It is shown in Section IV that increased RDS(ON) results
in higher duty ratio d and, consequently, higher power loss in
the MOSFET in closed-loop operation of the converter. Similar
results have been observed in test case 3 as the duty ratio
increased from 23.4% (test case 1) to 24.7% to maintain the
output voltage fixed to 19.02 V. An increased duty ratio has
resulted in higher power loss across the MOSFET (case temperature
increased from 44.6 ◦C to 45.3 ◦C). Moreover, there is
no change in the failure rate of the output capacitor since the
voltage stress and the ambient temperature were same in both
test cases 1 and 3. Therefore, it can be concluded that increased
RDS(ON) of the MOSFET in a closed-loop boost converter will
not increase the reliability of the entire power converter.