Operating Information
Remote Control (RC)
EMC Specification
Layout Recommendation
TheꢀradiatedꢀEMIꢀperformanceꢀofꢀtheꢀDC/DCꢀregulatorꢀwillꢀbeꢀ
optimisedꢀbyꢀincludingꢀaꢀgroundꢀplaneꢀinꢀtheꢀPCBꢀareaꢀunderꢀ
theꢀDC/DCꢀregulator.ꢀThisꢀapproachꢀwillꢀreturnꢀswitchingꢀ
noiseꢀtoꢀgroundꢀasꢀdirectlyꢀasꢀpossible,ꢀwithꢀimprovementsꢀ
toꢀbothꢀemissionꢀandꢀsusceptibility.
TheꢀRCꢀpinꢀmayꢀbeꢀusedꢀtoꢀturnꢀonꢀorꢀturnꢀoffꢀtheꢀregulatorꢀ
usingꢀaꢀsuitableꢀopenꢀcollectorꢀfunction.ꢀ
TurnꢀoffꢀisꢀachievedꢀbyꢀconnectingꢀtheꢀRCꢀpinꢀtoꢀtheꢀinputꢀ
voltage.ꢀꢀ
TheꢀregulatorꢀwillꢀrunꢀinꢀnormalꢀoperationꢀwhenꢀtheꢀRCꢀpinꢀisꢀ
leftꢀopen.ꢀ
-FWFM ꢇ < E#¬">
ꢁꢂꢂ
Regulatorꢀ
condition
RC
min
1.7
typ
max
5.5
Unit
V
ꢆꢂ
ꢅꢂ
Highꢀlevelꢀ
OFF
referencedꢀtoꢀGND
Open
ON
ꢀ
ꢄꢂ
ꢀ
ꢃꢂ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
V
i
ꢂ
ꢀ ꢁꢂ
ꢁꢈꢂL ꢉꢂꢂL ꢈꢂꢂL
ꢁ.
ꢃ. ꢉ. ꢄ. ꢅ.
ꢁꢂ.
ꢉꢂ.
ꢇ
V
i
'S FRVFODZꢇ < )[>
RC
Module
GND
Remote Sense
AllꢀPMBꢀ4000ꢀSeriesꢀDC/DCꢀregulatorsꢀhaveꢀaꢀpositiveꢀre-
moteꢀsenseꢀpinꢀthatꢀcanꢀbeꢀusedꢀtoꢀcompensateꢀforꢀmoder-
ateꢀamountsꢀofꢀresistanceꢀinꢀtheꢀdistributionꢀsystemꢀandꢀal-
lowꢀforꢀvoltageꢀregulationꢀatꢀtheꢀloadꢀorꢀotherꢀselectedꢀpoint.ꢀ
Theꢀremoteꢀsenseꢀlineꢀwillꢀcarryꢀveryꢀlittleꢀcurrentꢀandꢀdoesꢀ
notꢀneedꢀaꢀlargeꢀcrossꢀsectionalꢀarea.ꢀHowever,ꢀtheꢀsenseꢀ
lineꢀonꢀtheꢀPCBꢀshouldꢀbeꢀlocatedꢀcloseꢀtoꢀaꢀgroundꢀtraceꢀorꢀ
groundꢀplane.ꢀTheꢀremoteꢀsenseꢀcircuitryꢀwillꢀcompensateꢀforꢀ
upꢀtoꢀ10%ꢀvoltageꢀdropꢀbetweenꢀtheꢀsenseꢀvoltageꢀandꢀtheꢀ
voltageꢀatꢀtheꢀoutputꢀpinsꢀfromꢀVOnom.ꢀIfꢀtheꢀremoteꢀsenseꢀisꢀ
notꢀneededꢀtheꢀsenseꢀpinꢀshouldꢀbeꢀleftꢀopen.
ꢀꢂ
ꢀꢀꢀꢀꢀꢀEN/LZTꢀ146ꢀ049ꢀR4Aꢀ©EricssonꢀPowerꢀModules,ꢀMarchꢀ2007
PMBꢀ4518TꢀWPꢀDatasheet
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