F
EATURES
• –55°C to +125°C operation
• Up to 60 dB attenuation
at 500 kHz.
• Compliant to
MIL-STD-461C, CE03
• Compatible with
MIL-STD-704E
DC power bus
EMI I
NPUT
F
ILTERS
28 & 270 V
OLT
I
NPUT
FMD/FME EMI FILTER
0.7 TO 15 AMP
MODELS
I
NPUT
V
OLTAGE
AND
C
URRENT
Input (V)
28
28
270
270
Current ( A)
7.0
15.0
0.7
1.5
Size (max.): Case U2, FME all models; Case U1, FMD28-461SL and FMD270-461SL
3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 11.16 mm)
[FME models, shown in Case U2 (flanged, short leads). Also available:
Flanged – leads bent down (case V); Tabbed – leads bent up (case W), short
leads (case Y), and leads bent down (case Z).See Section B8, cases U2, V, W,
Y, and Z for dimensions and options.]
Case J4, FMD28-461
2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm)
See Section B8, cases J4, U1, U2, V, W, Y, and Z for dimensions.
Weight:
77 grams typical cases U1, U2, V, W, Y, and Z; 55 grams typical case J4
Screening: Standard, ES, or 883 (Class H).
See Section C2 for screening options, see Section A5 for ordering information.
DESCRIPTION
The FMD Series™ and FME Series™ EMI filters are specifically
designed to reduce the reflected input ripple current of Interpoint’s
high frequency DC/DC converters. FMD/FME filters minimize elec-
tromagnetic interference (EMI) for the MHE, MHL, MLP, MRH, MTO,
MHF, MHF+, MHV, MHD, MTR, MFL, MHP, and MFLHP Series.
These filters are intended for use in 28 or 270 volt applications
which must meet MIL-STD-461C, CE03 levels of conducted emis-
sions. One filter can be used with multiple converters up to the rated
output current of the filter.
best connection, mount the filter’s and converter’s baseplates on or
above a small ground plane. See Figure 5.
T
RANSIENTS
The transients listed below will not damage the filter but will be
passed on to the converter:
• All filters: ±600 volts (50 ohm source
impedance) for up to 10 µs.
• 28 volt filter: ±100 volts (0.5 ohm source
impedance) for up to 100 ms.
• 270 volt filter: ±500 volts (independent of
source impedance) for up to 100 ms.
I
NPUT
R
IPPLE AND
EMI
Switching DC/DC converters naturally generate two noise compo-
nents on the power input line: differential noise and common mode
noise. Input ripple current refers to both of these components.
Differential noise occurs between the positive input and input
common. Most Interpoint converters have an input filter that reduces
differential noise which is sufficient for many applications. Common
mode noise occurs across stray capacitances between the
converter’s power train components and the baseplate (bottom of
the package) of the converter.
Where low noise currents are required to meet CE03 of MIL-STD-
461, a power line filter is needed. The FMD/FME Series of EMI
power line filters reduces the common mode and differential noise
generated by the converters. FMD/FME-461 filters reduce input
ripple current by as much as 60 dB at 500 kHz and 55 dB at 1 MHz
when used in conjunction with Interpoint’s DC/DC converters. See
Figures 8 and 9.
Place the filter as close as possible to the converter for optimum
performance. The baseplates of the filter and the converter should be
connected with the shortest and widest possible conductors. For the
O
PERATION OVER
T
EMPERATURE
All FMD/FME-461 Series filters are rated for full power operation
from –55°C to +125°C case temperature. Current is derated linearly
to zero at +135°C case temperature.
I
NSERTION
L
OSS
The maximum dc insertion loss at full load and nominal input voltage
represents a power loss of less than 4%.
P
ACKAGING
FMD/FME-461 filters are sealed in metal hermetic side-leaded
packages. See Section B8, cases U1, U2, V, W, Y, and Z.
Additionally the FMD28-461 filter is available in a metal hermetic
down-leaded package (see Section B8, case J4).
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.
B3-7
FMD/FME EMI FILTER
0.7 TO 15 AMP
ABSOLUTE MAXIMUM RATINGS
EMI I
NPUT
F
ILTERS
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 0 to 40 VDC continuous for 28 V models
• 0 TO 400 VDC continuous for 270 V models
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Input/Output Current
• Linearly from 100% at 125°C to 0% at 135° C
Input Voltage
• 0 to 40 VDC continuous for 28 V models
• 0 to 400 VDC continuous for 270 V models
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
Isolation
• 100 megohm minimum at 500 V, any pin to case
(except FMD downleaded case case pin)
Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified.
FMD28-461
PARAMETER
INPUT VOLTAGE
NOISE
REJECTION
DC RESISTANCE
(R
DC
)
CAPACITANCE
OUTPUT VOLTAGE
OUTPUT CURRENT
POWER
DISSIPATION
CONDITION
CONTINUOUS
TRANSIENT 100 ms
1
500 kHz
1 MHz
MAX. CURRENT
Tc=25°C
Tc=125°C
ANY PIN TO CASE
STEADY STATE
STEADY STATE
MAX. CURRENT
Tc=25°C
Tc=125°C
—
—
—
—
—
—
7
6.0
7.4
—
—
—
MIN
0
–100
50
45
—
—
—
TYP
28
—
60
55
—
—
20,000
MAX
40
100
—
—
0.12
0.15
—
MIN
0
–500
50
45
—
—
—
FMD270-461
TYP
270
—
60
55
—
—
30,000
MAX
400
500
—
—
5.0
6.3
—
MIN
0
–100
30
40
—
—
—
FME28-461
TYP
28
—
40
50
—
—
60,000
MAX
40
100
—
—
0.07
0.07
—
0
–500
40
45
—
—
—
FME270-461
MIN
TYP
270
—
50
55
—
—
60,000
MAX
400
500
—
—
2.0
3.2
—
UNITS
VDC
V
dB
Ω
pF
VDC
V
OUT
= V
IN
- I
IN
(R
DC
)
—
—
—
0.7
2.5
3.1
—
—
—
—
—
—
15
15.75
15.75
—
—
—
—
—
—
1.5
4.5
7.2
A
W
Note
1. 28 V models = 0.5
Ω
source impedance, 270 V models = independent of source impedance.
B3-8
EMI I
NPUT
F
ILTERS
PIN OUT SIDE-LEADED MODELS
FMD28-461SL, FMD270-461SL,
FME28-461, and FME270-461
Pin
1
1, 2, 3
4, 5, 6
7, 8, 9
10, 11, 12
—
Designation
Positive Input
Input Common
Output Common
Positive Output
Case Ground
2
FMD/FME EMI FILTER
0.7 TO 15 AMP
Angled corner and cover marking indicate pin one for cases U1, U2, and V.
Cover marking indicates pin one for cases W, Y and Z.
1
2
3
4
5
6
Outline shown is case U2, pin out is the same for all
side-leaded cases. Also available: flanged – leads bent
down (case V); tabbed – leads bent up (case W), short
leads (case Y), and leads bent down (case Z). See
Section B8, cases U1, U2, V, W, Y, and Z for dimensions.
TOP VIEW
All FME models, FMD28-461SL,
and FMD270-461SL
(Pin side, marked side)
12
11
10
9
8
7
Notes
1. All pins must be connected.
2. The baseplate is the only case ground connection and
should directly contact chassis ground.
F
IGURE
6: P
IN
O
UT
S
IDE
-L
EADED
M
ODELS
FMD28-461
Pin
1
2
3
4
5
Designation
Positive Input
Positive Output
Output Common
Case Ground
1
Input Common
PIN OUT DOWN-LEADED MODEL
Squared corner and dot on top
of package indicate pin one.
1
2
BOTTOM VIEW
FMD28-461
5
4
3
Note
1. Although down-leaded packages can be
connected to chassis ground with the case
ground lead, direct contact of the base plate to
chassis improves EMI performance.
See Section B8, case J4, for dimensions.
F
IGURE
7: P
IN
O
UT
FMD28-461
DSCC NUMBERS
DSCC D
RAWING
(5915)
95004-01HXC
95004-01HTC
95004-01HUC
95004-01HYC
95004-01HZC
95009-01HXC
IN PROCESS
IN PROCESS
IN PROCESS
IN PROCESS
FME S
ERIES
S
IMILAR
P
ART
FME28-461/883
FME28-461W/883
FME28-461V/883
FME28-461Y/883
FME28-461Z/883
FME270-461/883
FME270-461W/883
FME270-461V/883
FME270-461Y/883
FME270-461Z/883
MODEL NUMBERING KEY
FME
Base Model
Input Voltage
MIL-STD-461 Reference
Case/Lead Option*
Screening
(Standard screening has no designator
in this position.)
28 - 461
V
/ 883
*Case/Lead Option: See section B8, cases J4, U1, U2, V, W, Y, and Z for
drawings and dimensions, see Section A5 for ordering information.
FME models: Case U2 has no designator in the case/lead option position.
To designate a case option add the case letter to the model number –
FME28-461V.
FMD models: Case J4 (down-leaded) has no designator in the case/lead-
option position. To designate case U1 (side-leaded) for the FMD place
"SL" in the case/lead option position – FMD28-461SL. The 270 volt FMD
is only available in the side-leaded case – FMD270-461SL.
For exact specifications for a DSCC product, refer to the
DSCC drawing. Contact your Interpoint representative for
status on the FME DSCC releases. See Section A3,
“SMD/DSCC Lists”, for more information.
B3-11
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