Crane Aerospace & Electronics Power Solutions
MSA/MGA Single and Dual DC-DC Converters
28 Volt input – 5 Watt
Features
smꢀll ꢁizꢂ, 1.16 in2 (7.46 cm2) - Msa
sꢃꢄfꢀcꢂ moꢃnꢅ pꢀckꢀgꢂ - MGa
•ꢀ –55°ꢀtoꢀ+125°Cꢀoperation
•ꢀ 16ꢀtoꢀ40ꢀVDCꢀinput
•ꢀ 50ꢀVꢀforꢀ50ꢀmsꢀtransientꢀprotection
•ꢀ Fullyꢀisolated
MꢉDeꢋs
VDC Output
SINGLE
DUAL
±5
•ꢀ Fixedꢀhighꢀfrequencyꢀswitching
•ꢀ Inhibitꢀfunction
5
•ꢀ Indefiniteꢀshortꢀcircuitꢀprotection
•ꢀ Upꢀtoꢀ76%ꢀefficiency
5.2ꢀ(MSAꢀonly)
±12
±15
12
15
Desꢆrꢇꢈtꢇꢉꢊ
directꢀmonitoringꢀofꢀtheꢀoutputꢀloadꢀcurrent,ꢀwhichꢀresultsꢀinꢀaꢀ
constantꢀcurrentꢀoutput.ꢀInternalꢀinputꢀandꢀoutputꢀfiltersꢀeliminateꢀ
theꢀneedꢀforꢀexternalꢀcapacitorsꢀforꢀstableꢀoperation.ꢀOutputꢀfilterꢀ
examplesꢀinꢀ“Figureꢀ3:ꢀLowꢀNoiseꢀOutputꢀFilterꢀMSAꢀandꢀMGAꢀ
SingleꢀOutputꢀModels”ꢀonꢀpageꢀ3ꢀandꢀ“Figureꢀ4:ꢀLowꢀNoiseꢀ
OutputꢀFilterꢀMSAꢀandꢀMGAꢀDualꢀOutputꢀModels”ꢀonꢀpageꢀ3ꢀ
provideꢀsuggestedꢀsolutionsꢀforꢀsystemsꢀwhereꢀveryꢀlowꢀoutputꢀ
rippleꢀisꢀrequired.
TheꢀInterpoint™ꢀMSAꢀSeries™ꢀandꢀMGAꢀSeries™ꢀofꢀdc-dcꢀ
convertersꢀprovideꢀupꢀtoꢀ5ꢀwattsꢀofꢀoutputꢀpowerꢀoverꢀtheꢀfullꢀ
militaryꢀtemperatureꢀrangeꢀwithꢀupꢀtoꢀ76%ꢀefficiency.ꢀThick-filmꢀ
hybridꢀtechniquesꢀprovideꢀmilitary/aerospaceꢀreliabilityꢀlevelsꢀandꢀ
optimumꢀminiaturization.ꢀ
Theꢀconvertersꢀareꢀofferedꢀwithꢀstandardꢀscreening,ꢀ“ES”ꢀ
screening,ꢀorꢀfullyꢀcompliantꢀtoꢀ“883”ꢀMIL-PRF-38534ꢀClassꢀHꢀ
screening.ꢀStandardꢀmicrocircuitꢀdrawingsꢀ(SMD)ꢀareꢀavailable.ꢀ
Seeꢀ“Tableꢀ12:ꢀElementꢀEvaluation”ꢀonꢀpageꢀ14ꢀandꢀ“Tableꢀ13:ꢀ
EnvironmentalꢀScreening”ꢀonꢀpageꢀ15ꢀforꢀscreeningꢀoptionsꢀ
andꢀdescriptions.ꢀ
WiDe voltage range
TheꢀMSAꢀconvertersꢀareꢀdesignedꢀtoꢀprovideꢀfullꢀpowerꢀoperationꢀ
overꢀaꢀfullꢀ16ꢀtoꢀ40ꢀVDCꢀvoltageꢀrange.ꢀOperationꢀbelowꢀ16ꢀvolts,ꢀ
includingꢀMIL-STD-704Eꢀemergencyꢀpowerꢀconditionsꢀisꢀpossibleꢀ
withꢀderatedꢀpower.ꢀLow-lineꢀdropꢀoutꢀgraphs,ꢀ“Figureꢀ17”ꢀonꢀ
pageꢀ10ꢀandꢀ“Figureꢀ23”ꢀonꢀpageꢀ11,ꢀgraphsꢀprovideꢀmoreꢀ
information.ꢀ
Converter Design
Theꢀconvertersꢀareꢀswitchingꢀregulatorsꢀthatꢀuseꢀaꢀflybackꢀ
converterꢀdesignꢀwithꢀaꢀconstantꢀswitchingꢀfrequencyꢀofꢀ550ꢀkHzꢀ
typical.ꢀTheyꢀareꢀregulated,ꢀisolatedꢀunitsꢀusingꢀaꢀpulseꢀwidthꢀ
modulatedꢀtopologyꢀandꢀareꢀbuiltꢀasꢀhighꢀreliabilityꢀthick-filmꢀ
hybrids.ꢀIsolationꢀbetweenꢀinputꢀandꢀoutputꢀcircuitsꢀisꢀprovidedꢀ
withꢀaꢀtransformerꢀinꢀtheꢀforwardꢀpowerꢀpathꢀandꢀanꢀopticalꢀ
linkꢀinꢀtheꢀfeedbackꢀcontrolꢀloop.ꢀExcellentꢀinputꢀlineꢀtransientꢀ
responseꢀandꢀaudioꢀrejectionꢀisꢀachievedꢀbyꢀanꢀadvancedꢀfeed-
forwardꢀcompensationꢀtechnique.ꢀNegativeꢀoutputꢀregulationꢀisꢀ
maintainedꢀbyꢀtightlyꢀcoupledꢀmagnetics.ꢀUpꢀtoꢀ4ꢀwatts,ꢀ80%ꢀofꢀ
theꢀtotalꢀoutputꢀpower,ꢀisꢀavailableꢀfromꢀeitherꢀoutput,ꢀprovidedꢀ
thatꢀtheꢀoppositeꢀoutputꢀisꢀsimultaneouslyꢀcarryingꢀ20%ꢀofꢀtheꢀ
totalꢀpowerꢀinꢀorderꢀtoꢀmaintainꢀtheꢀspecifiedꢀregulationꢀonꢀtheꢀ
negativeꢀoutput.ꢀAꢀpredictableꢀcurrentꢀlimitꢀisꢀaccomplishedꢀbyꢀ
improveD DynamiC response
Theꢀfeed-forwardꢀcompensationꢀsystemꢀprovidesꢀexcellentꢀ
dynamicꢀresponseꢀandꢀnoiseꢀrejection.ꢀAudioꢀrejectionꢀisꢀtypicallyꢀ
50ꢀdB.ꢀTheꢀminimumꢀtoꢀmaximumꢀstepꢀlineꢀtransientꢀresponseꢀisꢀ
typicallyꢀlessꢀthanꢀ1%.
Crane Aerospace & Electronics
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MSA_MGAꢀRevꢀACꢀ-ꢀ2013.06.13
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint