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參數(shù)資料
| 型號(hào)： | PMB4118LWP |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, PACKAGE-10 |
| 文件頁數(shù)： | 18/29頁 |
| 文件大?。?/td> | 1387K |
| 代理商： | PMB4118LWP |
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EN/LZT146048R4A EricssonPowerModules,March2007
PMB4418TWPDatasheet
Operating Information
Output Voltage Adjust (Vadj)
Theoutputvoltagecanbesetbymeansofanexternal
resistor,connectedtotheVadjpin.Nominaloutputvoltage
0.75VissetbyleavingtheVadjpinopen.Adjustmentcan
onlybemadetoincreasetheoutputvoltagesetting.
Toincrease:
Connectaresistorbetween(Vadj)and(Gnd).Theoutput
voltageincreaseswithdecreasingresistorvalueasshown
inthetablebelow.Notethatthemaximumoutputvoltage
3.63Vmaynotbeexceeded.
Rextup(kohm)=(21.007/(VO-0.75225))-5.1
Circuitconfigurationforoutputvoltageadjust
Increase
+Out
GND
Vadj
Load
Radj
Sense
OutputVoltage(V)
Resistor(ohm)
0.75
Open
1.0
79.691k
1.2
41.817k
1.5
22.990k
1.8
14.949k
2.5
6.919k
3.3
3.145k
Current Limit Protection
ThePMB4000SeriesDC/DCregulatorsincludecurrent
limitingcircuitrythatallowsthemtowithstandcontinuous
overloadsorshortcircuitconditionsontheoutput.Thecur-
rentlimitisofhick-upmodetype.
Theregulatorwillresumenormaloperationafterremoval
oftheoverload.Theloaddistributionsystemshouldbe
designedtocarrythemaximumoutputshortcircuitcurrent
specified.
Input And Output Impedance
Theimpedanceofboththepowersourceandtheloadwill
interactwiththeimpedanceoftheDC/DCregulator.Itis
mostimportanttohavealowcharacteristicimpedance,
bothattheinputandoutput,astheregulatorshavealow
energystoragecapability.Usecapacitorsacrosstheinputif
thesourceinductanceisgreaterthan4.7H.Suitableinput
capacitorsare22F-220FlowESRceramics.
Maximum Capacitive Load
Whenpoweringloadswithsignificantdynamiccurrentre-
quirements,thevoltageregulationattheloadcanbe
improvedbyadditionofdecouplingcapacitanceattheload.
ThemosteffectivetechniqueistolocatelowESRceramic
capacitorsasclosetotheloadaspossible,usingseveral
capacitorstolowerthetotalESR.Theseceramiccapacitors
willhandleshortdurationhigh-frequencycomponentsof
dynamicloadchanges.Inaddition,highervaluesofcapaci-
tors(electrolyticcapacitors)shouldbeusedtohandlethe
mid-frequencycomponents.Itisequallyimportanttouse
gooddesignpracticewhenconfiguringtheDCdistribution
system.
LowresistanceandlowinductancePCBlayoutsandca-
blingshouldbeused.Rememberthatwhenusingremote
sensing,allresistance(includingtheESR),inductanceand
capacitanceofthedistributionsystemiswithinthefeedback
loopoftheregulator.Thiscanaffectontheregulatorscom-
pensationandtheresultingstabilityanddynamicresponse
performance.
VerylowESRandhighcapacitancemustbeusedwithcare.
A“ruleofthumb”isthatthetotalcapacitancemustnever
exceedtypically500-700FifonlylowESR(<2m
)ce-
ramiccapacitorsareused.Ifmorecapacitanceisneeded,
acombinationoflowESRtypeandelectrolyticcapacitors
shouldbeused,otherwisethestabilitywillbeaffected.
ThePMB4000seriesregulatorcanacceptupto5mFof
capacitiveloadontheoutputatfullload.Thisgives<500
F/AofIO.Whenusingthatlargecapacitanceitisimportant
toconsidertheselectionofoutputcapacitors;theresulting
behaviorisacombinationoftheamountofcapacitanceand
ESR.
Minimum Required External Capacitors
Externalinputcapacitorsarerequiredtoincreasethe
lifetimeoftheinternalcapacitorsandtofurtherreducethe
inputripple.Aminimumof44F external input capacitance
F external input capacitance
Fexternalinputcapacitance
withlowESRshouldbeadded.
Aminimumof150F external output capacitance , low
F external output capacitance , low
Fexternaloutputcapacitance,low
ESR,shouldbeaddedfortheconvertertooperateproperly
atfullload.
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| PMB4118LWPM | 制造商:Ericsson 功能描述:POL DOSA COMPATIBLE 12V 10A |
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| PMB4118NWP | 制造商:Ericsson 功能描述:- Trays |
| PMB4219WPM | 制造商:Ericsson 功能描述:POL DOSA COMPATIBLE |
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