FMGA-461_15 Datasheet, PDF (1/14 Pages) Interpoint Corporation Company – FMSA/FMGA EMI Input Filters 28 Volt Input - 0.8 AMP

Crane Aerospace & Electronics Power Solutions
FMSA/FMGA EMI Input Filters
28 Volt Input - 0.8 AMP
Features
• Attenuation
50 dB (FMSA) at 500 kHz
55 dB (FMGA) at 500 kHz
• Small footprint
FMSA 0.79 in² (5.1 cm²)
FMGA 0.89 in² (5.7 cm²)
• Operating temperature -55° to +125°C
• Nominal 28 volts input, 0 to 50 volts operation
• Up to 0.8 amps throughput current
• Compliant to MIL-STD-461C CE-03
• Compatible with MIL-STD-704 A-E 28 VDC power bus
models
Throughput Current (A)
FMSA-461
0.8
FMGA-461
0.8
FMSA Series™ EMI Filter
The Interpoint® FMSA-461 EMI filter modules have been
designed as a companion for Interpoint MSA Series™ flyback
dc -dc power converters. Multiple MSA power converters can be
operated from a single filter provided the total power line current
does not exceed the maximum current rating of the filter. The
FMSA filter will reduce the MSA’s power line reflected ripple
current to within the limit of MIL-STD-461C, Method CE03, as
shown in the example of Figure 8 on page 9.
The FMSA is fabricated using thick film hybrid technol­ogy and
is sealed in a metal package for military, aerospace and other
applications requiring EMI suppression. See case A1, Figure 15
on page 11 for dimensions. The filter uses only ceramic
capacitors for reliable high temperature operation.
Operation
The MSA power converter has an internal 2 µF capacitor across
its input power terminals. See Figure 1 on page 2. When the
MSA and FMSA filters are used together, this capacitor becomes
part of the filter and forms its final LC output section. When 2 or
3 MSAs are used with a single filter, this capacitor becomes 4 µF
or 6 µF respectively, rather than 2 µF, improving the rejection vs.
frequency.
The FMSA filter can also be used with other types of Interpoint
power converters (MHF Series™, MHF+ Series™ and MHE
Series™) to comply with CE03. For MHF, MHF+ and MHE
models, the converter has an LC type line filter such that an
inductor is seen looking into its positive input terminal. For
these converters, it is necessary to terminate the filter with a
capacitor to insure unconditionally stable operation. A capacitor
across the ­filter output terminals of greater than 4 µF or the
optional damping circuit shown on the connection diagram will
be adequate for stable operation. No capacitor is required for the
MSA Series models.
Optional Damping Circuit
The optional damping circuit (Figure 2 on page 2) can be
used to prevent ­filter overshoot caused by MIL-STD-704A 80
volt, or other, transients having rise times of less than 200
microseconds. This damping can be alternately provided with a
1.50 Ω resistor in series with the filter’s positive input where the
additional line loss can be tolerated. For transients with rise times
of greater than 200 microseconds, there is no overshoot and the
damping circuit is not required.
Layout Requirements
The case of the filter must be connected to the case of the
converter through a low impedance connection to minimize EMI.
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
[phone] • [e-mail]
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FMSA/FMGA Rev AA - 2015.12.15