b5-7 description the msf-461 emi filter module has been specifically designed to reduce the input line reflected ripple current of interpoints 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. mil-std n oise m ana gement 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. f ilter o peration the msf-461 filters are rated to operate, with no degradation of performance, over the temperature range of C5 c to +85 c (as measured at the baseplate). above 85, input voltage and current must be derated as specified in erating?n 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. 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 msf emi filter 0.8 amp f eatures ? C5?to +85? peration ? 50 db minimum attenuation at 500 khz ? compliant to mil-std-461c, ce03 ? overvoltage protection s ize (max.): 1.075 x 1.075 x 0.370 (27.31 x 27.31 x 9.40 mm) s ee 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
recommended operating conditions typical characteristics derating a bsolute maximum ratings input voltage ? 0 to 40 vdc continuous lead soldering temperature (10 sec per lead) ? 300 storage temperature range (case) ? C5?to +125? b5-8 msf emi filter 0.8 amp input voltage range ? 0 to 40 vdc continuous case operating temperature (tc) ? C5?to +85? ull power electrical characteristics: 25 tc, nominal vin, unless otherwise specified. emi i nput f ilters capacitance ? 6600 pf max, any pin to case isolation ? 100 megohm minimum at 500 v ? any pin to case, except case pin f igure 1: s chema tic msf-461 parameter conditions min typ max units input voltage continuous 0 28 40 vdc input c lamping C5? 38.9 43.2 47.5 vol tage 25 42.3 47.0 51.7 vdc 85 44.9 49.9 54.8 input current 420 ma dc noise rejection 50 db dc resistance 1 (r dc ) tc = 25 3.00 3.20 3.50 output vol t age 2 steady st a te v out = v in - i in (r dc ) vdc output current steady state, 28 vin 420 ma internal power dissipation maximum current 0.62 w notes 1. dc resistance measured using four wire technique. 2. t ypical applications result in vout within 5% of vin. input voltage derate linearly from 100% at 85 case to the 33 vdc at 125 case dc input and output current derate linearly from 100% at 85 case to 150 ma at 125 case. 0.01 m f 0.001 m f 100 v 1000 pf
500 v positive
input input
common positive
output output
common msf-461 570 m h x4 x2 50 v 1000 pf
500 v x2 x2 4.7 m f
pin out b5-9 model numbering key emi i nput f ilters see section b8, case c3, for dimensions. pin designation 1, 2 1 input common 3, 4 1 positive input 5, 6 1 positive output 7 case ground 8, 9 1 output common f igure 3: p in o ut msf emi filter 0.8 amp f igure 2: c onnection d iagram note 1. make external connections to both pins. msf - 461 / es base model mil-std-461 reference screening (standard screening has no designator
in this position.) + vin + vout input
common o utput
common case
r l m sf-461 m sr converter +vin +vout i nput
common output
c ommon case
+ 1, 2 3, 4 5, 6 1 , 2 7 4 8, 9 17, 18 12, 13 8, 9 dot on top of cover
indicates pin one. bottom view
msf 12 4 5 9 6 7 8 3
b5-10 typical performance curves: 25 tc , nominal vin, unless otherwise specified. emi i nput f ilters msf emi filter 0.8 amp f igure 4 f igure 5 narrowband spectrum of an msr2812d converter without an emi filter. narrowband spectrum of an msr2812d converter with an msf-461 filter on the input line. msf rev b 20060307 (output current correction). 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. copyright 1994 - 2006 interpoint. all rights reserved. 9 0 70
50 30 .015
.1
1 10 50 10 e m i s s i o n l e v e l ( d m a ) frequency (mhz)
ce03 limit 90 70
50 30 .015
.1
1 10 50 10 e m i s s i o n l e v e l ( d m a ) frequency (mhz)
ce03 limit
b8-8 case c c ases case c bottom view see figures 9 - 11 for pin configurations. 1.075 max (27.31) materials header case c1 cold rolled steel/nickel/gold cases c2 and c3 kovar/nickel/tin cover case c1 cold rolled steel/nickel cases c2 and c3 kovar/nickel/tin pins case c1 copper/nickel/gold cases c2 and c3 kovar/nickel/gold, matched glass seal 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 1.075 max (27.31) caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300 c for 10 seconds per pin. dot on top of case indicates pin one 0.000 0.132 (3.35) 0.932 (23.67) 0.000 0.132 (3.35) 876 5 4 3 2 1 0.332 (8.43) 0.532 (13.51) 0.732 (18.59) 0.932 (23.67) 0.025 (0.64) dia. 0.000 0.270 max. (6.86) msa series: screening e standard, es, or 883 smsa series: screening e space standard, h, or k bottom view case c1 0.205 0.010 (5.21 0.25) 0.000 0.270 max. (6.86) 0.205 0.010 (5.21 0.25) projection weld seam seal squared corner and dot on top of case indicate pin one. 12 9 10 17 18 0.018 0.002 dia. (0.46 0.05) 0.350 (8.89) 0.000 pins equally spaced marker bead on pin 18 msr series: screening e standard or es hr40 series: no screening options bottom view case c2 0.205 0.010 (5.21 0.25) dot on top of case indicates pin one 0.100 (2.54) 0.370 max. (9.40) 0.800 (20.32) 0.800 (20.32 12 4 5 9 0.018 0.002 dia. (0.46 0.05) 6 7 msf emi filter: screening e standard or es 8 bottom view case c3 0.350 (8.89) 0.000 0.370 max. (9.40) 0.205 0.010 (5.21 0.25) dot on top of case indicates pin one 0.100 (2.54) 0.800 (20.32) 0.800 (20.32 0.600 (15.24) 0.300 (7.62) 3 0.000 0.365 max. (9.27) 0.205 0.010 (5.21 0.25) seam seal f igure 9: c ase c1 f igure 10: c ase c2 f igure 11: c ase c3 f igure 8: c ase c m aximum d imensions note: although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. please refer to the numerical dimen- sions for accuracy.
c2-12 qa screening 85? products test (85? products excluding hr products) standard /es pre-cap inspection method 2017 yes yes temperature cycle (10 times) method 1010, cond. b, -55? to 125? no yes constant acceleration method 2001, 500 g no yes burn-in 96 hours at 70? ambient (typical) no yes final electrical test mil-prf-38534, group a subgroups 1 and 4: +25? case yes yes hermeticity testing fine leak, method 1014, cond. a no yes gross leak, method 1014, cond. c no yes gross leak, dip (1 x 10 -3 ) yes no final visual inspection method 2009 yes yes test methods are referenced to mil-std-883 as determined by mil-prf-38534. mfw series mtw series mhe/mlp series mhl series mrh series mto series msr series dch series fm/fma/fmb emi filters msf emi filter 85? p roducts applies to the following products:
|
