Switching regulator and control circuit thereof and quick response method

A control circuit for use in a switching regulator, wherein the control circuit is configured to operably convert an input voltage to an output voltage;

• the control circuit comprising:
• a PWM signal generation circuit coupled to at least one power stage circuit, the PWM signal generation circuit being configured to operably generate a PWM signal according to the output voltage and a quick response (QR) signal;
• and
• a QR signal generation circuit coupled to the PWM signal generation circuit, the QR signal generation circuit being configured to operably generate the QR signal according to the output voltage, wherein the QR signal generation circuit includes:
• a differentiator circuit, which is configured to operably perform a differential operation on a voltage sensing signal related to the output voltage, so as to generate a differential signal;
• and
• a comparison circuit coupled to the differentiator circuit, the comparison circuit being configured to operably compare the differential signal with a QR threshold signal, to generate the QR signal, wherein when the differential signal exceeds the QR threshold signal, the PWM signal generation circuit performs a QR procedure.

A quick response (QR) method for use in a switching regulator to improve a transient response of the switching regulator, wherein the switching regulator includes at least one power stage circuit, each of the at least one power stage circuit operating according to a corresponding pulse width modulation (PWM) signal;

• the QR method comprising:
• performing a differential operation on a voltage sensing signal related to an output voltage, so as to generate a differential signal;
• comparing the differential signal with a QR threshold signal, to generate the QR signal, wherein when the differential signal exceeds the QR threshold signal, a QR procedure is performed;
• and
• in the QR procedure, a PWM signal generation circuit of the switching regulator operably adjusts the PWM signal according to the QR signal, such that a power switch of each power stage circuit is ON or OFF for a QR period according to a QR pulse signal related to the QR signal.