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07/25/03 www.irf.com 1 advanced analog radiation tolerant dc/dc converters description 5 watts output power available in 5, 12 and 15 volt outputs 16 - 40 vdc input range (28 vdc nominal) 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 fully isolated - input to output and to case complimentary emi filter available electrical performance similar to asa28xxd series features ama 28v input, dual output the amd28xxd 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 art2815t converter series. environments pre- sented 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 hardness perfor- mance will be optimally served by the ama28xxd se- ries. the ama28xxd 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 will be fabricated in a facility fully quali- fied to mil-prf-38534. the standard processing adopted for the ama28xxd is an enhancement of the requirements of mil-prf-38534 for class h and in- cludes element evaluation. applicable generic lot quali- fication test data including radiation performance can be made available on request. variations to the stan- dard screening can be accomodated. consult ad- vanced analog for special requirements. ama28xxd series pd - 94692 the physical configuration of the ama28xxd series permits mounting directly to a heat conduction 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 ama28xxd series specifications for notes to specifications, refer to page 4 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 ama28xxd 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 4

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4 www.irf.com ama28xxd series dynamic characteristics -55c t case +125c, v in =28 v dc 5%, c l =0, unless otherwise specified. notes to specifications 1. applicable to positive and negative outputs. 2. maximum combined output is 5 watts. 4 watts (max.) is available from either output (80%). 3. load current split equally between +v out and ?v out . 4. 1.0 watt load on output under test, 1.0 watt to 4.0 watt load change on other output. 5. capacitive value may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. 6. parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limit specified. 7. load step transition time between 2 and 10 microseconds. 8. recovery time is measured from initiation of the transient to where v out has returned to within 1% of v out at 50% load. 9. input step transient time between 1 and 10 microseconds. 10. turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin while power is applied to the input.

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www.irf.com 5 ama28xxd series ama28xxd block diagram application information inhibit function connecting the enable input (pin 5) 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 inhibit input is 10.0 +1 v dc . an optional emi filter is available (asf461 or afh461) will reduce the input ripple current to levels below the limits imposed by mil-std-461 ce03. emi filter c ontroller error am p lifier 1 2 8 6 7 5 case return +out p ut enable return +in p ut 3 -o ut p ut cs housekeeping supply thermal consideration s irrespective of the fact that the ama28xxd series of converters are relatively low power devices and are designed to provide efficient voltage conver- sion, there will be some heat generated during nor- mal operation. to avoid a continuous thermal rise that may eventually exceed the maximum case tem- perature rating and to maintain a safe operating environment for the internal components, these converters should be attached to a heat conduct- ing surface allowing a continuous flow of the heat away from the base plate. this becomes more im- portant when operating in the near vacuum envi- ronment of space which provides no alternate heat radiating path.
6 www.irf.com ama28xxd series standard process screening for ama28xxd series radiation specification ? (

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www.irf.com 7 ama28xxd 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 part numbering pin designation 1.380 0.125 0.880 ? 0.140 x 3 0.25 typ 68 7 1 2 3 5 1.130 1.130 1.63 0.200 0.400 0.800 0.17 0.33 0.170 0.26 t yp 0.030 dia ama28xxd case outline 3 ' (@' . ' ! 9
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d ama 28 05 d / em model input volta g e 28 = 28v outputs s = single d = dual output volta g e 05 = 5v, 12 = 12v 15 = 15v screenin g blank = flight model (ch+) /em = engineering model tolerance unless otherwise specified: x.xx 0.010 x.xxx 0.005

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