Low-to-medium power single chip digital controlled DC-DC regulator for point-of-load applications

摘要

A DC-DC converter for generating a DC output voltage includes: a digitally controlled pulse width modulator (DPWM) for controlling a switching power stage to supply a varying voltage to an inductor; and a digital voltage feedback circuit for controlling the DPWM in accordance with a feedback voltage corresponding to the DC output voltage, the digital voltage feedback circuit including: a first voltage controlled oscillator for converting the feedback voltage into a first frequency signal and to supply the first frequency signal to a first frequency discriminator; a second voltage controlled oscillator for converting a reference voltage into a second frequency signal and to supply the second frequency signal to a second frequency discriminator; a digital comparator for comparing digital outputs of the first and second frequency discriminators and for outputting a digital feedback signal; and a controller for controlling the DPWM in accordance with the digital feedback signal.

主权项

1. A DC-DC converter configured to generate a DC output voltage, the DC-DC converter comprising:
a digitally controlled pulse width modulator configured to control a switching power stage to supply a varying voltage to an inductor; and a digital voltage feedback circuit configured to control the digitally controlled pulse width modulator in accordance with a feedback voltage corresponding to the DC output voltage, the digital voltage feedback circuit comprising:
a first voltage controlled oscillator configured to convert the feedback voltage into a first frequency signal and to supply the first frequency signal to a first frequency discriminator;a second voltage controlled oscillator configured to convert a reference voltage into a second frequency signal and to supply the second frequency signal to a second frequency discriminator;a digital comparator configured to compare digital outputs of the first and second frequency discriminators and to output a digital feedback signal; anda controller configured to control the digitally controlled pulse width modulator in accordance with the digital feedback signal.