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參數(shù)資料
| 型號： | 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)： | 6/26頁 |
| 文件大?。?/td> | 653K |
| 代理商： | LTC4011CFE#PBF |
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LTC4011
4011fb
operaTion
12
–
+
CC
EA
ITH
IPROG
R3
Q
PWM CLOCK
S
R
R4
R1
BAT
11
SENSE
RSENSE
15
BGATE
17
TGATE
LTC4011
VCC
P
N
R2
4011 F02
Figure2.LTC4011PWMControlLoop
PWMCurrentSourceController
AnintegralpartoftheLTC4011isthePWMcurrentsource
controller.Thechargerusesasynchronousstep-down
architecturetoproducehighefficiencyandlimitedthermal
dissipation.Thenominaloperatingfrequencyof550kHz
allowsuseofasmallerexternalfiltercomponents.The
TGATEandBGATEoutputshaveinternallyclampedvolt-
ageswings.Theysourcepeakcurrentstailoredtosmaller
surface-mountpowerFETslikelytoappearinapplications
providinganaveragechargecurrentof3Aorless.During
thevariouschargingstates,theLTC4011usesthePWM
controllertoregulateanaveragevoltagebetweenSENSE
andBATthatrangesfrom10mVto100mV.
AconceptualdiagramoftheLTC4011PWMcontrolloop
isshowninFigure2.
The voltage across the external current programming
resistorRSENSEisaveragedbyintegratingerroramplifier
EA.Aninternalprogrammingcurrentisalsopulledfrom
inputresistorR1.TheIPROGR1productestablishesthe
desiredaveragevoltagedropacrossRSENSE,andhence,
theaveragecurrentthroughRSENSE.TheITHoutputof
theerroramplifierisascaledcontrolcurrentfortheinput
ofthePWMcomparatorCC.TheITHR3productsetsa
peakcurrentthresholdforCCsuchthatthedesiredaver-
agecurrentthroughRSENSEismaintained.Thecurrent
comparatoroutputdoesthisbyswitchingthestateofthe
SRlatchattheappropriatetime.
Atthebeginningofeachoscillatorcycle,thePWMclock
setstheSRlatchandtheexternalP-channelMOSFETis
switchedon(N-channelMOSFETswitchedoff)torefresh
thecurrentcarriedbytheexternalinductor.Theinductor
current and voltage drop across RSENSEbegintorise
linearly. During normal operation, the PFET is turned
off(NFETon)duringthecyclebyCCwhenthevoltage
differenceacrossRSENSEreachesthepeakvaluesetby
theoutputofEA.Theinductorcurrentthenrampsdown
linearlyuntilthenextrisingPWMclockedge.Thiscloses
theloopandmaintainsthedesiredaveragechargecurrent
intheexternalinductor.
LowDropoutCharging
Afterchargingisinitiated,theLTC4011doesnotrequire
thatVCCremainatleast500mVaboveBATbecausesitu-
ationsexistwherelowdropoutchargingmightoccur.In
oneinstance,parasiticseriesresistancemaylimitPWM
headroom (between VCCandBAT)as100%chargeis
reached.AsecondcasecanarisewhentheDCadapter
selectedbytheenduserisnotcapableofdeliveringthe
currentprogrammedbyRSENSE,causingtheoutputvolt-
ageoftheadaptertocollapse.Whileinlowdropout,the
LTC4011PWMrunsnear100%dutycyclewithafrequency
thatmaynotbeconstantandcanbelessthan550kHz.
Thechargecurrentwilldropbelowtheprogrammedvalue
toavoidgeneratingaudiblenoise,sotheactualcharge
delivered to the battery may depend primarily on the
LTC4011chargetimer.
InternalDieTemperature
TheLTC4011providesinternalovertemperaturedetection
toprotectagainstelectricaloverstress,primarilyatthe
FETdriveroutputs.Ifthedietemperaturerisesabovethis
thermallimit,theLTC4011stopsswitchingandindicates
afaultaspreviouslydiscussed.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
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| LTC4050EMS-4.2#PBF | Lithium-Ion Linear Battery Charger Controller with Thermistor Interface; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +125°C |
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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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