Test case 1 has been performed to get a reference for openloop
control and closed-loop control with increased RDS(ON).
The output voltage drops with an increase in RDS(ON) during
test case 2. Since the ambient temperature T in (13) was fixed
to 25 ◦C, decreased voltage stress across the output capacitor
will result in smaller failure rate λCAP0. Moreover, the power
loss in the MOSFET was decreased due to smaller input current
(4.15 A) compared with 4.28 A in test case 1. The case
temperature of the MOSFET was decreased from 44.6 ◦C to
40.4 ◦C. Therefore, these observations agree with the fact that
increased ON-state resistance of the MOSFET in an open-loop
boost converter will increase the reliability of the entire power
converter since the MOSFET and the capacitor are the most
failure-prone components here [2].