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参数资料
| 型号： | PMB8218GP |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-10 |
| 文件页数： | 22/32页 |
| 文件大小： | 1551K |
| 代理商： | PMB8218GP |
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EN/LZT146066R2A EricssonPowerModules,April2007
PMB8818TPDatasheet
OptionalInputFilter
Tominimizeinputrippleandtoensureevenbetterstability
morecapacitorscanbeadded,seetablebelow.
Considerthemaxoutputpowerinagivenapplicationand
choosesufficientcapacitorstoobtaindesiredripplelevel.
Makesurethattheextracapacitorsareplacedneartheinput
pins.Thetablebelowisjustanexamplesincetheboard
layoutalsohaseffectontheresult.
Requiredoutputfilter
Externaloutputcapacitanceisalsorequiredtoreducethe
outputrippleandtoobtainspecifiedloadstepresponse.It
isrecommendedtouselowESRpolymercapacitorsorlow
ESRceramiccapacitors.
Minimumrequirement:
PMB8818TP
2x150F.(low ESR polymer type).
This is the output filter used in the verification and needed to
meet the specification.
Outputpower
Desiredinputripple(mVp-p)
150
250
500
0-20W
2x4.7F
-----
20-40W
5x4.7F
2x4.7F
-----
40-60W
8x4.7F
4x4.7F
2x4.7F
60-80W
11x4.7F
7x4.7F
4x4.7F
Note:Alloutputcharacteristicsinthedatasheetaremeasuredwith4x4.7Fattheinputpins.
AllPMB8000SeriesDC/DCregulatorshaveapositivere-
motesensepinthatcanbeusedtocompensateformoder-
ateamountsofresistanceinthedistributionsystemandal-
lowforvoltageregulationattheloadorotherselectedpoint.
Theremotesenselinewillcarryverylittlecurrentanddoes
notneedalargecrosssectionalarea.However,thesense
lineonthePCBshouldbelocatedclosetoagroundtraceor
groundplane.Theremotesensecircuitrywillcompensatefor
upto10%voltagedropbetweenthesensevoltageandthe
voltageattheoutputpinsfromVOnom.Iftheremotesenseis
notneededthesensepinshouldbeleftopenorconnected
tothepositiveoutput.
Remote Sense
Current Limit Protection
ThePMB8000SeriesDC/DCregulatorsincludecurrent
limitingcircuitrythatallowsthemtowithstandcontinuous
overloadsorshortcircuitconditionsontheoutput.Theout-
putvoltagewilldecreasetowardszeroforoutputcurrentsin
excessofmaxoutputcurrent(Iomax).Whenthecurrentlimit
isreachedtheregulatorwillgointohiccupmode.Thecur-
rentlimitistemperaturedependent,i.e.thelimitdecrease
athigheroperatingtemperature,theregulatorisguaranteed
tostartatIOmaxx1.25@Tref115°C.Theregulatorwill
resumenormaloperationafterremovaloftheoverload.The
loaddistributionsystemshouldbedesignedtocarrythe
maximumoutputshortcircuitcurrentspecified.
Over Temperature Protection (OTP)
ThePMB8000SeriesDC/DCregulatorsareprotectedfrom
thermaloverloadbyaninternalovertemperatureshutdown
circuit.WhenthePCBtemperatureneartheICcircuitreach-
es130°Ctheconverterwillshutdownimmediately.The
regulatorwillmakecontinuousattemptstostartup(non-
latchingmode)andresumenormaloperationautomatically
whenthetemperaturehasdroppedbelowthetemperature
threshold.
Input And Output Impedance
Theimpedanceofboththepowersourceandtheloadwill
interactwiththeimpedanceoftheDC/DCregulator.Itis
mostimportanttohavealowcharacteristicimpedance,
bothattheinputandoutput,astheregulatorshavealow
energystoragecapability.Usecapacitorsacrosstheinputif
thesourceinductanceisgreaterthan4.7
mH.Suitableinput
capacitorsare22
mF-220mFlowESRceramics.
Minimum Required External Capacitors
RequiredInputFilter
Externalinputcapacitorsarerequiredtoincreasethelife-
timeoftheinternalcapacitors.LowESRceramicsshouldbe
used,theminimuminputcapacitanceisstatedbelow:
PMB8818TP 2x4.7
mF
Maximum Capacitive Load
Whenpoweringloadswithsignificantdynamiccurrent
requirements,thevoltageregulationattheloadcanbe
improvedbyadditionofdecouplingcapacitanceattheload.
ThemosteffectivetechniqueistolocatelowESRceramic
capacitorsasclosetotheloadaspossible,usingseveral
capacitorstolowerthetotalESR.Theseceramiccapacitors
willhandleshortdurationhigh-frequencycomponents
ofdynamicloadchanges.Inaddition,highervaluesof
capacitors(electrolyticcapacitors)shouldbeusedtohandle
themid-frequencycomponents.Itisequallyimportant
tousegooddesignpracticewhenconfiguringtheDC
distributionsystem.
LowresistanceandlowinductancePCBlayoutsand
cablingshouldbeused.Rememberthatwhenusingremote
sensing,allresistance(includingtheESR),inductanceand
capacitanceofthedistributionsystemiswithinthefeedback
loopoftheregulator.Thiscanaffectontheregulators
compensationandtheresultingstabilityanddynamic
responseperformance.
VerylowESRandhighcapacitancemustbeusedwith
care.A“ruleofthumb”isthatthetotalcapacitancemust
neverexceedtypically500-700
mFifonlylowESR(<2m)
ceramiccapacitorsareused.Ifmorecapacitanceisneeded,
acombinationoflowESRtypeandelectrolyticcapacitors
shouldbeused,otherwisethestabilitywillbeaffected.
Operating Information
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