Mixed signal digital controller for switched mode power supplies

摘要

A method and apparatus is disclosed for an internal control circuit that switches transistors rapidly on and off to stabilize the output voltage or current of a switch-mode power supply (SMPS). The internal control circuit uses analog and digital signals to regulate the output voltage of the switch-mode power supply. The internal control circuit adjusts the output voltage using pulse width modulation. The duty cycle of the pulse is based upon the comparison of the output voltage and a reference level.