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参数资料
| 型号： | PMC8818TSN |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 80 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, PACKAGE-6 |
| 文件页数： | 24/34页 |
| 文件大小： | 1756K |
| 代理商： | PMC8818TSN |
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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
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