A driver for a power converter, method of driving a switch thereof, and a power converter employing the same. The backup unit selectively connectsdisconnects the steering unit and the operating unit. The change process changes at least one of a value of a write start voltage and an increase amount in a write voltage in a second write process. In addition, the STR having the tracking signal processing function in the digital mode as well as the general analog mode is mounted on the antenna system, thereby improving accuracy of satellite tracking.