b3-3 description interpoint s fm-704a emi filter and transient suppression module combines emi filtering and transient protection to handle the demanding requirements of military, aerospace and industrial appli- cations. as an emi filter the fm-704a filter reduces the reflected ripple current from dc/dc switching converters. as a protection module, it suppresses input transients on the power bus to protect the converter and other downstream components. mil-std n oise m anagement when used in conjunction with interpoint converters, the fm-704a emi filter reduces reflected input ripple current by a minimum of 60 db at 500 khz and 55 db at 1 mhz (see figures and electrical characteristics table). this attenuation gives the converter/filter combination performance exceeding mil-std-461c s ce03 test. although the fm-704a filter effectively attenuates the ripple gener- ated by switching converters, it will not suppress rf applied to its input terminals. t emperature o peration fm-704a filters are rated to operate from -55? to +125? base- plate temperature. to meet mil-std-1275a and mil-std-704a requirements, derate output power linearly from 40 watts at 105? to 25 watts at 125?. see figure 9. p rotection to provide protection for itself and converters, the fm-704a filter blocks transients as required by the following standards: mil-std-704a panavia sp-p-90001 mil-std-461b&c british standard bs3g100 mil-std-1275 civil aircraft d0160b refer to the electrical characteristics table on the following page for more information. reverse polarity spikes of up to 100 v will not damage the filter, however the spikes will not be blocked by the filter. i nternal p ower d issipation to keep internal power dissipation to safe operating levels, the input current should never exceed 2.5 amps at 16 vin or 1.0 amp at 40 vin. when the fm-704a filter is used with pwm (pulse width modulated) converters, i line will vary as power / v line and 2.5 amps maximum at 16 vin will reduce to approximately 1 amp maximum at 40 vin. the maximum value allowed may be less than 1 amp as determined by line transients and the safe operating area of figure 9. figure 9 illustrates the maximum allowed internal dissipation for the fm-704a filter. to calculate watts dissipated, subtract 40 volts from the transient (vt) to determine the maximum voltage across the filter and multiply the result by the current (the filter s output power, pout divided by 40). w = (v t - 40) x p out /40 for example, with 20 watts output and a transient of 400 volts: w = (400 - 40) x 20/40 = 180 the curve of figure 9 shows that 180 w can be dissipated for up to 4 milliseconds. f eatures the inhibit function allows the fm-704a filter to be used as a high- side switch. when the inhibit terminal (pin 6) is left open or pulled high, the fm-704a filter is enabled. when the terminal is grounded, the filter shuts off output power. a soft start function helps reduce inrush current and start-up over- shoot when the filter is initially powered or when it is released from the inhibit mode. an undervoltage lockout feature shuts off output power when input voltage falls below a specified level. refer to figure 8 for more infor- mation. 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 and t ransient s uppression m odule , 28 v olt i nput fm-704a emi filter 40 watt f eatures ?5? to +125? operation 16 to 40 vdc input up to 60 db attenuation at 500 khz. active transient suppression undervoltage lockout inhibit function ?compliant to mil-std-461c, ce03 size (max): 2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm) see section b8, case k1, for dimensions. weight: 40 grams maximum screening: standard, es, or 883 (class h). see section c2 for screening options, see section a5 for ordering information. model fm-704a 40 watts
absolute maximum ratings inhibit recommended operating conditions typical characteristics input voltage 16 to 40 vdc continuous for 40 w load lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +150? b3-4 fm-704a emi filter 40 watt input voltage range 16 to 40 vdc continuous for 40 w load case operating temperature (tc) ?5? to +125? derating output power linearly from 40 w at 105? to 25 w at 125? to meet mil-std-1275a (at) and mil-std-704a electrical characteristics: 25? tc, nominal vin, unless otherwise specified. emi i nput f ilters capacitance 0.017 f max, any pin to case undervoltage lockout 7 vdc min, 15 vdc max isolation 100 megohm minimum at 500 v any pin to case, except case pin inhibit pin voltage (unit enabled) ?5.5 v max inhibit ttl open collector logic low (output disabled) logic low voltage 0.8 v logic low inhibit pin current 0.6 ma max referenced to input common logic high (output enabled) open collector fm-704a parameter conditions min typ max units input voltage no load 0 28 40 40 w load 16 28 40 vdc undervoltage lockout 7 15 input current 16 v in 2.5 a 40 v in 1.0 no load 5 ma inhibited 2 input surge 40 w, 100 v, 0.5 z s , 60 ms 1 42 48 v out input spike 40 w, 400 v, 0.5 z s , 5 s 2 48 v out 40 w, 600 v, 50 z s , 10 s 3 48 differential mode 500 khz 60 db noise rejection 1 mhz 55 dc resistance (r dc ) tc = 25? 0.45 output voltage steady state v out = v in - i in (r dc ) vdc inhibited 1 output current 16 v in 2.5 a 40 v in 1.0 internal power peak dissipation 105? 1000 125? 500 w continuous ( > 10 sec.) 105? 30 125? 15 notes 1. meets mil-std-1275a (at) surge and figure 8 and 9 of mil-std-704a. for these standards derate output power linearly from 40 w at 105? to 25 w at 125?. 2. meets panavia sp-p-90001, british standard bs3g100 and civil aircraft d0160 standards. 3. meets mil-std-461c 1.2 cs06 limits.
model numbering key pin out 12 4 5 bottom view fm-704a dot on top of package indicates pin one 3 6 fm - 704a / 883 base model mil-std-704a reference screening (standard screening has no designator in this position.) b3-5 emi i nput f ilters see section b8, case k1 for dimensions. pin designation 1 positive input 2 positive output 3 case ground 4 output common 5 input common 6 inhibit f igure 2: p in o ut dscc number dscc d rawing (5915) 94028-01hxc fm-704a f ilter s imilar p art fm-704a/883 for exact specifications for a dscc product, refer to the dscc drawing. see section a3, ?md/dscc lists? for more information. 0.068 m f positive input input common positive output output common fm-704a 3.6 m h 6 m f 25 v 3.6 m h 6 m f 3300 pf 15 v 3300 pf / 500v 390 m h inhibit oscillator 3300 pf 500v 6600 pf 500v case 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. f igure 1: s chematic ?t ypical v alues fm-704a emi filter 40 watt
b3-6 typical performance curves: 25? tc , nominal vin, unless otherwise specified. emi i nput f ilters fm-704a emi filter 40 watt f igure 6 f igure 8 1 a / div. 5 ms / div. fm?04a 15 watt load 5 v/ div. 100 ms / div. fm?04a 0 volts for v out v in v out v in and v out 90 70 50 30 .015 0.1 1 10 50 10 emission level (dma) frequency ( mhz ) f igure 3 90 70 50 30 .015 .1 1 10 50 10 emission level (dma) frequency (mhz) ce03 limit f igure 4 0.10 1.00 10.00 frequency (hz) 1 k 10 k 100 k 1 m 0.01 impedance (z, ohms) f igure 7 f igure 5 ?0 ?0 0 20 frequency (hz) 10 k 100 k 1 m -80 gain (db) ?0 10 1000 100 0.1 1 10 100 1000 watts time (ms) f igure 9 mhf+ converter without filter mhf+ converter with fm-704a filter maximum allowed internal power dissipation 105? case temperature derate power linearly to 50% at 125?. operation below this curve ensures a maximum junction temperature rise of 40? or less. differential mode response inrush current typical output impedance (z) with input shorted undervoltage lockout 25021-001-dts rev a dq# 4001 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. fm-704a is a trademark of interpoint. copyright 1992 - 1999 interpoint. all rights reserved.
b8-26 case k c ases materials header case k1 - k3 cold rolled steel/nickel/gold cases k4 - k8 cold rolled steel/nickel/tin cover case k1 - k3 kovar/nickel case k4 - k8 cold rolled steel/nickel/tin pins #52 alloy (all cases) case k1, k2, and k3 (except mhv series single and dual) ceramic seal cases k4 - k8 and mhv series single and dual (k3) compression glass seal case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.2) for two decimal places unless otherwise specified case k bottom view see figures 42 - 48 for pin configuration 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. flange thickness: cases k1, k2, k3 and mlp series (k5) 0.060 (1.52) cases k4, k5 (except mlp series), k6, k7, and k8 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) 1.125 max (28.58) 2.910 max (73.91) dot on top of case indicates pin one f igure 41: c ase k m aximum d imensions
b8-27 case k c ases 0.155 (3.94) 0.955 (24.26) 0.000 0.040 dia (1.02) 0.000 0.000 0.400 max. (10.16) 0.25 0.03 (6.4 0.8) 0.555 (14.1) 0.245 (6.22) 1.845 (46.86) 1.110 (28.19) 12 4 5 flanged case fm-704a emi filter: screening ?standard, es, or 883 bottom view case k1 0.162 dia (4.11) seam seal 0.230 (5.84) 2.320 (58.93) dot on top of case indicates pin one 3 6 f igure 42: c ase k1 0.155 (3.94) 0.955 (24.26) seam seal 0.000 0.040 dia (1.02) 0.000 0.000 0.400 max. (10.16) 0.25 0.03 (6.4 0.8) 0.555 (14.1) 0.245 (6.22) 1.845 (46.86) 2.090 (53.01) 1.110 (28.19) 12 4 5 flanged cases: designator required in case option position of model number. fmc emi filter: screening ?standard, es, or 883 sfmc emi filter: screening ?space standard, h, or k bottom view case k2 0.162 dia (4.11) 0.230 (5.84) 2.320 (58.93) dot on top of case indicates pin one 3 f igure 43: c ase k2
c2-10 test (125? products) standard /es /883 (class h)* pre-cap inspection method 2017, 2032 yes yes yes temperature cycle (10 times) method 1010, cond. c, -65? to 150? no no yes method 1010, cond. b, -55? to 125? no yes no constant acceleration method 2001, 3000 g no no yes method 2001, 500 g no yes no burn-in method 1015, 160 hours at 125? no no yes 96 hours at 125? case (typical) no yes no final electrical test mil-prf-38534, group a subgroups 1 through 6: -55?, +25?, +125? no no yes subgroups 1 and 4: +25? case yes yes no hermeticity testing 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. *883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature range of ?5? to +125?. mor series mflhp series mfl series mhp series mtr series mqo series** mhd series mhv series mhf+ series mhf series** mga series msa series mgh series mch series fm-704a emi filter fmd**/fme emi filter fmc emi filter fmh emi filter fmga emi filter fmsa emi filter hum modules** lcm modules** lim modules qa screening 125? products 125? p roducts applies to the following products **mflhp series, mqo series, mhf series, fmd emi filters, hum modules, and lcm modules do not offer ?83?screening.
|
