Research of the total dose irradiation effects of DC/DC power converter used in satellite

In this paper, the total-dose irradiation damage effects and annealing effects of DVHF2812DF and DVTR2815 DC-DC power converters were investigated. The typical electrical parameters, such as input current, output current, output voltage, and input current of inhibition mode, as functions of the total dose with different load (unloaded, 1/4 power loaded, 1/2 power loaded, and full power loaded) and different input voltage (minimum input voltage, typical input voltage, and maximal input voltage) were discussed. We also observed the relationships between these parameters and the annealing time. The experiment results show that when annealing at room temperature, the trapped holes in deeper energy levels annealed little, which results in dramatic changes of the electric parameters of the DVHF2812DF device when irradiated with extra dose irradiation. However, these parameters went back to the initial values when annealing at high temperature. The input current under inhibition mode can be considered as a sensitive parameter in the evaluation of the radiation-hardened levels of the devices. There were more changes of the electric parameters under the full power loaded situation than other conditions. (authors)