Testing integrated COTS DC/DC converters in hostile environment

We have irradiated three integrated COTS DC/DC converters with a 60Co-source at different dose rates, 5, 10 and 22 Gy/h, up to about 4 kGy. They were polarized and loaded during the test, and remotely monitored. After the irradiation, we performed a room-temperature annealing for two weeks, followed by another short-period irradiation. Two of them were also tested in B field up to 1T. Results show that such converters can easily work in a hostile environment under some conditions. We have also designed a DC/DC converter with GaN devices in the final stage, testing it under Gamma-rays and in B field. We discuss here the results. COTS and custom DC/DC converters are now under test in a fast neutron facility. Irradiation with protons and heavy ions will follow in the next months.