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. o peration the msa power converter has an internal 2 f 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 f or 6 f respectively, rather than 2 f, improving the rejection vs. frequency. 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 4f 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. o ptional d amping c ircuit 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 sec. this damping can be alter- nately provided with a 1.50 ? 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 sec, there is no overshoot and the damping circuit is not required. 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. emi i nput f ilter 28 v olt i nput fmsa emi filter 0.8 amp f eatures ? ?55c to +125c operation ? 50 db minimum attenuation at 500 khz ? compliant to mil-std-461c, ce03 ? compatible with mil-std-704e dc power bus size (max.): 0.980 x 0.805 x 0.270 (24.89 x 20.45 x 6.86 mm) see cases ?a maximum dimensions? and ?a1? for dimensions. weight: 10.3 grams typical, 11.5 grams maximum screening: standard, es or class h see ?qa screening: class h, qml? for more information. model FMSA-461 0.8 amp
absolute maximum ratings typical characteristics recommended operating conditions input voltage ? 0 to 50 vdc continuous ? 80 v for 100 ms transient lead soldering temperature (10 sec per lead) ? 300c storage temperature range (case) ? ?65c to +150c fmsa emi filter 0.8 amp input voltage range ? 16 to 40 vdc continuous case operating temperature (tc) ? ?55c to +125c full power derating input/output current ? derate linearly from 100% at 100c to 0.60 amps at 125c case. above 125c derate to 0%. electrical characteristics: 25c tc, nominal vin, unless otherwise specified. emi i nput f ilters capacitance ? 0.045 f max, any pin to case isolation ? 100 megohm minimum at 500 v ? any pin to case, except case pin 2 f 6800 pf 500 v 6800 pf 500 v positive input input common positive output output common FMSA-461 >285 h 6 h 2 f 0.014 f / 500 v 20 20 0.65 6 h 0.014 f / 500 v 0.014 f / 500 v x 2 x 2 f igure 1: s chematic ? t ypical v alues FMSA-461 parameter conditions min typ max units input voltage continuous 0 28 40 vdc transient 1 , 100 ms ? ? 80 v input current 1 ? ? 0.80 a noise rejection 500 khz 50 ? ? db 1 mhz 50 ? ? noise rejection 5 mhz 45 ? ? db dc resistance (r dc ) tc = 25c ? ? 1.2 ? output voltage steady state v out = v in - i in (r dc ) vdc output current steady state (<100c case) ? ? 0.80 a internal power dissipation maximum current ? ? 0.96 w the case ground connection between the filter and the converter should be as low an impedance as possible to minimize emi. direct contact of baseplate to chassis ground provides the lowest impedance. notes: 1. guaranteed by design, not tested.
pin out model numbering key squared corner and dot on top of cover indicate pin one. 13 84 7 2 65 bottom view fmsa fmsa - 461 / 883 base model mil-std-461 reference screening (standard screening has no designator in this position.) emi i nput f ilters see cases ?a maximum dimensions? and ?a1? for dimensions. pin designation 1 positive input 2, 3 positive output 4 case ground 5, 6 output common 7 input common 8 case ground f igure 3: p in o ut dscc number dscc d rawing (5915) 96003-01hxc fmsa -461 f ilter s imilar p art FMSA-461/883 for exact specifications for a dscc product, refer to the dscc drawing: http://www.dscc.dla.mil/programs/smcr fmsa emi filter 0.8 amp r l positive output FMSA-461 positive input input common case ground output common c r dc/dc converter input common case ground output common r l multiple units allowed up to rated output current. the rc output is an optional damping circuit. it is recommended in applications where 80 volt line transients may occur with rise times <200 s. see text page one "connection and operation." c = 10 f, 100v e c = sprague 109d106x9100c2 r = 2.2 , 5%, 1/4 w, carbon comp. positive input positive output f igure 2: d amping c ircuit
typical performance curves: 25c tc , nominal vin, unless otherwise specified. emi i nput f ilters fmsa emi filter 0.8 amp ce03 limit narrowband frequency (mhz) emission level (db a) 0.1 1 10 50 90 80 70 60 50 40 30 20 10 0 .015 f igure 4 frequency (mhz) emission level (db a) 0.1 1 10 50 90 80 70 60 50 40 30 20 10 0 .015 narrowband ce03 limit f igure 5 f igure 6 msa2805s converter without a filter. msa2805s converters at full load with an FMSA-461 emi filter typical output impedance (z) with input shorted FMSA-461 emi filter frequency (hz) magnitude of z o (ohms) 10k 100k 1m 10.0 3.2 1.0 0.32 0.10 1k 2 f external capacitor on filter output fmsa emi filter, rev c, november 1, 2005 (format) 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 products or specifications without notice. mgh series is a trademark of interpoint corporation. copyright ? 1994 - 2006 interpoint corporation. all rights reserved.
cases s ee c as e s a1 - a 3 for pin config u r a tion s . dot on top of c as e indic a te s pin one. 0.9 8 0 m a x (24. 8 9) 0. 8 05 m a x (20.45) materials he a der c as e s a1 a nd a2 kov a r/nickel/gold c as e a 3 kov a r/nickel) cover kov a r/nickel pin s kov a r/nickel/gold, m a tched gl ass s e a l case dimensions in inches (mm) toler a nce 0.005 (0.1 3 ) for three decim a l pl a ce s 0.01 (0. 3 ) for two decim a l pl a ce s u nle ss otherwi s e s pecified caution he a t from reflow or w a ve s oldering m a y d a m a ge the device. s older pin s individ ua lly with he a t a pplic a tion not exceeding 3 00c for 10 s econd s per pin. c as e a m a xim u m dimen s ion s , rev b, s eptem b er 2 3 , 2005 ple as e refer to the n u meric a l dimen s ion s for a cc u r a cy. all inform a tion i s b elieved to b e a cc u r a te, bu t no re s pon s i b ility i s assu med for error s or omi ss ion s . interpoint re s erve s the right to m a ke ch a nge s in prod u ct s or s pecific a tion s witho u t notice. copyright ? 1999-2005 interpoint corp. all right s re s erved. ca s e a maximum dimen s ion s bottom view
cases 0.000 0.097 (2.46) 0.697 (17.70 s q ua red corner a nd dot on top of c as e indic a te pin one. 0. 3 97 (10.0 8 ) 0.000 0.1 3 5 ( 3 .4 3 ) 0. 83 5 (21.21) 0.270 m a x (6.9 8 ) 0.000 0.7 3 5 (1 8 .67) projection weld s e a m s e a l fm s a emi filter a nd s tf emi filter 1 3 8 4 7 2 65 bottom view ca s e a1 0.270 m a x (6. 8 6) 0.000 0.27 0.02 (6.9 0.5) 0.27 0.02 (6.9 0.5) 0.01 8 0.002 di a . (0.46 0.05) s e a l hole: 0.056 0.002 (1.42 0.05) c as e a1, rev b, s eptem b er 8 , 2005 ple as e refer to the n u meric a l dimen s ion s for a cc u r a cy. all inform a tion i s b elieved to b e a cc u r a te, bu t no re s pon s i b ility i s assu med for error s or omi ss ion s . interpoint re s erve s the right to m a ke ch a nge s in prod u ct s or s pecific a tion s witho u t notice. copyright ? 1999-2005 interpoint corp. all right s re s erved. case dimensions in inches (mm) to l e r a nce 0.005 (0.1 3 ) for three decim a l pl a ce s 0.01 (0. 3 ) for two decim a l pl a ce s u nle ss otherwi s e s pecified caution he a t from reflow or w a ve s oldering m a y d a m a ge the device. s older pin s individ ua lly with he a t a pplic a tion not exceeding 3 00c for 10 s econd s per pin
quality assurance class h, qml screening page 1 of 1 test 125c 125c class h standard /es /883 non-qml non-qml qml pre-cap inspection method 2017, 2032 yes yes yes temperature cycle (10 times) method 1010, cond. c, -65c to 150c, ambient no no yes method 1010, cond. b, -55c to 125c, ambient no yes no constant acceleration method 2001, 3000 g no no yes method 2001, 500g no yes no burn-in method 1015, 160 hours at 125c case, typical no no yes 96 hours at 125c case, typical no yes no final electrical test mil-prf-38534, group a subgroups 1 through 6: -55c, +25c, +125c case no no yes subgroups 1 and 4: +25c case yes yes no hermeticity test fine leak, method 1014, cond. a no yes yes gross leak, method 1014, cond. c no yes yes gross leak, dip (1 x 10 -3 ) yes no no final visual inspection method 2009 yes yes yes test methods are referenced to mil-std-883 as determined by mil-prf-38534. c lass h, qml s creening qa screening class h, qml rev b november 1, 2005 (typo). this revision supercedes all previous releases. all technical infor- mation is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. copyright ? 2005 interpoint corporation. all rights reserved.
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