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參數(shù)資料
| 型號： | PMB4218GWPP/B |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 28.8 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> | 1528K |
| 代理商： | PMB4218GWPP/B |
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EN/LZT146049R4A EricssonPowerModules,March2007
PMB4518TWPDatasheet
Input And Output Impedance
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
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
neverexceedtypically500-700FifonlylowESR(<2m
)
ceramiccapacitorsareused.Ifmorecapacitanceisneeded,
acombinationoflowESRtypeandelectrolyticcapacitors
shouldbeused,otherwisethestabilitywillbeaffected.
ThePMB4000seriesregulatorcanacceptupto8mFof
capacitiveloadontheoutputatfullload.Thisgives<500
F/AofIO.Whenusingthatlargecapacitanceitisimportant
toconsidertheselectionofoutputcapacitors;theresulting
behaviorisacombinationoftheamountofcapacitanceand
ESR.
Minimum Required External Capacitors
Externalinputcapacitorsarerequiredtoincreasethe
lifetimeoftheinternalcapacitorsandtofurtherreducethe
inputripple.Aminimumof2x22F external input capaci-
F external input capaci-
Fexternalinputcapaci-
tancewithlowESRshouldbeadded.
Aminimumof150F external output capacitance, low ESR,
F external output capacitance, low ESR,
Fexternaloutputcapacitance,lowESR,
shouldbeaddedfortheconvertertooperateproperlyatfull
load.
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