A GaN switched-capacitor PWM generator for a current-mode control of switching power converters

This paper presents a solution for the PWM generator of a current-mode control feedback for switching power converters. The circuit was designed in a $0.5-\mu \mathrm{m} \mathrm{GaN}$ technology and is suitable for fully integrated high-performance power converters. The switched-capacitor technique was extensively used to overcome GaN technology limitations and provide a robust implementation against process tolerances and temperature variations. System simulations of the current-mode control used in a flyback dc-dc converter are provided, which show the effectiveness of the proposed solution. The circuit exhibits an overall current consumption as low as 2 mA while operating with a 6-V power supply.