B3-25
DESCRIPTION
The FMSA-461 EMI filter module has 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.
O
PERATION
The MSA power converter has an internal 2 F 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 F or 6 F respectively, rather than 2 F,
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
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 4F 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 Sec. This damping can be alter-
nately provided with a 1.50
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 sec, there is no overshoot and
the damping circuit is not required.
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.
EMI I
NPUT
F
ILTER
28 V
OLT
I
NPUT
FMSA EMI FILTER
0.8 AMP
F
EATURES
55C to +125C operation
50 dB minimum attenuation
at 500 kHz
Compliant to MIL-STD-461C, CE03
Compatible with MIL-STD-704E
DC power bus
Size (max.): 0.975 x 0.800 x 0.270 (24.77 x 20.32 x 6.86 mm)
See Section B8, cases A1, for dimensions.
Weight:
10.3 grams typical, 11.5 grams maximum
Screening: Standard, ES, or 883 (Class H). See Section C2 for screening
options, see Section A5 for ordering information.
MODEL
FMSA-461
0.8 amp
ABSOLUTE MAXIMUM RATINGS
TYPICAL CHARACTERISTICS
RECOMMENDED OPERATING CONDITIONS
Input Voltage
0 to 40 VDC continuous
80 V for 100 ms transient
Lead Soldering Temperature (10 sec per lead)
300C
Storage Temperature Range (Case)
65C to +150C
B3-26
FMSA EMI FILTER
0.8 AMP
Input Voltage Range
16 to 40 VDC continuous
Case Operating Temperature (Tc)
55C to +125C full power
Derating Input/Output Current
Derate linearly from 100% at 100C to 0.60
amps at 125C case. Above 125C derate to 0%.
Electrical Characteristics: 25C Tc, nominal Vin, unless otherwise specified.
EMI I
NPUT
F
ILTERS
Capacitance
0.045 F max, any pin to case
Isolation
100 megohm minimum at 500 V
Any pin to case, except case pin
2 F
6800 pF
500 V
6800 pF
500 V
Positive
Input
Input
Common
Positive
Output
Output
Common
FMSA-461
>285 H
6 H
2 F
0.014 F / 500 V
20
20
0.65
6 H
0.014 F / 500 V
0.014 F / 500 V
x 2
x 2
F
IGURE
1: S
CHEMATIC
T
YPICAL
V
ALUES
FMSA-461
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
INPUT VOLTAGE
CONTINUOUS
0
28
40
VDC
TRANSIENT, 100 ms
--
--
80
V
INPUT CURRENT
--
--
0.80
A
DIFFERENTIAL MODE
200 kHz
40
--
--
dB
NOISE REJECTION
500 kHZ TO 50 MHz
60
--
--
COMMON MODE
NOISE REJECTION
2 MHz - 50 MHz
40
--
--
dB
DC RESISTANCE (R
DC
)
TC = 25C
--
--
1.2
OUTPUT VOLTAGE
STEADY STATE
V
OUT
= V
IN
- I
IN
(R
DC
)
VDC
OUTPUT CURRENT
STEADY STATE (<100C CASE)
--
--
0.80
A
INTERNAL POWER
DISSIPATION
MAXIMUM CURRENT
--
--
0.96
W
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.
PIN OUT
MODEL NUMBERING KEY
Squared corner and
dot on top of cover
indicate pin one.
1
3
8
4
7
2
6 5
BOTTOM
VIEW
FMSA
FMSA - 461 / 883
Base Model
MIL-STD-461 Reference
Screening
(Standard screening has no designator
in this position.)
B3-27
EMI I
NPUT
F
ILTERS
See Section B8, case A1, for dimensions.
Pin
Designation
1
Positive Input
2, 3
Positive Output
4
Case Ground
5, 6
Output Common
7
Input Common
8
Case Ground
F
IGURE
3: P
IN
O
UT
DSCC NUMBER
DSCC D
RAWING
(5915)
96003-01HXC
FMSA
-461 F
ILTER
S
IMILAR
P
ART
FMSA-461/883
For exact specifications for a DSCC product, refer to the
DSCC drawing. See Section A3, "SMD/DSCC Lists", for
more information.
FMSA EMI FILTER
0.8 AMP
RL
Positive
Output
FMSA-461
Positive
Input
Input
Common
Case
Ground
Output
Common
C
R
DC/DC Converter
Input
Common
Case
Ground
Output
Common
RL
Multiple units
allowed up to
rated output current.
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.
Positive
Input
Positive
Output
F
IGURE
2: D
AMPING
C
IRCUIT
B3-28
Typical Performance Curves: 25C Tc , nominal Vin, unless otherwise specified.
EMI I
NPUT
F
ILTERS
FMSA EMI FILTER
0.8 AMP
CE03 LIMIT
NARROWBAND
FREQUENCY (MHz)
EMISSION LEVEL (dB A)
0.1
1
10
50
90
80
70
60
50
40
30
20
10
0
.015
F
IGURE
4
FREQUENCY (MHz)
EMISSION LEVEL (dB A)
0.1
1
10
50
90
80
70
60
50
40
30
20
10
0
.015
NARROWBAND
CE03 LIMIT
F
IGURE
5
F
IGURE
6
MSA2805S converter without a filter.
MSA2805S converters at full load with
an FMSA-461 EMI filter
Typical Output Impedance (Z)
With Input Shorted
FMSA-461 EMI Filter
FREQUENCY (Hz)
MAGNITUDE OF Z
o
(Ohms)
10K
100K
1M
10.0
3.2
1.0
0.32
0.10
1K
2
F external capacitor on filter output
26621-001-DTS Rev A
DQ# 4005
All technical information is believed to be accurate, but no responsibility is
assumed for errors or omissions. Interpoint reserves the right to make changes in
products or specifications without notice. MGH Series is a trademark of Interpoint.
Copyright 1994 - 1999 Interpoint. All rights reserved.
B8-6
CASE A
C
ASES
CASE A
BOTTOM VIEW
See Figures 2 - 4
for pin configurations.
Dot on top of case
indicates pin one.
0.975 max
(24.77)
0.800 max
(20.32)
Materials
Header
Kovar/Nickel/Gold
(Case A3, Kovar/Nickel)
Cover Kovar/Nickel
Pins Kovar/Nickel/Gold,
matched glass seal
Case dimensions in inches (mm)
Tolerance
0.005 (0.13) for three decimal places
0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage
the device. Solder pins individually with heat
application not exceeding 300
C for 10 seconds
per pin.
0.000
0.097
(2.46)
0.697
(17.70
Squared corner and dot on
top of case indicate pin one.
0.397
(10.08)
0.000
0.135 (3.43)
0.835 (21.21)
0.270 max
(6.98)
0.000
0.735 (18.67)
Projection Weld
Seam Seal
FMSA EMI Filter: Screening Standard, ES, or 883
STF EMI Filter: Screening Space Standard, H, or K
1
3
8
4
7
2
6 5
BOTTOM VIEW CASE A1
0.270 max
(6.86)
0.000
0.27
0.02
(6.9
0.5)
0.27
0.02
(6.9
0.5)
0.018
0.002 dia.
(0.46
0.05)
0.000
0.097
(2.46)
0.697
(17.70
0.000
0.135 (3.43)
0.835 (21.21)
0.270 max
(6.98)
0.000
1
4
7
5
2
3
6
0.235 (5.97)
0.435
(11.05)
0.535 (13.59)
MCH Series: Screening Standard, ES, or 883
SLH Series: Screening Space Standard, H, or K
BOTTOM VIEW CASE A2
0.270 max
(6.86)
0.000
0.27
0.02
(6.9
0.5)
0.27
0.02
(6.9
0.5)
Projection Weld
Seam Seal
Squared corner and dot on
top of case indicate pin one.
0.018
0.002 dia.
(0.46
0.05)
0.000
0.097
(2.46)
0.697
(17.70
0.000
0.135 (3.43)
0.835 (21.21)
1
8
16
9
2 3
0.235 (5.97)
14
15
DCH Series: Screening Standard or ES
0.335 (8.51)
BOTTOM VIEW CASE A3
0.350 max
(8.89)
0.350 max
(8.89)
0.000
0.27
0.02
(6.9
0.5)
0.018
0.002 dia.
(0.46
0.05)
Projection Weld
Dot on top of case
indicates pin one.
0.000
0.27
0.02
(6.9
0.5)
Seam Seal
F
IGURE
2: C
ASE
A1
F
IGURE
3: C
ASE
A2
F
IGURE
4: C
ASE
A3
F
IGURE
1: C
ASE
A M
AXIMUM
D
IMENSIONS
Note: Although every effort has been made to render the case
drawings at actual size, variations in the printing process may
cause some distortion. Please refer to the numerical dimensions
for accuracy.
C2-10
TEST (125C Products)
STANDARD
/ES
/883 (Class H)*
PRE-CAP INSPECTION
Method 2017, 2032
yes
yes
yes
TEMPERATURE CYCLE (10 times)
Method 1010, Cond. C, -65C to 150C
no
no
yes
Method 1010, Cond. B, -55C to 125C
no
yes
no
CONSTANT ACCELERATION
Method 2001, 3000 g
no
no
yes
Method 2001, 500 g
no
yes
no
BURN-IN
Method 1015, 160 hours at 125C
no
no
yes
96 hours at 125C case (typical)
no
yes
no
FINAL ELECTRICAL TEST MIL-PRF-38534, Group A
Subgroups 1 through 6: -55C, +25C, +125C
no
no
yes
Subgroups 1 and 4: +25C case
yes
yes
no
HERMETICITY TESTING
Fine Leak, Method 1014, Cond. A
no
yes
yes
Gross Leak, Method 1014, Cond. C
no
yes
yes
Gross Leak, Dip (1 x 10
-3
)
yes
no
no
FINAL VISUAL INSPECTION
Method 2009
yes
yes
yes
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
*883 products are built with element evaluated components and are 100% tested and guaranteed over
the full military temperature range of 55C to +125C.
MOR Series
MFLHP Series
MFL Series
MHP Series
MTR Series
MQO Series**
MHD Series
MHV Series
MHF+ Series
MHF Series**
MGA Series
MSA Series
MGH Series
MCH Series
FM-704A EMI Filter
FMD**/FME EMI Filter
FMC EMI Filter
FMH EMI Filter
FMGA EMI Filter
FMSA EMI Filter
HUM Modules**
LCM Modules**
LIM Modules
QA SCREENING
125C PRODUCTS
125C P
RODUCTS
Applies to the following products
**MFLHP Series, MQO Series, MHF Series, FMD EMI Filters, Hum Modules, and LCM Modules do not offer
`883" screening.
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