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参数资料
型号： PMC4118LAWSN/C
厂商： ERICSSON POWER MODULES AB
元件分类： 电源模块
英文描述： 1-OUTPUT 19.2 W DC-DC REG PWR SUPPLY MODULE
封装： ROHS COMPLIANT, PACKAGE-6
文件页数： 19/31页
文件大小： 1655K
代理商： PMC4118LAWSN/C
EN/LZT146055R4A EricssonPowerModules,March2007
PMC4518TWSDatasheet
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
Input And Output Impedance
Theimpedanceofboththepowersourceandtheloadwill
interactwiththeimpedanceoftheDC/DCregulator.Itis
mostimportanttohavealowcharacteristicimpedance,
bothattheinputandoutput,astheregulatorshavealow
energystoragecapability.Usecapacitorsacrosstheinputif
thesourceinductanceisgreaterthan4.7H.Suitableinput
capacitorsare22F-220FlowESRceramics.
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
Current Limit Protection
ThePMC4000SeriesDC/DCregulatorsincludecurrent
limitingcircuitrythatallowsthemtowithstandcontinuous
overloadsorshortcircuitconditionsontheoutput.Thecur-
rentlimitisofhick-upmodetype.
Theregulatorwillresumenormaloperationafterremoval
oftheoverload.Theloaddistributionsystemshouldbe
designedtocarrythemaximumoutputshortcircuitcurrent
specified.
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.
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.
ThePMC4000seriesregulatorcanacceptupto8mFof
capacitiveloadontheoutputatfullload.Thisgives<500
F/AofIO.Whenusingthatlargecapacitanceitisimportant
toconsidertheselectionofoutputcapacitors;theresulting
behaviorisacombinationoftheamountofcapacitanceand
ESR.
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相关代理商/技术参数
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PMC4118NAWS 制造商:Ericsson 功能描述:- Trays
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PMC4318TWS 功能描述:DC/DC转换器 .75-3.6 Vdc 10A Iso Input 3.0-5.5V 33W RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
PMC4318TWSOP 制造商:Ericsson 功能描述:NON-ISOLATED, SURFACE MOUNT, REGULATORS - Tape and Reel
PMC4518TWS 功能描述:DC/DC转换器 .75-3.6 Vdc 16A Iso Input 3.0-5.5V 53W RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
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