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07/25/03 www.irf.com 1 advanced analog radiation tolerant dc/dc converters description 12 watts output power available in 3.3, 5, 12 and 15 volt outputs 16 - 40 vdc input range (28 vdc nominal) low input/output noise total ionizing dose > 25krads (si) no see to let > 60 mev-cm 2 /mg -55c to +125c operating range indefinite short circuit protection flexible mounting high power density fully isolated - input to output and to case complimentary emi filter available synchronizable from an external source electrical performance similar to ahf28xxs series features amf 28v input, single output the amf28xxs series of dc/dc converter modules has been specifically designed for operation in moder- ate radiation environments supplementing the higher radiation performance available in the advanced ana- log art, arh and g-series converters. environ- ments presented to space vehicles operating in low earth orbits, launch boosters, orbiting space stations and similar applications requiring a low power, high performance converter with moderate radiation hard- ness performance will be optimally served by the amf28xxs series. the amf28xxs has been designed for high density using chip and wire hybrid technology that complies with the class h requirements of mil-prf-38534. fin- ished product are fabricated in a facility fully qualified to mil-prf-38534. the standard processing adopted for the amf28xxs meets the requirements of mil-prf- 38534 for class h but with enhanced screening steps and includes element evaluation. applicable generic lot qualification test data including radiation perfor- mance can be made available on request. consult advanced analog for special requirements. amf28xxs series pd - 94689 the physical configuration of the amf28xxs series permits mounting directly to a heat dissipation surface without the necessity of signal leads penetrating the heat sink surface. this package configuration permits greater independence in mounting and more mechani- cal security than traditional packages. advanced analog?s rugged ceramic seal pins are used exclusively in the package thereby assuring long term hermeticity.
2 www.irf.com amf28xxs series specifications for notes to specifications, refer to page 5 static characteristics -55c t case +125c, v in =28 v dc 5%, c l =0, unless otherwise specified.

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www.irf.com 3 amf28xxs series static characteristics (continued) -55c t case +125c, v in =28 v dc 5%, c l =0, unless otherwise specified. for notes to specifications, refer to page 5

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4 www.irf.com amf28xxs series dynamic characteristics -55c t case +125c, v in =28 v dc 5%, c l =0, unless otherwise specified. for notes to specifications, refer to page 5

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www.irf.com 5 amf28xxs series amf28xxs block diagram application information inhibit function emi filter device synchronization notes to specifications connecting the enable input (pin 1) to input common (pin 7) will cause the converter to shut down. it is recommended that the enable pin be driven by an open collector device capable of sinking at least 400 a of current. the open circuit voltage of the en- able input is 10.0 +1 v dc . an optional emi filter is available (afh461) that will reduce the input ripple current to levels below the limits imposed by mil-std-461 ce03. when multiple dc/dc converters are utilized in a single system, significant low frequency noise may be generated due to a small difference in the switch- ing frequency of the converters (beat frequency noise). because of the low frequency nature of this noise (typically less than 10 khz), it is difficult to filter out and may interfere with proper operation of sensitive systems (communication, radar or telem- etry). advanced analog provides synchronization of multiple amf type converters to match switching frequency of the converter to the frequency of the system clock, thus eliminating this type of noise. 3 4 +vout return pulse width modulator primary housekeeping supply emi filter under-voltage detector 8 1 2 7 +input enable sync input return error amp & ref fb cs drive 6 case 1 parameter guaranteed by line and load regulation tests. 2 bandwidth guaranteed by design. tested for 20 hz to 2 mhz. 3 capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in exce ss of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuit ry, appearing as a short circuit during turn on. 4 parameter shall be tested as part of design characterization and after design or process changes. therefore this parameters shall be guaranteed to the limit specified. 5 load step transition time between 2 and 10 microseconds. 6 recovery time is measured from the initiation of the transient to where v out has returned to within 1 % of v out at 50 percent load. 7 input step transition time between 1 and 10 microseconds. parameter guaranteed by design but not 100% tested. 8 turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal fro m the inhibit pin while power is applied to the input.
6 www.irf.com amf28xxs series standard process screening for amf28xxs series (!"* !"" radiation specification )
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www.irf.com 7 amf28xxs series 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. 07/03 amf28xxs case outline part numbering pin designation 1.600 1.850 1.380 1.130 ? 0.140 0.19 8 1 6 7 2345 0.600 0.800 1.000 0.400 0.03d x 0.25l 8 pins 2.10 0.33 0.17 6 ' a9! <#*-+ (b!+-+ +-+2 8g2 2!d"+ *-+ !+" (b!*-+ tolerance unless otherwise specified: x.xx 0.010 x.xxx 0.005 amf 28 05 s / em model input volta g e 28 = 28v outputs s = single d = dual output volta g e 03r3 = 3.3v, 05 = 5v, 12 = 12v, 15 = 15v screenin g blank = flight model (ch+) /em = engineering model

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