Reporting a real-time characteristic variation of a power converter
may take years of continuous observation in a controlled
ambient condition, and this is not feasible. Therefore, a test case
is considered here. Assuming a rate of increase in RDS(ON) of
2 mΩ/10 000 h, the results are plotted in Fig. 6. There is about
3.75% variation in reliability after 60 000 h of operations or
2238-h variation in MTTF if the variation in MOSFET’s ONstate
resistance is taken into account.