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MQME-28E-P-X-B Datasheet(PDF) 6 Page - SynQor Worldwide Headquarters |
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MQME-28E-P-X-B Datasheet(HTML) 6 Page - SynQor Worldwide Headquarters |
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6 / 13 page  Product # MQME-28E-P Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005135 Rev. A 03/18/09 Page 6 MQME-28E-P Current: 20A Technical Specification BASICOPERATIONANDFEATURES TheMQME-28E-Pisamulti-stagedifferential-modeandcommon- mode passive EMI filter designed to interface a power source with one or more SynQor DC/DC converters (or other loads that create EMI).Eachstageofthisfilteriswelldampedtoavoidresonances andoscillations,andonlyX7Rmulti-layerceramiccapacitorsare used.Figure1showsthetypicaldifferentialandcommon-mode attenuation provided by this filter when the source impedance is 50Ω to chassis ground on each input line. TheMQME-28E-PEMIfilterincludesalargebulkcapacitor(also X7R)withaseriesdampingresistortocorrectfortheunstabilizing effect of a converter’s negative input resistance. A white paper discussing this negative input resistance and the need for corrective damping can be found on the SynQor website (see Input System Instabilityapplicationnote).Figure2showsthemagnitudeofthe filter’s output impedance when the filter input is connected to a stiff voltage source. The input voltage surge and spike compliance matrix shown on Page 8 displays the worst case requirements listed in various 28VMilitary(VehicleandAircraft)andCivilAircraftstandards. The MQME-28E-P EMIfilter is designed to handle all of the short duration voltage spike requirements of these standards (with certain assumptions regarding DEF-STAN 61-5). Some of the long duration voltage surge requirements remain within the 50V maximum transient rating of a SynQor MQFL-28 DC/DC converter.Theothersrequirethetransientsuppressioncircuitryof an MQME-28-T EMIfilter to protect the converter from an over- voltage condition. If MQFL-28E or MQFL-28VE converters are used,voltagesurgesashighas80Vcanbetoleratedwithoutthe need for this transient suppression circuitry. WhenusedwithSynQor’sDC/DCconverters,theMQME-28E-P EMIfilterisdesignedtopassalloftherelevantMIL-STD-461C/ D/Erequirementstotheirmoststringentlimits.TheMIL-STD-461 ComplianceMatrixTableonPage7liststheserequirementsand describesthesetupusedtopassthem.Figures3-6showresults from selected conductive and radiated emissions tests. The filter is also designed to pass the waveform types and applications specified in RTCA/DO-160E Section 22 (Lightning Induced Transient Susceptibility) to Level 4 (some waveforms/ applications require the MQME-28-T filter and/or external transient suppression circuitry).The Section 22 Compliance Matrix Table on Page 9 lists these waveforms and applications and describes the setup used to pass them. A typical application would place the MilQor filter close to the input of the DC/DC converter, with the cases of the filter and theconverterconnectedtogetherthroughagroundplane.Both cases are electrically conductive, so connection to the cases can be made with the fasteners used to secure the device. Do not connect the outputs of multiple MQME-28E-P filters in parallel. Connecting filters in this manner may result in slightly unequalcurrentstoflowinthepositiveandreturnpathsofeach filter. These unequal currents may cause the internal common- mode chokes to saturate and thus cause degraded common-mode rejection performance. |
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