參數(shù)資料
型號(hào)： PMC8218HS
廠商： ERICSSON POWER MODULES AB
元件分類： 電源模塊
英文描述： 1-OUTPUT 24 W DC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT, PACKAGE-6
文件頁數(shù)： 24/34頁
文件大小： 1756K
代理商： PMC8218HS
EN/LZT146064R2A EricssonPowerModules,March2007
PMC8818TSDatasheet
AllPMC8000SeriesDC/DCregulatorshaveapositiveremotesense
pinthatcanbeusedtocompensateformoderateamountsofresist-
anceinthedistributionsystemandallowforvoltageregulationatthe
loadorotherselectedpoint.Theremotesenselinewillcarryverylit-
tlecurrentanddoesnotneedalargecrosssectionalarea.However,
thesenselineonthePCBshouldbelocatedclosetoagroundtrace
orgroundplane.Theremotesensecircuitrywillcompensateforup
to10%voltagedropbetweenthesensevoltageandthevoltageat
theoutputpinsfromVOnom.Iftheremotesenseisnotneededthe
sensepinshouldbeleftopenorconnectedtothepositiveoutput.
Remote Sense
Current Limit Protection
ThePMC8000SeriesDC/DCregulatorsincludecurrentlimitingcir-
cuitrythatallowsthemtowithstandcontinuousoverloadsorshort
circuitconditionsontheoutput.Theoutputvoltagewilldecrease
towardszeroforoutputcurrentsinexcessofmaxoutputcurrent
(Iomax).Whenthecurrentlimitisreachedtheregulatorwillgointo
hiccupmode.
Thecurrentlimitistemperaturedependent,i.e.thelimitdecreaseat
higheroperatingtemperature,theregulatorisguaranteedtostartat
IOmaxx1.25@Tref115°C.
Theregulatorwillresumenormaloperationafterremovalofthe
overload.Theloaddistributionsystemshouldbedesignedtocarry
themaximumoutputshortcircuitcurrentspecified.
Over Temperature Protection (OTP)
ThePMC8000SeriesDC/DCregulatorsareprotectedfromthermal
overloadbyaninternalovertemperatureshutdowncircuit.When
thePCBtemperatureneartheICcircuitreaches130°Cthecon-
verterwillshutdownimmediately.Theregulatorwillmakecontinu-
ousattemptstostartup(non-latchingmode)andresumenormal
operationautomaticallywhenthetemperaturehasdroppedbelow
thetemperaturethreshold.
Input And Output Impedance
Theimpedanceofboththepowersourceandtheloadwillinteract
withtheimpedanceoftheDC/DCregulator.Itismostimportant
tohavealowcharacteristicimpedance,bothattheinputand
output,astheregulatorshavealowenergystoragecapability.
Usecapacitorsacrosstheinputifthesourceinductanceisgreater
than4.7H.Suitableinputcapacitorsare22F-220FlowESR
ceramics.
Minimum Required External Capacitors
RequiredInputFilter
Externalinputcapacitorsarerequiredtoincreasethelifetimeofthe
internalcapacitors.LowESRceramicsshouldbeused,themini-
muminputcapacitanceisstatedbelow.
PMC8818TS
2x4.7F.
OptionalInputFilter
Tominimizeinputrippleandtoensureevenbetterstabilitymore
capacitorscanbeadded,seetablebelow.
Considerthemaxoutputpowerinagivenapplicationandchoose
sufficientcapacitorstoobtaindesiredripplelevel.Makesurethat
theextracapacitorsareplacedneartheinputpins.
Thetablebelowisjustanexamplesincetheboardlayoutalsohas
effectontheresult.
Requiredoutputfilter
Externaloutputcapacitanceisalsorequiredtoreducetheoutput
rippleandtoobtainspecifiedloadstepresponse.Itisrecom-
mendedtouselowESRpolymercapacitorsorlowESRceramic
capacitors.
Minimumrequirement:
PMC8818TS
2x150F. (low ESR polymer type).
This is the output filter used in the verification and a requirement
to meet the specification.
Outputpower
Desiredinputripple(mVp-p)
150
250
500
0-20W
2x4.7F
-----
20-40W
5x4.7F
2x4.7F
-----
40-60W
8 x 4.7F
4 x4.7F
2x 4.7F
60-80W
11x 4.7F
7x 4.7F
4x4.7F
Note:Alloutputcharacteristicsinthedatasheetaremeasuredwith4*4.7Fattheinputpins.
Maximum Capacitive Load
Whenpoweringloadswithsignificantdynamiccurrentrequirements,
thevoltageregulationattheloadcanbe
improvedbyadditionofdecouplingcapacitanceattheload.The
mosteffectivetechniqueistolocatelowESRceramiccapacitorsas
closetotheloadaspossible,usingseveralcapacitorstolowerthe
totalESR.Theseceramiccapacitorswillhandleshortdurationhigh-
frequencycomponentsofdynamicloadchanges.Inaddition,higher
valuesofcapacitors(electrolyticcapacitors)shouldbeusedto
handlethemid-frequencycomponents.Itisequallyimportanttouse
gooddesignpracticewhenconfiguringtheDCdistributionsystem.
LowresistanceandlowinductancePCBlayoutsandcablingshould
beused.Rememberthatwhenusingremotesensing,allresistance
(includingtheESR),inductanceandcapacitanceofthedistribution
systemiswithinthefeedbackloopoftheregulator.Thiscanaffect
ontheregulatorscompensationandtheresultingstabilityand
dynamicresponseperformance.
VerylowESRandhighcapacitancemustbeusedwithcare.A“rule
ofthumb”isthatthetotalcapacitancemustneverexceedtypically
500-700FifonlylowESR(<2mW)ceramiccapacitorsisused.If
morecapacitanceisneeded,acombinationoflowESRtypeand
electrolyticcapacitorsshouldbeused,otherwisethestabilitywillbe
affected.
ThePMC8000seriesregulatorcanacceptupto8mFofcapacitive
loadontheoutputatfullload.Thisgives<500F/AofIO.When
usingthatlargecapacitanceitisimportanttoconsidertheselection
ofoutputcapacitors;theresultingbehaviorisacombinationofthe
amountofcapacitanceandESR.
Operating Information
相關(guān)PDF資料
PDF描述
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PMC8518TS 功能描述:DC/DC轉(zhuǎn)換器 .75-5.5 Vdc 10A Iso Input 8.3-16V 50W RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
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PMC85XP 制造商:NXP Semiconductors 功能描述:MOSFET P-CH 30V SOT1118 制造商:NXP Semiconductors 功能描述:MOSFET, P-CH, 30V, SOT1118 制造商:NXP Semiconductors 功能描述:MOSFET, P-CH, 30V, SOT1118; Transistor Polarity:P Channel; Continuous Drain Current Id:-3.4A; Drain Source Voltage Vds:-30V; On Resistance Rds(on):0.085ohm; Rds(on) Test Voltage Vgs:-4.5V; Threshold Voltage Vgs Typ:-780mV ;RoHS Compliant: Yes
PMC85XP,115 制造商:NXP Semiconductors 功能描述:P-Channel MOSFET with Biased NPN transistor 6-Pin HUSON EP T/R 制造商:NXP Semiconductors 功能描述:PMC85XP/HUSON6/REEL7// - Tape and Reel 制造商:NXP Semiconductors 功能描述:MOSFET P-CH 30V HUSON6 制造商:NXP Semiconductors 功能描述:30V P-channel MOSFET
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