DEVICE FOR CONTROLLING A SWITCHING MODE POWER SUPPLY

摘要

An apparatus for controlling an output voltage of a switching mode power supply (SMPS) by adjusting a switching duty ratio is provided. A comparator outputs a state signal varying depending on a comparison result between an output voltage of the SMPS and a reference voltage. A clock generator generates an internal chip operating frequency and a switching frequency of the SMPS. A digital controller determines on/off of current cells depending on the state signal input from the comparator. A digital pulse width modulator (DPWM) determines a duty ratio of a digital pulse width modulation signal by determining a charging/discharging time of an internal capacitor based on an amount of current of the current cell.

主权项

1. An apparatus for controlling an output voltage of a switching mode power supply (SMPS) by adjusting a switching duty ratio, the apparatus comprising:
a comparator configured to output a state signal varying depending on a comparison result between an output voltage of the SMPS and a reference voltage; a clock generator configured to generate an internal chip operating frequency and a switching frequency of the SMPS; a digital controller configured to determine on/off of current cells depending on the state signal input from the comparator; and a digital pulse width modulator (DPWM) configured to determine a duty ratio of a digital pulse width modulation signal by determining a charging/discharging time of an internal capacitor based on an amount of current of the current cell.