FMSA-461 Interpoint Corp., FMSA-461 Datasheet

FMSA-461

Manufacturer Part Number

FMSA-461

Description

Emi Input Filter

Manufacturer

Interpoint Corp.

Datasheet

1.FMSA-461.pdf (6 pages)

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• –55°C to +125°C operation

• 50 dB minimum attenuation

• Compliant to MIL-STD-461C, CE03

• Compatible with MIL-STD-704E

DESCRIPTION

The FMSA-461 EMI filter module has been designed as a

companion for Interpoint MSA flyback power converters. Multiple

MSA power converters can be operated from a single filter provided

the total power line current does not exceed the filter maximum

rating. The FMSA filter will reduce the MSA’s power line reflected

ripple current to within the limit of MIL-STD-461C, Method CE03, as

shown in the example of Figures 4 and 5.

The FMSA is fabricated using thick film hybrid technology and is

sealed in a metal package for military, aerospace and other appli-

cations requiring EMI suppression. The filter uses only ceramic

capacitors for reliable high temperature operation.

The MSA power converter has an internal 2 µF capacitor across its

input power terminals. When the MSA and FMSA filters are used

together, this capacitor becomes part of the filter and forms its final

LC output section. When 2 or 3 MSAs are used with a single filter,

this capacitor becomes 4 µF or 6 µF respectively, rather than 2 µF,

improving the rejection vs. frequency.

EATURES

at 500 kHz

DC power bus

PERATION

Size (max.): 0.980 x 0.805 x 0.270 (24.89 x 20.45 x 6.86 mm)

Weight:

Screening: Standard, ES, or 883 (Class H)

Case A1

10.3 grams typical, 11.5 grams maximum

EMI I

28 V

NPUT

OLT

The FMSA filter can also be used with other types of Interpoint

power converters (MHF, MHF+, MHE, MHD, and DCH series) to

comply with CE03. For MHF, MHF+, MHD, and MHE models, the

converter has an LC type line filter such that an inductor is seen

looking into its positive input terminal. For these converters, it is

necessary to terminate the filter with a capacitor to insure uncondi-

tionally stable operation. A capacitor across the filter output termi-

nals of greater than 4µF or the optional damping circuit shown on

the connection diagram will be adequate for stable operation. No

capacitor is required for MSA, or DCH models.

The optional damping circuit (Figure 2) can be used to prevent filter

overshoot caused by MIL-STD-704A 80 V, or other, transients

having rise times of less than 200 µSec. This damping can be alter-

nately provided with a 1.50 Ω resistor in series with the filter positive

input where the additional line loss can be tolerated. For transients

with rise times of greater than 200 µsec, there is no overshoot and

the damping circuit is not required.

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

through a low impedance connection to minimize EMI.

AYOUT

PTIONAL

NPUT

ILTER

EQUIREMENTS

AMPING

IRCUIT

FMSA EMI FILTER

FMSA-461

MODEL

0.8 AMP

0.8 amp

Related parts for FMSA-461

FMSA-461 Summary of contents

Page 1

... Weight: Screening: Standard, ES, or 883 (Class H) DESCRIPTION The FMSA-461 EMI filter module has been designed as a companion for Interpoint MSA flyback power converters. Multiple MSA power converters can be operated from a single filter provided the total power line current does not exceed the filter maximum rating. The FMSA filter will reduce the MSA’ ...

Page 2

... F FMSA-461 – T IGURE CHEMATIC YPICAL TYPICAL CHARACTERISTICS Capacitance • 0.045 µF max, any pin to case Isolation • 100 megohm minimum at 500 V • Any pin to case, except case pin FMSA-461 TYP MAX UNITS 28 40 VDC — — 0.80 A — — ...

Page 3

... Input Common 8 Case Ground DSCC NUMBER DSCC D -461 F RAWING FMSA (5915 IMILAR 96003-01HXC FMSA-461/883 For exact specifications for a DSCC product, refer to the DSCC drawing. See Section A3, “SMD/DSCC Lists”, for more information. ® EMI I F NPUT ILTERS DC/DC Converter Positive Positive Output ...

Page 4

... FREQUENCY (MHz) MSA2805S converter without a filter IGURE NARROWBAND .015 0 FREQUENCY (MHz) MSA2805S converters at full load with an FMSA-461 EMI filter F 5 IGURE 2 µF external capacitor on filter output 1K 10K 100K FREQUENCY (Hz) Typical Output Impedance (Z) With Input Shorted FMSA-461 EMI Filter F 6 ...

Page 5

... Solder pins individually with heat application not exceeding 300 C for 10 seconds per pin IGURE FMSA EMI Filter and STF EMI Filter Seam Seal P rojection Weld Seal hole: 0.056 ±0.002 (1.42 ±0.05) Please refer to the above written numerical dimensions for accuracy. ® ...

Page 6

... FMSA Rev B 20050522 All technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in 6 products or specifications without notice. FMSA Series is a trademark of Interpoint. Copyright © 1994 - 2005 Interpoint. All rights reserved. EMI I F NPUT ILTERS 125° ...

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