F
EATURES
• –55°C to +125°C operation
• 50 dB minimum attenuation
at 500 kHz
• Compliant to MIL-STD-461C, CE03
• Compatible with MIL-STD-704E
DC power bus
EMI I
NPUT
F
ILTER
28 V
OLT
I
NPUT
FMSA EMI FILTER
0.8 AMP
MODEL
FMSA-461
0.8 amp
Size (max.): 0.980 x 0.805 x 0.270 (24.89 x 20.45 x 6.86 mm)
Case A1
Weight:
10.3 grams typical, 11.5 grams maximum
Screening: Standard, ES, or 883 (Class H)
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.
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 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.
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.
®
1
FMSA EMI FILTER
0.8 AMP
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 0 to 40 VDC continuous
• 80 V for 100 ms transient
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
EMI I
NPUT
F
ILTERS
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
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%.
TYPICAL CHARACTERISTICS
Capacitance
• 0.045 µF max, any pin to case
Isolation
• 100 megohm minimum at 500 V
• Any pin to case, except case pin
Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified.
PARAMETER
INPUT VOLTAGE
INPUT CURRENT
DIFFERENTIAL MODE
NOISE REJECTION
COMMON MODE
NOISE REJECTION
DC RESISTANCE (R
DC
)
OUTPUT VOLTAGE
OUTPUT CURRENT
INTERNAL POWER
DISSIPATION
CONDITIONS
CONTINUOUS
TRANSIENT, 100 ms
200 kHz
500 kHZ TO 50 MHz
2 MHz - 50 MHz
TC = 25°C
STEADY STATE
STEADY STATE (<100°C CASE)
MAXIMUM CURRENT
—
—
MIN
0
—
—
40
60
40
—
FMSA-461
TYP
28
—
—
—
—
—
—
V
OUT
= V
IN
- I
IN
(R
DC
)
—
—
0.80
0.96
MAX
40
80
0.80
—
—
—
1.2
UNITS
VDC
V
A
dB
dB
Ω
VDC
A
W
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
1: S
CHEMATIC
– T
YPICAL
V
ALUES
®
2
EMI I
NPUT
F
ILTERS
FMSA-461
Positive
Input
Positive
Output
C
Case
Ground
Input
Common
Output
Common
R
Case
Ground
Input
Common
Output
Common
DC/DC Converter
Positive
Input
Positive
Output
FMSA EMI FILTER
0.8 AMP
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: D
AMPING
C
IRCUIT
PIN OUT
Squared corner and
dot on top of cover
Pin
1
2, 3
4
5, 6
7
8
Designation
Positive Input
Positive Output
Case Ground
Output Common
Input Common
Case Ground
indicate pin one.
1
2 3
4
BOTTOM
8
VIEW
FMSA
7
6 5
See Section B8, case A1, for dimensions.
F
IGURE
3: P
IN
O
UT
DSCC NUMBER
DSCC D
RAWING
(5915)
96003-01HXC
FMSA
-461 F
ILTER
MODEL NUMBERING KEY
FMSA - 461
Base Model
MIL-STD-461 Reference
Screening
(Standard screening has no designator
in this position.)
/
883
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.
®
3
EMI I
NPUT
F
ILTERS
Dot on top of case
indicates pin one.
CASE A
BOTTOM VIEW
0.805 max
See cases A1 - A3
(20.45)
for pin configurations.
FMSA EMI FILTER
0.8 AMP
0.980 max
(24.89)
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.
F
IGURE
7: C
ASE
A M
AXIMUM
D
IMENSIONS
BOTTOM VIEW CASE A1
FMSA EMI Filter and STF EMI Filter
Seam Seal
Projection
Weld
0.697
(17.70
0.397
(10.08)
0.097
(2.46)
0.000
0.270 max
(6.98)
0.000
0.000
Squared corner and dot on
top of case indicate pin one.
1
8
7
2 3
4
6 5
0.135 (3.43)
0.018
±
0.002 dia.
(0.46
±
0.05)
Seal hole: 0.056
±0.002
(1.42
±0.05)
F
IGURE
8: C
ASE
A1
Please refer to the above written numerical dimensions for accuracy.
®
0.735 (18.67)
0.835 (21.21)
0.270 max
(6.86)
0.27
±0.02
(6.9
±0.5)
0.27
±0.02
(6.9
±0.5)
0.000
5
嵌入式系统
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