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ART28XXT Datasheet(PDF) 5 Page - International Rectifier |
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ART28XXT Datasheet(HTML) 5 Page - International Rectifier |
5 / 12 page www.irf.com 5 ART28XXT Series Radiation Performance The radiation tolerance characteristics inherent in the ART28XXT converter are the direct result of a carefully planned ground-up design program with specific radiation design goals. After identification of the general circuit topology, a primary task of the design effort was selection of appropriate elements from the list of devices for which extensive radiation effects data was available. By imposing sufficiently large margins on those electrical parameters subject to the degrading effects of radiation, designers were able to select appropriate elements for incorporation into the circuit. Known radiation data was utilized for input to PSPICE and RadSPICE in the generation of circuit performance verification analyses. Thus, electrical performance capability under all environmental conditions including radiation was well understood before first application of power to the inputs. A principal design goal was a converter topology that, because of large design margins, had radiation performance essentially independent of normal elemental lot radiation Completion of first article fabrication, screening and standard environmental testing was followed by radiation testing to confirm design goals. All design goals were met handily and in most cases exceeded by large margin. These test samples were built with elements that, with the foregoing exceptions, were not screened for radiation characteristics. Additional radiation tests on subsequent ART28XXT manufacturing lots provide continued confirmation of the soundness of the design goals as well as justification for the element selection criteria. The following table specifies guaranteed minimum radiation exposure levels tolerated while maintaining specification limits. performance variations. In the few instances where such margins were not assured, element lots were selected from which die were fabricated (and characterized) as radiation hard devices so that realization of the design goals could be assured. Radiation Specification T case = 25°C Test Conditions Min Unit Total Ionizing Dose (2:1 Margin) MIL-STD-883, Method 1019.4 Operating bias applied during exposure 200 krad (Si) Dose Rate Temporary Saturation Survival MIL-STD-883, Method 1021 1E8 1E11 Rads (Si)/sec Heavy Ions (Single event effects) BNL Dual Van de Graf Generator 83 MeV• cm²/mg |
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