During the operation of a DC-to-DC converter in a vehicle, Volt-sec. is inherently embedded in a duty ratio and sourced to change inductor flux linkage, generating the output voltage trajectory compatible with the automotive e-drive command trajectory. With a flux linkage focus, the improved generalized Steinmetz equation (iGSE), i.e. the existing method for estimating core loss for nonsinusoidal waveforms, can be used with the loss model for the transient state of the output capacitor, such that the flux linkage and output voltage command trajectories providing minimum loss can be determined. Finite-settling-step (FSS) control for converters can quickly track flux linkage commands in two switching periods to provide fast command tracking on the output voltage commands, so it has the opportunity for active loss minimization. This paper implements the converter loss model into FSS control, to realize active loss minimization by manipulating flux linkage without compromising fast output voltage command tracking.