fm-704a emi input filter and transient suppression module crane aerospace & electronics power solutions crane aerospace & electronics, interpoint corp. po box 97005 ? redmond wa 98073-9705 425.882.3100 ? electronics@craneae.com www .craneae.com page 1 of 8 rev b - 20060125 description interpoints 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 ana gement 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. t o meet mil-std-1275a and mil-std-704a requirements, derate output power linearly from 40 watts at 105 c 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 o wer d issip ation 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 v in 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 filters 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 of f 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 of f 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. f eatures ? C5?to +125? peration ? 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 model fm-704a 40 watts
fm-704a emi input filter and transient suppression module crane aerospace & electronics power solutions page 2 of 8 rev b - 20060125 www .craneae.com o perating conditions and characteristics input voltage range ? 16 to 40 vdc continuous for 40 w load lead soldering temperature (10 sec per pin) ? 300 storage temperature range (case) ? C5?to +150? case operating temperature (tc) ? C5?to +125? ull power derating output power/current ? linearly from 40 w at 105 to 25 w at 125?to meet mil-std-1275a (at) and mil-std-704a 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 mechanical and environmental size (maximum) 2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm) see case k1 for dimensions. weight (maximum) 40 grams typical screening standard, es, or 883 (class h). see a screening: /883 (class h, qml)for more information. 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 C t ypical v alues 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 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 mf 3300
pf 15 v 3300 pf / 500v 390 m h inhibit oscillator 3300 pf
500v 6600 pf
500v case
fm-704a emi input filter and transient suppression module crane aerospace & electronics power solutions page 3 of 8 rev b - 20060125 www .craneae.com see case k1 for dimensions. p in 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 pin out p ins not in use 12 4 5 bottom view
fm-704a dot on top of package indicates pin one 3 6
fm-704a emi input filter and transient suppression module crane aerospace & electronics power solutions page 4 of 8 rev b - 20060125 www .craneae.com m odel numbering key d scc 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 md/dscc lists?or more informa- tion. model selection fm 704a base model mil-std-461 ref. case option screening choose one from each of the following rows case option case k1 screening standard screening, leave blank /es (es screening), /883 (class h, qml) f m - 704a / 883 b ase model mil-std-704a reference screening (standard screening has no designator
i n this position.)
fm-704a emi input filter and transient suppression module crane aerospace & electronics power solutions page 5 of 8 rev b - 20060125 www .craneae.com 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 i nhibited 2 input surge 40 w, 100 v, 0.5 z s , 60 ms 1 42 48 v o ut input spike 40 w, 400 v, 0.5 z s , 5 s 2 48 v o ut 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 = 25c 0.45 output voltage steady state v out = v in - i in (r dc ) v dc inhibited 1 output current 16 v i n 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. electrical characteristics: 25 tc, nominal vin, unless otherwise specified.
fm-704a emi input filter and transient suppression module crane aerospace & electronics power solutions page 6 of 8 rev b - 20060125 www .craneae.com f igure 6 f igure 8 f igure 3 f igure 4 f igure 7 f igure 5 f igure 9 mhf+ converter without filter mhf+ converter with fm-704a filter maximum allowed internal power dissipation 105 c case temperature derate power linearly to 50% at 125. operation below this curve ensures a maximum junction temperature rise of 40 c or less. differential mode response inrush current t ypical output impedance (z) w ith input shorted undervoltage lockout typical performance curves: 25 tc , nominal vin, unless otherwise specified. C0 C 20 0 20 f requency (hz) 10 k 100 k 1 m -80 g a i n ( d b ) C0 0.10 1.00 10.00
frequency (hz) 1 k 10 k 100 k 1 m 0.01
i m p e d a n c e ( z , o h m s ) 1 a / d i v . 5 ms / div. fmC04a 15 watt load 10 1000 100 0.1 1 10 100 1000 w a t t s time (ms) 90 7 0 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
0.1
1 10 50 10 e m i s s i o n l e v e l ( d m a ) frequency (mhz)
5 v / d i v . 100 ms / div. fmC04a 0 volts
for v out v in v out v i n and v o ut
fm-704a emi input filter and trans. suppression module cases crane aerospace & electronics power solutions page 7 of 8 rev b - 20060125 www .craneae.com
FM704A emi input filter. rev b - 20060125. this revision supercedes all previous releases. 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. smfl series is a trademark of interpoint. copyright 1992 - 2006 interpoint corporation. all rights reserved. www.craneae.com page 8 of 8 quality assurance crane aerospace & electronics power solutions test 125 125 class h standard /es /883 non-qml non-qml qml pre-cap inspection method 2017, 2032 yes yes yes t emperature cycle (10 times) method 1010, cond. c, -65 to 150? ambient no no yes method 1010, cond. b, -55 to 125? 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 125 case, typical no no yes 96 hours at 125 case, typical no yes no final electrical t est mil-prf-38534, group a subgroups 1 through 6: -55 c, +25 c, +125 case no no yes subgroups 1 and 4: +25 c 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. 883, c lass h, qml s creening
|
