F
EATURES
• –55°C to +85°C operation
• 50 dB minimum attenuation
at 500 kHz
• Compliant to MIL-STD-461C, CE03
• Overvoltage protection
EMI I
NPUT
F
ILTER
28 V
OLT
I
NPUT
MSF EMI FILTER
0.8 AMP
MODEL
MSF-461
0.8 amp
Size (max.): 1.075 x 1.075 x 0.370 (27.31 x 27.31 x 9.40 mm)
See Section B8, cases C3, for dimensions.
Weight:
15 grams typical, 16 grams maximum
Screening: Standard or ES. See Section C2 for screening
options, see Section A5 for ordering information.
DESCRIPTION
The MSF-461 EMI filter module has been specifically designed to
reduce the input line reflected ripple current of Interpoint’s MSR and
DCH Series of DC/DC converters. They are intended for use in
applications where switch-mode DC/DC converters, operating at a
frequency of higher than 50 kHz, must meet MIL-STD-461C levels
of conducted power line noise.
MSF-461 EMI filters are built using thick-film hybrid technology and
are sealed in metal packages for military, aerospace, and other
high-reliability applications. See Section B8, case C3, for dimen-
sions. See Section C2 for screening options.
This gives the filter/converter combination a performance which
exceeds the CE03 test limit of MIL-STD-461C. The CE03 perform-
ance of a model MSR2812D converter with and without the MSF-
461 filter is shown in Figures 4 and 5.
F
ILTER
O
PERATION
The MSF-461 filters are rated to operate, with no degradation of
performance, over the temperature range of –55°C to +85°C (as
measured at the baseplate). Above 85°C, input voltage and current
must be derated as specified in “Derating” on the following page.
The maximum power dissipation of 0.62 watts (at maximum input
current) represents a power loss of less than 10% at typical input
voltage.
MIL-STD N
OISE
M
ANAGEMENT
When used in conjunction with Interpoint’s DC/DC converters (see
connection diagram, Figure 2), the input ripple current will be
reduced by 50 dB within the frequency band of 50 kHz to 50 MHz.
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.
B5-7
INTERPOINT [ INTERPOINT CORPORATION COMPANY ]
