A driver chip includes a high side input terminal, a pulse generator, a level shift, a current detector, a high side output controller, and a high side output terminal. The high side input terminal receives the high side input signal and the pulse generator transfers the high side input signal into the rise pulse signal and the fall pulse signal. The current detector detects the first current and the second current flowing through the level shift, and the high side output controller generates the high side output signal. The high side output terminal controls the switching of the high side transistor by the high side output signal.