Crane Aerospace & Electronics Power Solutions
FMSA/FMGA EMI Input Filters
28 VOLT INPUT – 0.8 AMP
F
EATURES
• –55°C to +125°C operation
• 50 dB min. attenuation at 500 kHz
differential mode
• 45 dB min. attenuation at 5MHz
common mode
• Compliant to MIL-STD-461C, CE03
• Compatible with MIL-STD-704E
DC power bus
• Compatible with MIL-STD-704A
through E (FMGA)
MODEL
FMSA-461
FMGA-461
0.8 amp
0.8 amp
FMSA SERIES™ EMI FILTER
The FMSA-461 EMI filter modules have been designed as a
companion for Interpoint MSA flyback power converters. Multiple
MSA power converters can be operated from a single filter provided
the total power line current does not exceed the filter maximum
rating. 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 Figures 4 and 5.
The FMSA is fabricated using thick film hybrid technology and is
sealed in a metal package for military, aerospace and other appli-
cations requiring EMI suppression. The filter uses only ceramic
capacitors for reliable high temperature operation.
comply with CE03. For MHF, MHF+, MHD, 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 uncondi-
tionally stable operation. A capacitor across the filter output termi-
nals of greater than 4μF or the optional damping circuit shown on
the connection diagram will be adequate for stable operation. No
capacitor is required for MSA, or DCH models.
O
PTIONAL
D
AMPING
C
IRCUIT
The optional damping circuit (Figure 2) can be used to prevent filter
overshoot caused by MIL-STD-704A 80 V, or other, transients
having rise times of less than 200 μSec. This damping can be alter-
nately provided with a 1.50 Ω resistor in series with the filter positive
input where the additional line loss can be tolerated. For transients
with rise times of greater than 200 μsec, there is no overshoot and
the damping circuit is not required.
O
PERATION
The MSA power converter has an internal 2 μF capacitor across its
input power terminals. 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, MHF+, MHE, MHD, and DCH series) to
L
AYOUT
R
EQUIREMENTS
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
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • electronics@craneae.com
www.craneae.com
Page 1 of 14
Rev D - 20060508
Crane Aerospace & Electronics Power Solutions
FMSA/FMGA EMI Input Filters
28 VOLT INPUT – 0.8 AMP
FMGA SERIES™ EMI FILTER
Interpoint’s surface mount FMGA-461™ EMI filter has been
designed to work with Interpoint’s surface mount MGA and MGH
Series DC/DC converters. Multiple MGA or MGH Series converters
can be operated from a single FMGA filter provided the total power
line current does not exceed the filter’s maximum 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 Figures
4 through 7. The filter uses only ceramic capacitors for reliable high-
temperature operation.
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.
S
URFACE
M
OUNT
P
ACKAGE
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 tempera-
ture 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. See case B for dimensions and options.
C
ONNECTION AND
O
PERATION
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 its input terminals
and the MGH Series has an internal 0.47 μF capacitor across its
input power terminals. 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.
L
AYOUT
R
EQUIREMENTS
T
RANSIENT
D
AMPING
The optional damping circuit shown in Figure 2 will prevent filter
overshoot caused by 80 V transients with rise times of less than 200
The case of the filter must be connected to the case of the converter
through a low impedance connection to minimize EMI.
0.65
Positive
Input
20
6800 pF
500 V
>285 H
6 H
6 H
Positive
Output
x2
0.014 F / 500 V
2 F
20
Input
Common
6800 pF
500 V
2 F
x2
0.014 F / 500 V
Output
Common
0.014 F / 500 V
FMGA-461
The case ground connection between the filter and the converter should be as low an impedance as possible
to minimize EMI. Direct contact of baseplate to chassis ground provides the lowest impedance.
F
IGURE
1: FMGA T
YPICAL
S
CHEMATIC
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Page 2 of 14
Rev D - 20060508
Crane Aerospace & Electronics Power Solutions
FMSA/FMGA EMI Input Filters
28 VOLT INPUT – 0.8 AMP
D
AMPING
C
IRCUITS
FMSA-461
Positive
Input
Positive
Output
C
Case
Ground
Input
Common
Output
Common
R
DC/DC Converter
Positive
Input
Case
Ground
Input
Common
Output
Common
Positive
Output
RL
The RC output is an optional
damping circuit. It is recommended in
applications where 80 volt line
transients may occur with rise times
<200 s. See text page one
"Connection and Operation."
C = 10 F, 100V –
C =
Sprague 109D106X9100C2
R = 2.2 , 5%, 1/4 W, Carbon comp.
Multiple units
allowed up to
rated output current.
RL
F
IGURE
2: FMSA D
AMPING
C
IRCUIT
FMGA-461
Positive
Input
Positive
Output
C
Case
Ground
Input
Common
Output
Common
R
DC/DC Converter
Positive
Input
Case
Ground
Input
Common
Output
Common
Positive
Output
RL
The RC output is an optional
damping circuit. It is recommended in
applications where 80 volt line
transients may occur with rise times
<200 s. See text page one
"Connection and Operation."
C = 10 F, 100V –
C =
Sprague 109D106X9100C2
R = 2.2 , 5%, 1/4 W, Carbon comp.
Multiple units
allowed up to
rated output current.
RL
F
IGURE
3: FMGA D
AMPING
C
IRCUIT
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Page 3 of 14
Rev D - 20060508
Crane Aerospace & Electronics Power Solutions
FMSA/FMGA EMI Input Filters
28 VOLT INPUT – 0.8 AMP
OPERATING CONDITIONS AND CHARACTERISTICS
Input Voltage Range
• 0 to 50 VDC continuous FMSA models
16 to 40 VDC continuous FMGA models
• 80 V for 100 ms transient
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
Case Operating Temperature (Tc)
• –55°C to +125°C full power
Derating Input/Output Current
• Derate linearly from 100% at 100°C to 0.60
amps at 125°C case. Above 125°C derate to 0%.
Capacitance
• 0.045 μF max, any pin to case
Isolation
• 100 megohm minimum at 500 V
• Any pin to case, except case pin
MECHANICAL AND ENVIRONMENTAL
Size (maximum)
FMSA models 0.980 x 0.805 x 0.270 (24.89 x 20.45 x 6.86 mm)
See case A1 for dimensions.
FMGA models 1.010 x 0.880 x 0.250 inches (25.65 x 22.35 x 6.35 mm)
Shown with “gull wing” lead option, also available with straight
leads. See case B for dimensions and options.
Weight (maximum)
10.3 grams typical, 11.5 grams maximum
Screening*
Standard, ES. See “883, Class H, QML Products – Element Evaluation” and
“883, Class H, QML Products – Environmental Screening” for more informa
tion.
* FMGA model has the option of Class H screening, while FMSA does not.
0.65
Positive
Input
20
6800 pF
500 V
>285 H
6 H
6 H
Positive
Output
x2
0.014 F / 500 V
2 F
20
Input
Common
6800 pF
500 V
2 F
x2
0.014 F / 500 V
Output
Common
0.014 F / 500 V
FMSA-461
The case ground connection between the filter and the converter should be as low an impedance as possible
to minimize EMI. Direct contact of baseplate to chassis ground provides the lowest impedance.
F
IGURE
4: FMSA S
CHEMATIC
– T
YPICAL
V
ALUES
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Page 4 of 14
Rev D - 20060508
Crane Aerospace & Electronics Power Solutions
FMSA/FMGA EMI Input Filters
28 VOLT INPUT – 0.8 AMP
PIN OUT FMSA MODELS
Pin
1
2, 3
4
5, 6
7
8
Designation
Positive Input
Positive Output
Case Ground
Output Common
Input Common
Case Ground
Squared corner and
dot on top of cover
indicate pin one.
1
2 3
4
BOTTOM
8
VIEW
FMSA
7
6 5
See case A1 for dimensions.
PINS NOT IN USE
FMSA:
Case ground
Connect to case ground for optimum
fitting
F
IGURE
5: FMSA P
IN
O
UT
FMGA:
Case ground (pin 5, 6, 13, 14)
Pin 3, 4, 15, 16
(pins with no connection)
Connect to case ground for optimum
fitting
Connect to case ground for optimum
fitting
PIN OUT FMGA MODELS
Pin
Description
1, 2
Positive Input
3, 4
No Connection
5, 6
Case Ground
7, 8, 9
Positive Output
10, 11, 12 Output Common
13, 14
Case Ground
15, 16
No Connection
17, 18
Input Common
To meet specified performance, all pins
must be connected except “No
Connection” pins.
1
2
3
4
5
6
7
8
9
TOP VIEW
FMGA
18
17
16
15
14
13
12
11
10
Differently colored glass bead around pin one or dimple in
header (bottom or side of case) indicates pin one.
Cover marking is oriented with pin one at the upper right corner.
See case B for dimensions and “gull-wing” lead option.
F
IGURE
6: FMGA P
IN
O
UT
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Page 5 of 14
Rev D - 20060508
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