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MGH2805SZ/883 Datasheet(PDF) 1 Page - Interpoint Corporation Company |
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MGH2805SZ/883 Datasheet(HTML) 1 Page - Interpoint Corporation Company |
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1 / 13 page  Features small footprint, 0.79 in2 (5.1 cm2) - MCH surface mount package - MGH • Operatingtemperature-55°Cto+125°C • Inputvoltage12to50VDC • Transientprotection80Vforupto120ms - 70Vfor15Vsingleanddualmodels • Fullyisolated,magneticfeedback • Fixedfrequencyswitching • Inhibitfunction • Shortcircuitprotection • Undervoltagelockout • Upto79%efficiency DesCrIPtION TheInterpoint™MCHSeries™andMGHSeries™ofdc-dc convertersdeliver1.5wattsofoutputpowerwhilesaving significantboardrealestate.Thewideinputvoltagerangeof12 to50VDCacceptsthevaryingvoltagesofmilitary,aerospace,or spacebuspowerandtightlyregulatesoutputvoltagestoprotect downstreamcomponents.Transientprotectionof80voltsforup to120millisecondsexceedstherequirementsofMIL-STD-704A forthe5and12voltsinglemodelsandthe12voltdualmodel. The15voltsingleanddualconverterswillwithstandtransientsof upto70voltsforupto120milliseconds. Theconvertersareofferedwithstandardscreening,“ES” screening,orfullycompliantto“883”MIL-PRF-38534ClassH screening.See“Table11:ElementEvaluation”onpage12and “Table12:EnvironmentalScreening”onpage13.Standard microcircuitdrawings(SMD)areavailable.See“Table5: MCHSMDNumbers”onpage4and“Table6:MGHSMD Numbers”onpage4. Converter Design MCHSeriesandMGHSeriesofdc-dcconvertersincorporatea continuousflybacktopologywithaconstantswitchingfrequency ofapproximately370kHz.Current-modepulsewidthmodulation (PWM)providesoutputvoltageregulation.Outputerrorvoltage ismagneticallyfedbacktotheinputsideofthePWMtoregulate outputvoltage.Regulationisalsoaffectedbytheload;refer totheElectricalCharacteristicsTable9onpage6and Table10onpage7. Dualmodelsregulatethenegativeoutputwithmagneticcoupling tothepositiveoutput.Upto80%ofthetotalloadmaybeon oneoutputprovidingthattheotheroutputcarriesaminimumof 20%ofthetotalload.Thedualmodelscanbeusedatdouble theoutputvoltagebyconnectingtheloadbetweenpositiveand negativeoutputs,leavingthecommonunconnected. (ex:MCH2805Dcanbeusedasa10VDCoutput.) inhibit FunCtion MCHandMGHconvertersprovideaninhibitterminalthatcanbe usedtodisableinternalswitching,resultinginnooutputvoltage andaninputcurrentaslowas2.3mA.Theconverterisinhibited whentheinhibitpinispulledbelow0.8Vandenabledwhenits inhibitpinisleftfloating.Anexternalinhibitinterfaceshouldbe capableofpullingtheconverter’sinhibitpinbelow0.8Vwhile sinkingthemaximuminhibitcurrentandalsoallowingtheinhibit pintofloathightoenabletheconverter.Avoltageshouldnotbe appliedtotheinhibitpin.Theopencircuitvoltagepresentonthe inhibitpinis7to12V. ProteCtion Features Undervoltagelockoutpreventstheconvertersfromoperating belowapproximately8VDCinputvoltagetokeepsystem currentlevelssmooth,especiallyduringinitializationorre-start operations.Allmodelsincludeasoft-startfunctiontoprevent largecurrentdrawandminimizeovershoot.Theconvertersalso provideshortcircuitprotectionbyrestrictingthecurrent. MiL-stD-461 UsetheInterpointFMSA-461(down-leaded)orFMGA-461 (surfacemount,side-leaded)EMIfilterstopasstheCE03 requirementsofMIL-STD-461C. MODels VDC Output SINGLE DUAL 5 ±5 12 ±12 15 ±15 Crane Aerospace & Electronics Power Solutions MCH/MGH Single and Dual DC-DC Converters Crane Aerospace & Electronics Power Solutions – Interpoint Products 10301 Willows Rd. NE, Redmond, WA 98052 +1.425.882.3100 • power@crane-eg.com www.craneae.com/interpoint Page1of13 MCH_MGHRevAB-2013.05.31 28 Volt input – 1.5 Watt |
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