www.irf.com 1 emi filter afv461 series description 4.0 amp input current - max. 40 db noise reduction min. @100 khz -55c to +125c operation military screening compatible with all stanard 28 volts input dc/dc converters features afv typical application no derating for -55c to +125c operation no tantalum capacitors for high reliability afv461 emi filter ahv28xx (or other) dc/dc converter +vin +vin input return input return +vout +vout output return output return r l r l system bus ahv28xx (or other) dc/dc converter +vout output return +vin input return case case case to other converters up to rated output current the afv461 emi filter will reduce the input line reflected ripple current of all dc/dc converter families to levels below the ceo3 limits of mil- std-461. this filter is intended for applications requiring compatibility to mil- std-704a. these emi filters are manufactured in a facility certified to mil-prf-38534 and are available with military screening. four grades are offered with different screening options. refer to part number section . pd-94586b
2 www.irf.com afv461 series specifications available screening levels and process variations for afv461 series * per commercial standards 1. typical applications result in vout within 2 % of vin input voltage 50v dc lead temperature (soldering, 10s) +300c input current 4.0a operating case temperature -55 c to +125 c input ripple 1.0a storage temperature -65c to +150c power dissipation 4.0w absolute maximum ratings 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 48hrs @ 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 parameter condition min typ max unit input voltage steady state transient, 1 second 0 28 40 80 vdc input current dc ripple 4.0 1.0 a a rms output voltage 1 steady state v out = v in - i in (r dc ) vdc output current steady state 4.0 a dc resistance (r dc ) steady state 0.07 0.10 0.15 ? noise reduction 100 khz to 50 mhz 40 db capacitance any pin to case 4200 pf isolation any pin to case 500vdc 100 m ? weight 39 g
www.irf.com 3 afv461 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 switching 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 sensitive systems (communications, radar or telemetry). international rectifier offers an option, which provides synchronization of multiple ahe/atw type converters, thus eliminating this type of noise. to take advantage 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 continue operating should the master frequency be interrupted 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 minimize the possibility of radiating the 250khz switching 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 converters 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. afv461 block diagram 1 5 3 2 4 11f 0.2 ? 11f 0.2 ? 1800 pfd 1800 pfd 10h 5h refer to last page for pin designation
4 www.irf.com afv461 series pin designation part numbering world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 322 3331 ir santa clara: 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. 06/05 pin no. designation 1 + vin 2 + vout 3 case 4 output return 5 input return available standard military drawing (smd) cross reference afv461 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 standard military drawing pin vendor cage number vendor similar pin 91020-02hxa 52467 afv461/ch 91020-02hza 52467 AFV461F/ch afv 461 f / ch model applicable military test standard case style omit for standard screening blank, es, hb, ch
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