Meets MIL-STD-461D,E,F,G CE102 Requirements
MDI model *3678 Hybrid EMI Filters upgrade legacy converters with internal MIL-STD-461C CE03 EMI filters to meet the latest MIL-STD-461D,E,F,G test method requirements.
MDI introduced the industry’s first hybrid DC-DC converters featuring built-in MIL-STD-461C CE03 EMI filters. 461C CE03 is a recognized EMI specification in widespread use that uses feed-through capacitors and a current probe to measure conducted emissions on power lines in dBµA units.
More recent test methods of MIL-STD-461D,E,F, G CE102 measure conducted emissions in voltage mode using a line impedance stabilization network referenced to a 50 ohm impedance in dBµV units. Also, after adjusting for a 34dB measurement differential, CE102 uses a newer slope-adjusted limit curve as compared to CE03. In the frequency range of 100-400kHz, where many hybrid DC-DC converters operate, the newer CE102 limits can be up to 24dB lower than corresponding CE03 limits.
MDI offers the model *3678, a compact standalone, low attenuation solution that permits users to meet newer MIL-STD-461D,E,F,G CE102 limits with legacy converters having built-in 461C CE03 filters.
The *3678 family of filters, sized to accommodate a broad range of popular satellite, ISS/Orion, airframe and vehicle input voltage buses, incorporate a common mode stage and two low attenuation, low resonance differential mode stages. The resulting design achieves the necessary attenuation for CE102 compliance while minimizing the possibility of excessive input filter impedance mismatch that might otherwise result in DC-DC converter loop instability.
A single filter can serve several DC-DC converters up to the rated maximums and two or more *3678 filters may be used in parallel to serve multiple DC-DC converters sharing the same input bus. Please see our application notes for insertion loss curves and full technical details.
ble in all popular bus voltages
