A power converter is described herein. The power converter may be configured to enable a high-side switch when a resonating voltage at a switching net coupled between the high-side switch and a low-side switch reaches a maximum voltage while the power converter operates in a discontinuous current mode. The power converter may sample the resonating voltage at the switching net at a time when the high-side switch is enabled and compare the sampled voltage with a previously-sampled voltage of the switching net. A frequency of an oscillating signal that drives the activation of the high-side switch is periodically adjusted based on the comparison, which causes the high-side switch to be enabled at different times with respect to the resonating voltage. The frequency of the oscillating signal is continuously adjusted such that the high-side switch is enabled at time(s) where the resonating voltage reaches (or is near) its maximum voltage.