The FME270 Series™ EMI filters are specifically designed to
reduce the reflected input ripple current of Interpoint’s high
frequency DC/DC converters. FME270 filters minimize electro-
magnetic interference (EMI) for the MHP270 Series of converters.
These filters are intended for use in 270 volt applications which
must meet MIL-STD-461C CE03 levels of conducted emissions.
One filter can be used with multiple converters up to the rated
output current of the filter.
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.
t
RansIents
A transient of -500 to +500 V for up to 100 ms will not damage
the filter but will be passed on to the converter:
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 compo-
nents. 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 applica-
tions. Common mode noise occurs across stray capacitances
between the converter’s power train components and the base-
plate (bottom of the package) of the converter.
Where low noise currents are required to meet MIL-STD-461C,
a power line filter is needed. The FME270 EMI power line filters
reduces the common mode and differential noise generated by
the converters. FME270 filters reduce input ripple current by as
much as 50 dB at 500 kHz and 55 dB at 1 MHz when used in
conjunction with Interpoint’s DC/DC converters.
O
peRatIOn OveR
t
eMpeRatuRe
The FME270-461 Series filters are rated for full power opera-
tion from -55°C to +125°C case temperature. Current is derated
linearly to zero at +135°C case temperature.
I
nseRtIOn
l
Oss
p
ackagIng
The maximum dc insertion loss at full load and nominal input
voltage represents a power loss of less than 4%.
FME270-461 filters are sealed in metal hermetic side-leaded
packages. See cases U, V, W, Y, and Z.
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • power@crane-eg.com
www.interpoint.com
Page 1 of 11
FME270 Rev B - 20100226
Crane Aerospace & Electronics Power Solutions
FMe270-461 eMi input Filters
270 Volt input – 1.5 aMp
Operating COnditiOns and
CharaCteristiCs
input Voltage range
•
0 to 400 VDC continuous
•
Transient -500 to +500 volts for 100 ms
meChaniCal and envirOnmental
size (maximum)
•
Case U
3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)
The image on page one shows Case U (flanged, short leads).
•
Also available:
‣
Flanged: leads bent down (case V)
‣
Tabbed: leads bent up (case W)
‣
Tabbed: short leads (case Y)
‣
Tabbed: leads bent down (case Z).
•
See cases U, V, W, Y, and Z for dimensions and options.
Weight (maximum)
•
77 grams typical cases U, V, W, Y, and Z
screening
lead soldering temperature (10 sec per lead)
•
300°C
storage temperature range (t
c
)
•
-65°C to +150°C
isolation
•
100 megohm minimum at 500 VDC
•
Any pin to case
Derating input/output current (t
c
)
•
Linearly from 100% at 125°C to zero at 135°C
case operating temperature (t
c
)
•
-55°C to +125°C full power
•
-55°C to +135°C absolute
The FME270 EMI Input filter offers Standard or /ES screening.
See Standard and /ES (non-QML)” screening table for more infor-
mation on page 11.
EMI FILTER
+Vin
Case
Output
Input
Common Common
+Vout
DC/DC CONVERTER
+Vin
+Vout
RL
Case
Output
Input
Common Common
Chassis
ground
Multiple units
allowed up to
rated output
current of filter
RL
F
IguRe
1: c
OnnectIOn
d
IagRaM
Positive
Input
Positive
Output
Input
Common
x2
x2
Output
Common
FME270-461
F
IguRe
2: FMe270-461 s
cheMatIc
www.interpoint.com
Page 2 of 11
FME270 Rev B - 20100226
Crane Aerospace & Electronics Power Solutions
FMe270-461 eMi input Filters
270 Volt input – 1.5 aMp
pin out
pin
1
Designation
1, 2, 3
4, 5, 6
7, 8, 9
—
Positive Input
Input Common
10, 11, 12
Output Common
Positive Output
Case Ground
2
Notes
1. All pins must be connected.
2. The baseplate is the only case ground connection and
should directly contact chassis ground.
Angled corner and cover marking indicate pin one for cases U and V.
Cover marking indicates pin one for cases W, Y and Z.
1
2
3
4
5
6
TOP VIEW
All FME270 models/cases
Outline shown is case U, pin out is the same
for all cases. See cases U, V, W, Y, and Z
for dimensions.
12
11
10
9
8
7
F
IguRe
3: p
In
O
ut
www.interpoint.com
Page 3 of 11
FME270 Rev B - 20100226
Crane Aerospace & Electronics Power Solutions
FMe270-461 eMi input Filters
270 Volt input – 1.5 aMp
MoDel nuMBering key
Base Model
Input Voltage
FME
270 - 461
V
/ ES
MIL-STD-461 Reference
Case/Lead Option*
Screening
(Standard screening has no designator
in this position.)
*Case/Lead Option:
See cases U, V, W, Y, and Z for drawings and dimensions.
O
n the lines belOw
,
enter One selectiOn frOm under each categOry
tO determine the mOdel number
.
category
FMe270
Base MoDel anD
input Voltage
MoDel selection
-461
Mil-stD-461 reFerence
case/leaD
option
1
u (leave blank)
V
W
y
Z
/
______
screening
2
standard (leave blank)
es
selection
“FMe270” is the
only available
selection
“-461” is the only
available selection
Notes:
1. Case U is the standard, side-leaded, flanged case. Leave the option blank for case U. Refer to the case drawings on pages 7 - 10 for other case options.
2. Leave blank for standard screening. Use “ES” for “ES” screening. See page 11 for more information.
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