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Research of Radiation Effect on DC/DC Buck Converter under High Dose Rate

DC/DC Buck Converters were exposed under high dose rate radiation, whose key parameters were recorded and analyzed by a appropriative test system. The results showed that the input current of the DC/DC Buck Converters increased with radiation dose, and there would be a fatal failure when the input current increase sharply. It was found that the VDMOS is the key causation for the abnormal phenomena. It is concluded that when the input voltage was fixed, a heavy load could lead a failure more easily, analogous, when the load was fixed, a high input voltage could lead to a failure more easily.