參數(shù)資料
型號： PMB8511P
廠商： ERICSSON POWER MODULES AB
元件分類： 電源模塊
英文描述： 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT, PACKAGE-10
文件頁數(shù)： 22/32頁
文件大?。?/td> 1554K
代理商： PMB8511P
EN/LZT146065R2A EricssonPowerModules,April2007
PMB8518TPDatasheet
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
H.Suitableinput
capacitorsare22
F-220FlowESRceramics.
Minimum Required External Capacitors
RequiredInputFilter
Externalinputcapacitorsarerequiredtoincreasethelife-
timeoftheinternalcapacitors.LowESRceramicsshouldbe
used,theminimuminputcapacitanceisstatedbelow.
PMB8518TP
1x4.7
F
OptionalInputFilter
Tominimizeinputrippleandtoensureevenbetterstability
morecapacitorscanbeadded,seetablebelow.
Considerthemaxoutputpowerinagivenapplicationand
choosesufficientcapacitorstoobtaindesiredripplelevel.
Makesurethattheextracapacitorsareplacedneartheinput
pins.Thetablebelowisjustanexamplesincetheboard
layoutalsohaseffectontheresult.
Requiredoutputfilter
Externaloutputcapacitanceisalsorequiredtoreducethe
outputrippleandtoobtainspecifiedloadstepresponse.It
isrecommendedtouselowESRpolymercapacitorsorlow
ESRceramiccapacitors.
Minimumrequirement:
PMB8518TP
2x150
F(low ESR polymer type).
This is the output filter used in the verification and a require-
ment to meet the specification.
Outputpower
Desiredinputripple(mVp-p)
150
250
500
0-20W
2x4.7F
-----
20-40W
5x4.7F
2x4.7F
-----
40-50W
8 x 4.7F
4x 4.7F
2 x 4.7F
Note:Alloutputcharacteristicsinthedatasheetaremeasuredwith4*4.7Fattheinputpins.
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
FifonlylowESR(<2m)
ceramiccapacitorsareused.Ifmorecapacitanceisneeded,
acombinationoflowESRtypeandelectrolyticcapacitors
shouldbeused,otherwisethestabilitywillbeaffected.
Operating Information
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