Patent ID: 9525390
Filing Date: 2016-12-20
CPC Classification: H03F

Claim Text:
1. A switching circuit that generates a switching pulse that is pulse modulated according to an input signal, the switching circuit comprising: a switching output stage that comprises a high-side transistor and a low-side transistor, and that outputs the switching pulse according to a pulse modulated signal; an error amplifier that comprises a phase compensating filter that generates a feedback signal corresponding to the switching pulse, and that generates an error signal corresponding to a difference between the input signal and the feedback signal; and a pulse modulator that comprises an oscillator that generates a carrier signal having a variable frequency, and that pulse-modulates the carrier signal according to the error signal, so as to generate the pulse modulated signal, wherein the phase compensating filter is configured such that the frequency characteristics thereof can be changed according to the frequency of the carrier signal, and wherein the error amplifier further comprises: an operational amplifier that receives a reference voltage at a non-inverting input terminal thereof; and a first resistor having one end connected to an inverting input terminal of the operational amplifier and the other end receiving the input signal, and wherein the phase compensating filter comprises: