FMD28-461_14 Datasheet, PDF (1/8 Pages) Interpoint Corporation Company – EMI Input Filters 28 Volt input – 7 Amp

Crane Aerospace & Electronics Power Solutions
FMD28-461 EMI Input Filters
28 Volt input – 7 Amp
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
Description
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.
Place the filter as close as possible to the converter for optimum
performance. The baseplates of the filter and the converter
should be connected with the shortest and widest possible
conductors. See “Figure 2: Connection Diagram” on page 2.
Transients
A transient of 100 V for up to 100 ms with a 0.5 ohm source
impedance will not damage the filter.
Operation over Temperature
The FMD28-461 Series filters are rated for full power operation
from -55°C to +125°C case temperature. Current is derated
linearly to zero at +135°C case temperature.
Insertion Loss
The maximum dc insertion loss at full load and nominal input
voltage represents a power loss of less than 1.3%.
Packaging
FMD28-461 filters are sealed in metal hermetic, down-leaded
packages, “Figure 6: Case J4 - FMD28-461” on page 6. Also
available in a side-leaded package, “Figure 7: Case U - FMD28-
461SL” on page 7.
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Road NE, Redmond, WA 98052
+1.425.882.3100 • [e-mail]
www.craneae.com/interpoint
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FMD28 Rev AA - 2014.02.06