Test Case 2—Operation With MOSFET of Higher RDS(ON)
and Open-Loop Control
In order to demonstrate the impact of higher RDS(ON), the
MOSFET of the converter has been replaced by IRFZ34 with
RDS(ON) equal to 25.45 mΩ measured at gate voltage and drain
current equal to 12 V and 4 A, respectively. The output voltage
of the converter dropped to 18.68 V for the same input voltage,
duty ratio, and output load resistance, as described in test case 1.
This operation is similar to open-loop control where the duty
cycle is not changed with the variation of the output voltage of
the converter since input voltage is fixed to 15 V.