11/21/02 www.irf.com 1 advanced analog emi filter afc461 series description 4.0 amp input current - max. 40 db noise reduction min. @100 khz -55c to +125c operation military screening compatible with atw, ahe, ato, atr and ahf series dc/dc converters features afc typical application afc461 emi filter ahe28xx (or other) dc/dc converter +vin +vin in p ut return in p ut return +vout +vout out p ut return out p ut return r l r l system bus ahe28xx (or other) dc/dc converter +vout out p ut return +vin in p ut return case case case to other converters u p to rated out p ut current slv mstr the afc461 emi filter will reduce the input line reflected ripple current of the ahv, ato, atw, atr, and ahf line of dc/dc converters to levels below the ceo3 limits of mil-std-461. these emi filters are manufactured in a facility certified to mil-prf-38534. all purposes used to manufacture these filters have been qualified to enable advanced analog to deliver compliant devices. three standards temperature grades are offered with screening options. refer to part number section. the ch grade filters are fully compliant to mil-prf-38534 for class h. the hb grade converters are processed to mil-prf-38534 screening but do not have class h element evaluation as required by mil-prf-38534. two grades are fully tested and operate over the full military temperature range without derating of output power. a commercial grade is also available. no derating for -55c to +125c operation no tantalum capacitors for high reliability pd - 94585a
2 www.irf.com afc461 series specifications available screening levels and process variations for afc461 series * per commercial standards parameter condition min typ max unit input voltage steady state 0 28 40 vdc input current dc ripple 4.0 1.0 amps amps rms input clamping voltage -55c +25c +125c 38.9 42.3 44.9 43.2 47.0 49.9 47.5 51.7 54.8 vdc vdc vdc output voltage 1 steady state v out = v in - i in (r dc ) vdc output current steady state 4.0 amps dc resistance (r dc ) steady state 0.07 0.10 0.15 ohms power dissipation max. dc current 1.6 watts noise reduction 100 khz to 50 mhz 40 db capacitance any pin to case 4200 pf isolation any pin to case 500vdc 100 m ? operating temperature storage temperature case case -55 -65 +125 +150 c c weight 39 grams requirement mil-std-883 method no suffix es suffix hb suffix ch suffix temperature range -20 to +85c -55c to +125c -55c to +125c -55c to +125c element evaluation mil-prf-38534 internal visual 2017 yes yes yes temperature cycle 1010 cond b cond c cond c constant acceleration 2001 500g cond a cond a burn-in 1015 48hrs @ 85 c 96hrs @ 125c 160hrs @ 125c 160hrs @ 125c final electrical (group a) mil-prf-38534 25c 25c -55, +25, +125c -55, +25, +125c seal, fine & gross 1014 cond a, c cond a, c cond a, c external visual 2009 yes yes yes 1. typical applications result in vout within 2 % of vin 48hrs
www.irf.com 3 afc461 series device synchronization whenever multiple dc/dc converters are utilized in a single system, significant low frequency noise may be generated due to slight difference in the switch- ing frequencies of the converters (beat frequency noise). because of the low frequency nature of this noise (typically less than 10khz), it is difficult to filter out and may interfere with proper operation of sensi- tive systems (communications, radar or telemetry). advanced analog offers an option, which provides synchronization of multiple ahe/atw type convert- ers, thus eliminating this type of noise. to take ad- vantage of this capability, the system designer must assign one of the converters as the master. then, by definition, the remaining converters become slaves and will operate at the masters? switching frequency. the user should be aware that the synchronization system is fail-safe; that is, the slaves will be continue operating should the master frequency be inter- rupted for any reason. the layout must be such that the synchronization output of the master device is connected to the synchronization input of each slave device. it is advisable to keep this run short to mini- mize the possibility of radiating the 250khz switch- ing frequency. a typical connection is illustrated on the cover sheet of this document. the appropriate converters must be ordered to take advantage of this feature. after selecting the con- verters required for the system, a ?mstr? suffix is added for the master converter part number and an ?slv? suffix is added for slave part number. see part number section of the applicable converter data sheets. afc461 block diagram 1 5 3 2 4 11 f 0.2 ? 11 f 0.2 ? 1800 p fd 1800 p fd 1n5649a 10 h5 h 0.1 f refer to last page for pin desination
4 www.irf.com afc461 series pin designation part numbering world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 322 3331 advanced analog: 2270 martin av., santa clara, california 95050, tel: (408) 727-0500 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 11/02 afc 461 f / ch model applicable military test standard case style omit for standard screenin g ? , es, hb, ch pin no. designation 1 + vin 2 + vout 3 case 4 output return 5 input return available standard miliatary drawing (smd) cross reference standard military drawing pin vendor cage code vendor similar pin 91020-01hxa 52467 afc461/ch 91020-01hza 52467 afc461f/ch afc461 case outlines 1.120 max (28.45) 0.040 d (1.02) x 0.26 l (6.60) pins 1.600 (40.64) 2.120 max (53.85) 0.380 max (9.65) 1 2 0.800 (20.32) 4 5 3 2.550 (64.77) 1.110 (28.19) 0.040 d (1.02) x 0.26 l (6.60) pins 1.600 (40.64) 2.870 (72.90) max 2.110 (53.59) max 0.380 (9.65) max 0.050 (1.27) 1 2 0.800 (20.32) ? 0.162 (4.12) 2 holes 4 5 3 non-flanged flanged
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