Buck-boost converter and related feedback circuit with extended ramp control

Abstract

A feedback circuit for a buck-boost converter having an input voltage and an output voltage includes an error amplifier, a ramp generator, a first comparator and a digital control circuit. The error amplifier is configured to generate an error voltage according to the output voltage. The ramp generator is configured to generate a ramp voltage. The first comparator, coupled to the error amplifier and the ramp generator, is configured to compare the error voltage with the ramp voltage to generate a control signal. The digital control circuit, coupled to the first comparator, is configured to generate a plurality of switching signals according to the control signal and a reference duty signal.

Dependencies are inferred from the claim text.