B5-7

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.

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.

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.

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.

The case of the filter must be connected to the case of the converter

through a low impedance connection to minimize EMI.

MSF EMI FILTER

0.8 AMP

• –55°C to +85°C operation

• 50 dB minimum attenuation

at 500 kHz

• Compliant to MIL-STD-461C, CE03

• Overvoltage protection

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.

MODEL

MSF-461

0.8 amp