VOLTAGE SUPPLY CIRCUITS AND CONTROLLING METHODS THEREFOR

摘要

A voltage supply circuit is provided. The voltage supply circuit may operate at a first or second mode to generate an output voltage at an output node. The voltage supply circuit includes a compensation circuit, a comparator circuit, an inductor, and a driver circuit. The compensation circuit generates a compensation signal according to a feedback signal related to the output voltage. The comparator circuit compares the compensation signal with a first reference signal to generate a comparison signal. The inductor is coupled to the output node. The driver circuit receives the comparison signal and generates a driving voltage to the inductor according to the comparison signal. When the voltage supply circuit enters the second mode from the first mode, a duty of the comparison signal is increased to broaden an operation bandwidth of the voltage supply circuit in a predetermined period at the second mode.