參數(shù)資料
型號： LTC4099EUDC#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20
封裝： 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件頁數(shù)： 21/36頁
文件大?。?/td> 536K
代理商： LTC4099EUDC#TRPBF
LTC4099
4099fd
Reverse-Voltage Protection
The LTC4099 can also be easily protected against the
applicationofreversevoltage,asshowninFigure6.D1
andR1arenecessarytolimitthemaximumVGSseenby
MP1duringpositiveovervoltageevents.D1’sbreakdown
voltagemustbesafelybelowMP1’sBVGS.Thecircuit
showninFigure6offersforwardvoltageprotectionup
to MN1’s BVDSS and reverse-voltage protection up to
MP1’sBVDSS.
NTCthermistorshavetemperaturecharacteristicswhich
areindicatedonresistance-temperatureconversiontables.
TheVishay-DalethermistorNTHS0603N02N1002-FF,used
inthefollowingexamples,hasanominalvalueof10k
andfollowstheVishaycurve2resistance-temperature
characteristic.
Intheexplanationbelow,thefollowingnotationisused.
R25=Valueofthethermistorat25°C
RCOLD=Valueofthermistoratthecoldtrippoint
RHOT=Valueofthethermistoratthehottrippoint
aCOLD=RatioofRCOLDtoR25
aHOT=RatioofRHOTtoR25
RNOM=Primarythermistorbiasresistor(seeFigure7)
R1=Optionaltemperaturerangeadjustmentresistor
(seeFigure8)
ThetrippointsfortheLTC4099’stemperaturequalification
areinternallyprogrammedat0.326NTCBIASforthehot
thresholdand0.738NTCBIASforthecoldthreshold.
Therefore,thehottrippointissetwhen:
RHOT
RNOM + RHOT
NTCBIAS
= 0.326 NTCBIAS
andthecoldtrippointissetwhen:
RCOLD
RNOM + RCOLD
NTCBIAS
= 0.738 NTCBIAS
SolvingtheseequationsforRCOLDandRHOTresultsin
thefollowing:
RHOT=0.4839RNOM
and
RCOLD=2.816RNOM
BysettingRNOMequaltoR25,theaboveequationsresult
in
aHOT=0.4839andaCOLD=2.816.Referencingthese
ratiostotheVishayresistance-temperaturecurve2chart
givesahottrippointofabout45°Candacoldtrippoint
ofabout0°C.Thedifferencebetweenthehotandcoldtrip
pointsisapproximately45°C.
R2
R1
USB/WALL
ADAPTER
4099 F06
C1
D1
MN1
MP1
VBUS POSITIVE PROTECTION UP TO BVDSS OF MN1
VBUS NEGATIVE PROTECTION UP TO BVDSS OF MP1
VBUS
OVSENS
OVGATE
LTC4099
Figure 6. Dual-Polarity Voltage Protection
Alternate NTC Thermistors and Biasing
TheLTC4099providestemperature-qualifiedchargingif
agroundedthermistorandabiasresistorareconnected
toNTC.Byusingabiasresistorwhosevalueisequalto
theroomtemperatureresistanceofthethermistor(R25),
theupperandlowertemperaturesarepreprogrammedto
approximately45°Cand0°C,respectively,whenusinga
Vishaycurve2thermistor.
Theupperandlowertemperaturethresholdscanbead-
justedbyeitheramodificationofthebiasresistorvalue
orbyaddingasecondadjustmentresistortothecircuit.
Ifonlythebiasresistorisadjusted,theneithertheupper
orthelowerthresholdcanbemodified,butnotboth.The
othertrippointwillbedeterminedbythecharacteristics
ofthethermistor.Usingthebiasresistor,inadditiontoan
adjustmentresistor,boththeupperandthelowertem-
peraturetrippointscanbeindependentlyprogrammed
withtheconstraintthatthedifferencebetweentheupper
andlowertemperaturethresholdsmustincrease.Exam-
plesofeachtechniquefollow.
applicaTions inForMaTion
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