| VDMOS is a high-power switching device commonly used in spacecrafts,and also a key component of the power and thermal control systems in spacecrafts.With the increasing demand of new spacecrafts on high-performance domestic components,using domestic VDMOS for satellites is inevitable.However,there is a lack of reliability data based on the application of domestic VDMOS,making it difficult to provide a comprehensive application guide for the designers.We compared 4 imported or domestic VDMOS used for spacecrafts by investigating the total ionizing does effects and single event effects of VDMOS.The key parameters such as threshold voltage and leakage current under 60Co?-ray and heavy–ion irradiation were measured.Benchmarked against the spacecraft model required by Shanghai Academy of Spaceflight Technology,the anti-radiation performance of the VDMOS was evaluated.Based on the typical application status,the thermal vacuum test of VDMOS on plate was conducted to explore the dependance of the working voltage,current and switching frequency of the domestic RCS7422SAU1 on the temperature in+70?thermal vacuum environment.A lot of reliability data has been obtained through the above research to promote the application of domestic VDMOS in satellite.At the same time,the results can be used for the standard setting of Shanghai Academy of Spaceflight Technology,which will provide a guidance for the designers to use china-made devices effectively.The study has revealed that the domestic PMOS named RCS7422SAU1 performs well under radiation with total ionizing does of100 krad(Si).Under radiation with heavy–ion of 99.8MeV·cm~2/mg,the working voltage of RCS7422SAU1 reaches-100V when its gate voltage is0V or+5V.Under the same working voltage,current and switching frequency,the temperature rise of RCS7422SAU1'case is below than imported VDMOS named IRHN9150.So the domestic PMOS named RCS7422SAU1 can meet the requirements of GEO trajectory. |
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