A Buck Converter With Float Gate Width And Float Gate Voltage Driver

A float gate width and float gate voltage driver is proposed in this paper, which is applied in double N-type power MOSFETs buck converter with large load driving capacity to improve the efficiency. The relationships between the total power dissipation with the gate width and gate voltage are analyzed firstly. Then, a three segment float gate width controller is designed based on peak current mode which can increase the efficiency of the converter at light load status. Moreover, a float gate voltage controller is used when the converter operates with only one segment gate width. Simulation results show that the converter can obtain 10% efficiency improvement under the load current of 150mA.