B3-17

DESCRIPTION

Interpoint specifically designed the FMH-461™ EMI filter to reduce

the input line reflected ripple current of the following high frequency

series converters. It will also reduce EMI for several of Interpoint’s

lower frequency converters: MHE/MLP, MHL, MTO, and MTW

series. The FMH-461 filter is ideal for use in applications which must

meet MIL-STD-461C levels of conducted and radiated emissions.

Throughput current is 1.5 amps. At 16 VDC input (low line), the filter

provides 24 watts of throughput power.

When used in conjunction with Interpoint converters, the FMH-461

EMI filter reduces input ripple current by 35 dB or greater at 200 kHz

and by at least 50 dB at 500 kHz (see Figures 5 and 6 and electrical

characteristics table). This attenuation gives the converter/filter

combination performance which exceeds MIL-STD-461C’s CE03

test.

FMH-461 filters are rated for full power operation from –55°C to

+125°C baseplate temperature. Operation is offered up to the

absolute maximum of +135°C with derating as defined in

“Recommended Operating Conditions” on the following page. The

maximum DC insertion loss at full load and nominal input voltage

(28 VDC) represents a power loss of less than 2%.

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

through a low impedance connection to minimize EMI.

1. MSA models may require an inductor in series with the MSA’s positive input.

2 µH is the suggested value.

FMH EMI FILTER

1.5 AMP

• –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

Size (max.): Non-flanged, case E3

1.460 x 1.130 x 0.330 (37.08 x 28.70 x 8.38 mm)

Flanged, case G3

2.005 x 1.130 x 0.330 inches (50.93 x 28.70 x 8.38 mm)

See Section B8, cases E3 and G3, for dimensions.

Weight:

22 grams typical, 28 grams maximum

Screening:

Standard, ES, or 883 (Class H). See Section C2 for screening

options, see Section A5 for ordering information.

MODEL

FMH-461

1.5 amp