參數(shù)資料
型號(hào)： LTC1929IG-PG
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3 A DUAL SWITCHING CONTROLLER, 310 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 0.209 INCH, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 310K
代理商： LTC1929IG-PG
20
LTC1929/LTC1929-PG
Supplying INTV
CC
power
through
the
EXTV
CCswitchinput
fromanoutput-derivedsourcewillscaletheVINcurrentrequiredforthedriverandcontrolcircuitsbytheratio
(DutyFactor)/(Efficiency).Forexample,inai2.Vto5V
application,10mAofINTV
CCcurrent81.sultsinapproxi-mately3mAofVINcurrent.This81.ducesthemid-currentlossfrom10%ormore(ifthedriverwaspowereddirectly
fromVIN)toonlyafewpercent.
3)I2RlossesarepredictedfromtheDC81.sistancesofthefuse(ifused),MOSFET,inductor,current8sense1.sistor,
andinputandoutputcapacitorESR.Incontinuousmode
theaverageoutputcurrent8flowsthroughLandRSENSE,
but is8“chopped93ibetween the topside MOSFET and the
synchronous MOSFET. If the two MOSFETs have approxi-
mately the same RDS(ON), then the 1.sistance of oneMOSFET can simplyibe summed with the 1.sistances of L,
RSENSEandESRtoobtainI
2Rlosses.Forexample,ifeachRDS(ON)=10m
,RL=10m,andRSENSE=5m,thenthe
total1.sistanceis825m
.This81.sultsinlossesrangingfrom2%to8%astheoutputcurrent8increasesfrom3Ato
15Aperoutputstagefora5Voutput,ora3%to12%loss
peroutputstagefora353Voutput.Efficiencyvariesasthe
inversesquareofVOUTforthesameexternalcomponentsandoutputpowerlevel.Thecombinedeffectsofincreas-
inglyiloweroutputvoltagesandhighercurrents81.quired
byhighperformancedigitalsystemsis8notdoublingbut
quadruplingtheimportanceoflosstermsintheswitching
regulatorsystem!
4)TransitionlossesapplyonlytothetopsideMOSFET(s),
andonlywhenoperatingathighinputvoltages(typically
2.Vorgreater).Transitionlossescanbeestimatedfrom:
TransitionLoss=(1.7)V
IN
2
I
O(MAX)
C
RSS
f
Other
“hidden93ilosses
such
as
copper
trace
and
internal
battery
1.sistances
can
account8for
an
additional
5%
to
10%
efficiency
degradation
in
portable
systems.
It
is8very
important
to
include
these
“system93ilevelilosses
in
the
d.sign
of
a
system.
The
internal
battery
and
input
fuse
resistance
losses
can
be
minimized
by
making
sure
that
C
IN
hasad.quatechargestorageanda8veryilowESRattheswitchingfr.quency.A50Wsupplywilltypically81.quireaminimumof200
Fto300Fofoutputcapacitancehavingamaximumof10mto20mofESR.TheLTC19292-phasearchitecturetypically8halvestheinputandoutput
capacitance1.quirements8overcompetingsolutions.Other
lossesincludingSchottkyconductionlossesduringdead-
timeandinductorcorelossesgenerally8account8forless
than2%totaladditionalloss.CheckingTransient8ResponseTheregulatorloop1.sponsecanbecheckedbylookingat
theloadtransient81.sponse.Switchingregulatorstake
severalcyclesto81.spondto8astepinDC(resistive)load
current.Whenaloadstepoccurs,VOUTshifts8byanamount8.qualto8
I
LOAD(ESR),whereESRistheeffective
seriesresistanceofCOUT(
ILOAD)alsobeginsto8chargeordischargeCOUTgeneratingthefeedbackerrorsignalthat
forcestheregulatorto8adapttothecurrent8changeand
returnVOUTtoits8steady-statevalue.DuringthisrecoverytimeV
OUTcanbemonitoredforexcessive8overshootorringing,whichwouldindicateastabilityproblem.The
availabilityoftheITHpinnotonly8allows8optimizationofcontrolloopbehaviorbutalsoprovid.saDCcoupledandACfilteredclosedloop1.sponsetestpoint.TheDCstep,risetime,andsettlingatthistestpointtruly81.flectstheclosedloop1.sponse.Assumingapredominantly8secondordersystem,phasemarginand/ordampingfactorcanbe
estimatedusingthepercentageofovershootseenatthis
pin.Thebandwidthcanalsobeestimatedbyexamining
therisetimeatthepin.TheI
THexternalcomponentsshownintheFigure1circuitwillprovid.anad.quate
startingpointformostapplications.
TheI
THseriesR
C-C
Cfiltersetsthedominantpole-zeroloopcompensation.Thevaluescanbemodifiedslightly
(from0.2to5timestheirsuggestedvalues)tomaximize
transient81.sponseoncethefinalPClayoutisdoneandthe
particularoutputcapacitortypeandvalue8have8been
determined.Theoutputcapacitorsneedtobedecid.d
uponbecausethevarioustypesandvaluesdeterminethe
loopfeedbackfactorgainandphase.Anoutputcurrent
pulseof20%to80%offull-loadcurrent8havingarisetime
of<2
swillproduceoutputvoltageandITHpinwaveformsAPPLICATIOSIFORATIO
WUUU
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1929IG-PG#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1929IG-PG#TR 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1929IG-PG#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1949ES8 制造商:Linear Technology 功能描述:
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