參數(shù)資料
型號(hào)： LTC4011CFE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C
中文描述： BATTERY CHARGE CONTROLLER, 640 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20
文件頁數(shù)： 5/26頁
文件大小： 653K
代理商： LTC4011CFE#PBF
LTC4011
4011fb
operaTion
Top-OffChargeState
IfNiMHfastchargeterminationoccursbecausethe
T/tlimitisexceededafteraninitialperiodoftMAX/12
hasexpired,theLTC4011entersthetop-offchargestate.
Top-offchargeisimplementedbysourcingone-tenththe
programmedchargecurrentfortMAX/3minutestoensure
that100%chargehasbeendeliveredtothebattery.The
CHRGandTOCstatusoutputsareactiveduringthetop-off
state.IfNiCdcellshavebeenselectedwiththeCHEMpin,
theLTC4011neverentersthetop-offstate.
AutomaticRechargeState
Oncechargingiscomplete,theautomaticrechargestate
isenteredtoaddresstheself-dischargecharacteristics
ofnickelchemistrycells.Thechargestatusoutputsare
inactive during automatic recharge, but VCDIVremains
switchedtoGNDtomonitortheaveragecellvoltage.Ifthe
VCELLvoltagedropsbelow1.325Vwithoutfallingbelow
350mV,thechargetimerisresetandanewfastcharge
cycleisinitiated.
TheinternalterminationalgorithmsoftheLTC4011are
adjustedwhenafastchargecycleisinitiatedfromauto-
maticrecharge,becausethebatteryshouldbealmostfully
charged.Voltage-basedterminationisenabledimmediately
andtheNiMHT/tlimitisfixedatabatterytemperature
riseof1°C/minute.
FaultState
Asdiscussedpreviously,theLTC4011entersthefaultstate
basedondetectionofinvalidbatteryvoltagesduringvari-
ouschargingphases.TheICalsomonitorstheregulation
ofthePWMcontrolloopandwillenterthefaultstateif
thisisnotwithinacceptablelimits.Onceinthefaultstate,
thebatterymustberemovedorDCinputpowermustbe
cycledinordertoinitiatefurthercharging.Inthefault
state,theFAULToutputisactive,theREADYoutputis
inactive,chargingstopsandthechargeindicatoroutputs
areinactive.TheVCDIVoutputremainsconnectedtoGND
toallowdetectionofbatteryremoval.
NotethattheLTC4011alsousestheFAULToutputtoindi-
catethatchargingissuspendedduetoinvalidbatteryor
internaldietemperatures.However,theICdoesnotenter
thefaultstateinthesecasesandnormaloperationwill
resumewhenalltemperaturesreturntoacceptablelevels.
RefertotheStatusOutputssectionformoredetail.
InsertionandRemovalofBatteries
TheLTC4011automaticallysensestheinsertionorremoval
ofabatterybymonitoringtheVCELLpinvoltage.Should
thisvoltagefallbelow350mV,theICconsidersthebat-
terytobeabsent.Removingandtheninsertingabattery
causestheLTC4011toinitiateacompletelynewcharge
cyclebeginningwithchargequalification.
ExternalPauseControl
Afterchargingisinitiated,theVTEMPpinmaybeusedto
pauseoperationatanytime.Whenthevoltagebetween
VTEMPandGNDdropsbelow200mV,thechargetimer
pauses,fastchargeterminationalgorithmsareinhibited
andthePWMoutputsaredisabled.ThestatusandVCDIV
outputsallremainactive.Normalfunctionisfullyrestored
fromthepreviousstatewhenpauseends.
StatusOutputs
TheLTC4011open-drainstatusoutputsprovidevaluable
information about the IC’s operating state and can be
usedforavarietyofpurposesinapplications.Table1
summarizesthestateofthefourstatusoutputsandthe
VCDIVpinasafunctionofLTC4011operation.Thestatus
outputscandirectlydrivecurrent-limitedLEDsterminated
totheDCinput.TheVCDIVcolumninTable1isstrictly
informational.VCDIVshouldonlybeusedfortheVCELL
resistordivider,aspreviouslydiscussed.
Table1.LTC4011StatusPins
READY FAULT
CHRG
TOC
VCDIV
CHARGERSTATE
Off
On
Off
On
ReadytoCharge
(VTEMPHeldLow)
orAutomaticRecharge
On
Off
On
Off
On
PrechargeorFastCharge
(MaybePaused)
On
Off
On
NiMHTop-OffCharge
(MaybePaused)
On
OnorOff OnorOff On
TemperatureLimits
Exceeded
Off
On
Off
On
FaultState(Latched)
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4011CFETR 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger
LTC4011CFETRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger
LTC4011EFE 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger
LTC4012 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control
LTC4012-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control
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