterswitchingfrequency
Rf1andRf2=Valuesofthescalingresistors(in )
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