FMGA-461_15 Datasheet, PDF (3/14 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
FMGA Series™ EMI Filter
The Interpoint surface mount FMGA-461 EMI filter has been
designed to work with Interpoint surface mount MGA Series™
and MGH Series™ dc-dc converters. Multiple MGA or MGH
converters can be operated from a single FMGA filter provided
the total power line current does not exceed the filter’s maximum
current rating. The FMGA filter will reduce the converter’s power
line reflected ripple current to within the limit of MIL-STD-461C,
Method CE03 as shown in Figure 10 through Figure 14 on page
10. The filter uses only ceramic capacitors for reliable high-
temperature operation.
Connection and Operation
Where more than one pin has the same designation (e.g. pins
7, 8, and 9 are Positive Output), all of those pins must be
connected for output performance to meet the specifications.
The MGA Series has an internal 2 µF capacitor on its input
terminals and the MGH Series has an internal 0.47 µF capacitor
across its input power terminals. See Figure 3 on page 4.
When the MGA or MGH converters are used with the FMGA filter,
this capacitor becomes part of the filter and forms its final LC
output section. When 2 or 3 MGA or MGH converters are used
with a single filter, this capacitor becomes larger, improving the
rejection versus frequency.
Surface Mount Package
The FMGA EMI filter can be surface mounted with pick-and-
place equipment or manually. It is recommended that the case
be attached with flexible epoxy adhesive or silicone which is
thermally conductive (>1 watt /meter/°K).
Internal components are soldered with SN96 (melting
temperature 221°C) to prevent damage during reflow. Maximum
reflow temperature for surface mounting the FMGA filter is
220°C for a maximum of 30 seconds. SN60, 62, or 63 are the
recommended types of solder. Hand soldering should not exceed
300°C for 10 seconds per pin.
The hermetically sealed metal cases are available in two different
lead configurations. For case dimensions and options, see
Case B ,Figure 16 on page 12 and the solder pad layout of
Figure 17 on page 12.
Layout Requirements
The case of the filter must be connected to the case of the
converter through a low impedance connection to minimize EMI.
Transient Damping
The optional damping circuit shown in Figure 4 on page 4
will prevent ­filter overshoot caused by 80 volt transients with rise
times of less than 200 microseconds. The damping circuit can be
used 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.
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FMSA/FMGA Rev AA - 2015.12.15