High Reliability EMI Filter: MQME-28E-P

The MQHE-28-P is a high reliability, multi-stage differential-mode and common-mode passive EMI filter designed to interface a power source with one or more SynQor DC/DC converters (or other loads that create EMI). Each stage of this EMI filter is well damped to avoid resonances and oscillations, and only X7R multi-layer ceramic capacitors are used. The MQHE-28-P EMI filter includes a large bulk capacitor (also X7R) with a series damping resistor to correct for the unstabilizing effect of a converter's negative input resistance.. The MQHE-28-P EMI filter 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 MQHL-28 DC/DC converter.

When used with SynQor's DC/DC converters, the MQHE-28-P EMI filter is designed to pass all of the relevant MIL-STD-461C/ D/E requirements to their most stringent limits. 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.

Features:

• 20A output current
• Very low DC resistance
• > 80dB differential-mode attenuation at 500kHz
• > 60dB common-mode attenuation at 500kHz
• Stabilizing bulk capacitor and damping resistor included
• All capacitors are X7R multi-layer ceramic
• Designed to meet all MIL-STD 461 EMI and most RTCA/ D0-160E Section 22 lightning requirements