Description

Features
Attenuation to 50 dB at 500 kHz
• Operating temperature -55° to +125°C
• Nominal 28 V input, 0 to 50 V operation
• Transient rating to 100 V for 100 ms
• Up to 7 A throughput current
• Compliant to MIL-STD-461C, CE03
• Compatible with MIL-STD-704 A-E 28 VDC power bus

The Interpoint® FMD28 Series™ EMI filters are specifically designed to reduce the reflected input ripple current of Interpoint high frequency dc-dc converters. FMD filters minimize electromagnetic interference (EMI) for the MOR, MFL, MTR, MHV, MHF+, MHF, MTO and MHE Series of converters. These filters are intended for use in 28 volt applications which must meet MIL-STD-461C CE03 levels of conducted emissions. One filter can be used with multiple converters up to the rated output current of the filter. Input Ripple and EMI Switching dc-dc converters naturally generate two noise components on the power input line: differential noise and common mode noise. Input ripple current refers to both of these components. Differential noise occurs between the positive input and input common. Most Interpoint converters have an input filter that reduces differential noise which is sufficient for many applications. Common mode noise occurs across stray capacitances between the converter’s power train components and the baseplate (bottom of the package) of the converter. See “Figure 1: FMD28-461 Block Diagram” on page 2 Where low noise currents are required to meet CE03 of MIL-STD-461C a power line filters reduces the common mode
and differential noise generated by the converters. FMD28-461 filters reduce input ripple current by a minimum of 50 dB at 500 kHz when used in conjunction with Interpoint dc-dc converters.