description the interpoint ? fmd28 series? emi filters are specifically designed to reduce the reflected input ripple current of interpoint high frequency dc-dc converters. fmd filters minimize electromagnetic interference (emi) for the mor, mfl, mtr, mhv, mhf+, mhf, mto and mhe series of converters. these filters are intended for use in 28 volt applications which must meet mil-std-461c ce03 levels of conducted emissions. one filter can be used with multiple converters up to the rated output current of the filter. i nput r ipple and emi switching dc-dc converters naturally generate two noise components on the power input line: differential noise and common mode noise. input ripple current refers to both of these components. differential noise occurs between the positive input and input common. most interpoint converters have an input filter that reduces differential noise which is sufficient for many applications. common mode noise occurs across stray capacitances between the converters power train components and the baseplate (bottom of the package) of the converter. see figure 1: fmd28-461 block diagram on page 2 where low noise currents are required to meet ce03 of mil-std-461c a power line filters reduces the common mode and differential noise generated by the converters. fmd28-461 filters reduce input ripple current by a minimum of 50 db at 500 khz when used in conjunction with interpoint dc-dc converters. place the filter as close as possible to the converter for optimum performance. the baseplates of the filter and the converter should be connected with the shortest and widest possible conductors. see figure 2: conn ection diagram on page 2. t ransients a transient of 100 v for up to 100 ms with a 0.5 ohm source impedance will not damage the filter. o per ation over t emper ature the fmd28-461 series filters are rated for full power operation from -55c to +125c case temperature. current is derated linearly to zero at +135c case temperature. i nser tion l oss the maximum dc insertion loss at full load and nominal input voltage represents a power loss of less than 1.3%. p ackaging fmd28-461 filters are sealed in metal hermetic, down-leaded packages, figure 6: case j4 - fmd28-461 on page 6. also available in a side-leaded package, figure 7: case u - fmd28- 461sl on page 7. features a ttenuation to 50 db at 500 khz ? operating temperature -55 to +125c ? nominal 28 v input, 0 to 50 v operation ? t ransient rating to 100 v for 100 ms ? up to 7 a throughput current ? compliant to mil-std-461c, ce03 ? compatible with mil-std-704 a-e 28 vdc power bus fmd28-461 e m i i nput filters page 1 of 8 fmd28 rev aa - 2014.02.06 28 volt input C 7 am p crane aerospace & electronics power solutions crane aerospace & electronics power solutions C interpoint products 10301 willows road ne, redmond, wa 98052 +1.425.882.3100 ? power@crane-eg.com www.craneae.com/interpoint
+vin +vout input common output common case r l r l emi filter dc-dc converter +vin +vout input common output common case chassis ground multiple units allowed up to rated output current of filter f igure 1: fmd 28-461 b lock d iagram f igure 2: c onnection d iagram 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. 0.1 f 50 v 0.015 f 500 v positive input input common positive output output common 4.1 h 4.1 h 4.1 h 135 h 6 f 50 v 10 f 50 v 1.3 v 135 h 0.015 f 500 v 0.015 f 500 v page 2 of 8 fmd28-461 e m i i nput filters 28 volt input 7 am p fmd28 rev aa - 2014.02.06 crane aerospace & electronics power solutions www.craneae.com/interpoint
f igure 3: p in o ut fm d28-461 5 4 3 1 2 squared corner and dot on top of package indicate pin one. bottom view fmd28-461 see figure 6: case j4 - fmd28-461 on page 6 for dimensions. t able 1: p in o ut fm d28-461 t able 2: p in o ut fm d28-461sl page 3 of 8 fmd28-461 e m i i nput filters 28 volt input C 7 am p fmd28 rev aa - 2014.02.06 notes 1. all pins must be connected. 2. the baseplate is the only case ground connection and should directly contact chassis ground. p in fmd28-461 1 positive input 2 positive output 3 output common 4 case ground 1 5 input common p in 1 fmd28-461 sl 1, 2, 3 positive input 4, 5, 6 input common 7, 8, 9 output common 10, 1 1, 12 positive output case ground 2 angled corner and cover marking indicate pin one. top view fmd28-461 1 2 3 4 5 6 12 11 10 9 8 7 see figure 7: case u - fmd28-461sl on page 7 for dimensions. f igure 4: p in o ut fm d28-461sl 1. although the down-leaded packages can be connected to chassis ground with the case ground lead, direct contact of the base plate to chassis improves emi performance. crane aerospace & electronics power solutions www.craneae.com/interpoint
m o d el nu mb ering key fmd 28 - 461 sl / es base model input voltage mil-std-461 reference screening case option (leave blank for down-leaded case, j4) (standard screening has no designator in this position.) f igure 5: m odel n umbering k ey m o d el n u mb er o ptions 1 t o determine the model number enter one option from each ca t egory in the form below . c ategory base model and i nput voltage c ase o ption 2 s creening 3 o ptions fmd28-461 (down-leaded case, j4, leave blank) standard (leave blank) sl (side-leaded case, u) /es fill in f or m o d el # fmd28-461 __________ / notes: 1. see model numbering key above for an example of a model number. 2. case options: leave the case option blank for the standard, down-leaded case, figure 6: case j4 - fmd28-461 on page 6. use sl in the case option position for the side-leaded case, figure 7: case u - fmd28-461sl on page 7. 3. screening: for standard screening leave the screening option blank. for other screening options, insert the desired screening level. for more information see table 6: environmental screening on page 8. t able 3: m odel n umber o ptions page 4 of 8 fmd28-461 e m i i nput filters 28 volt input C 7 am p fmd28 rev aa - 2014.02.06 crane aerospace & electronics power solutions www.craneae.com/interpoint
t able 4: o per ating c onditions 25 c case , 28 vdc in , unless other wise specified note 1. guaranteed by design and/or analysis. not an in-line test. 2. 0.5 ohm source impedance note 1. guaranteed by design and/or analysis. not an in-line test. fmd28-461 parameter conditions min typ max units input voltage continuous 0 28 50 1 vdc transient 100 ms 1, 2 -100 100 v noise rejection 500 khz 50 60 db 1 mhz 45 55 dc resistance (r dc ) at maximum current 1 t c = 25c 0.12 t c = 125c 0.15 capacitance 1 any pin to case 20,000 pf output voltage steady state v out = v in - i in (r dc ) vdc output current steady state 7 a power dissipation at maximum current 1 t c = 25c 6.0 w t c = 125c 1 7.4 t able 5: e lectrical c haracteristics 25 c case , 28 v in , unless other wise specified page 5 of 8 fmd28-461 e m i i nput filters 28 volt input C 7 am p fmd28 rev aa - 2014.02.06 fmd28-461 parameter conditions min typ max units lead soldering temperature 1 10 seconds max. 300 c storage temperature 1 -65 +150 c case operating full power -55 +125 c temperature 1 absolute -55 +135 derating output power/current 1 linearly from 100% at 125c to 0% at 135c isolation, any pin to case e xcept case pin @ 500 vdc a t 25c 100 megohms crane aerospace & electronics power solutions www.craneae.com/interpoint
0.040 dia. (1.02) 0.000 (0.27 (6.9)) 5 4 3 0.000 0.170 (4.32) 0.210 (5.33) 1.370 (34.80) 1.770 (44.96) 2.150 (54.61) 1 2 0.173 (4.39) 0.000 1.173 (29.79) 0.673 (17.09) bottom view case j4 solder seal solder tip-off 0.457 max (11.61) squared corner and dot on top of case indicate pin one. 1.350 max. (34.29) flange thickness: 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) weight: 55 grams typical case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.3) for two decimal places unless otherwise specified caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300c for 10 seconds per pin. materials header cold rolled steel/nickel/gold cover kovar/nickel pins #52 alloy/gold compression glass seal. gold plating of 50 - 150 microinches included in pin diameter. seal hole: 0.091 0.002 (2.31 0.05) case j4 fmd, rev g, 2014.02.05 please refer to the numerical dimensions for accuracy. 2 x r 0.170 (4.32) (2.720 max (69.09)) 2 x dia 0.162 0.002 (4.11 0.05) f igure 6: c ase j4 - fm d28-461 page 6 of 8 fmd28-461 e m i i nput filters 28 volt input C 7 am p fmd28 rev aa - 2014.02.06 crane aerospace & electronics power solutions www.craneae.com/interpoint
angled corner indicates pin one. 1 2 3 4 5 6 12 11 10 9 8 7 0.000 0.050 (1.27) 0.000 0.120 (3.05) 0.250 (6.35) 0.450 (11.43) 0.650 (16.51) 0.850 (21.59) 1.050 (26.67) 1.250 (31.75) 1.380 (35.05) 1.505 (38.23) max. 0.000 0.120 (3.05) 0.250 (6.35) 2.750 (69.85) 2.880 (73.15) 3.005 (76.33) max. 0.128 dia (3.25). 0.040 dia (1.02) 0.23 (5.8) pin length 0.400 (10.16) max. 0.220 (5.59 top view case u flanged case, short-leaded seam seal weight: 77 grams typical case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.3) for two decimal places unless otherwise specified caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300c for 10 seconds per pin. materials header cold rolled steel/nickel/gold cover kovar/nickel pins #52 alloy/gold ceramic seal gold plating of 50 - 150 microinches is included in pin diameter seal hole: 0.120 0.002 (3.05 0.05) case u, rev j, 2014.04.06 please refer to the numerical dimensions for accuracy. f igure 7: c ase u - fmd28-461sl page 7 of 8 fmd28-461 e m i i nput filters 28 volt input C 7 am p fmd28 rev aa - 2014.02.06 crane aerospace & electronics power solutions www.craneae.com/interpoint
s tandard and /es ( non -qml) e nvironmental s creening 1, 2 non -qml t est p erformed s tandard /es pre-cap inspection method 2017, 2032 n n temperature cycle (10 times) method 1010, cond. b, -55c to +125c, ambient n constant acceleration method 2001, 500 g n burn-in method 1015 3 96 hours n final electrical test mil-prf-38534, group a subgroups 1 and 4: +25c case n n hermeticity test fine leak, method 1014, cond. a n gross leak, method 1014, cond. c n gross leak, dip n final visual inspection method 2009 n n test methods are referenced to mil-std-883 as determined by mil-prf-38534. notes: 1. ?non-qml? refers to products that do not offer qml screening. 2. standard and /es, non-qml products, may not meet all of the requirements of mil-prf-38534. 3. burn-in temperature designed to bring the case temperature to the maximum case temperature of the product. refer to the specific product information for the maximum case temperature. burn-in is a powered test. t able 7: e nvironmental s creening Ch igh r eliability s tandard and /es, n on -qml crane aerospace & electronics power solutions quality assurance and certification application note page 11 of 13 app-009 rev ab - 2014.01.28 www.craneae.com/interpoint t able 6: e nvironm ental s creening fmd28-461 emi input filters, fmd28 rev aa - 2014.02.06. this revision supersedes all previous releases. all technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. crane electronics, inc. reserves the right to make changes in products or speci - fications without notice. interpoint is a registered trademark of crane co. and fmd28 series is a trademark of crane electronics, inc. copyright ? 1999 - 2014 crane electronics, inc. all rights reserved. www.craneae.com/interpoint page 8 of 8 fmd28-461 e m i i nput filters 28 volt input 7 am p crane aerospace & electronics power solutions
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