US 11,909,315 B2
Switching regulator and controller circuit and control method thereof
Yung-Chun Chuang, Taipei (TW); and Huan-Chien Yang, New Taipei (TW)
Assigned to RICHTEK TECHNOLOGY CORPORATION, Zhubei (TW)
Filed by Richtek Technology Corporation, Zhubei (TW)
Filed on Jan. 2, 2022, as Appl. No. 17/567,129.
Claims priority of provisional application 63/137,766, filed on Jan. 15, 2021.
Claims priority of application No. 110122066 (TW), filed on Jun. 17, 2021.
Prior Publication US 2022/0231604 A1, Jul. 21, 2022
Int. Cl. H02M 3/158 (2006.01); H02M 3/156 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/0025 (2021.05); H02M 3/156 (2013.01); H02M 3/1566 (2021.05)] 31 Claims
OG exemplary drawing
 
1. A switching regulator, comprising:
a power stage circuit, which includes an inductor and at least one power switch; wherein the at least one power switch is coupled to the inductor, and is configured to operate according to a switch control signal, to control a conduction status of the inductor, so as to convert an input voltage to an output voltage; and
a controller circuit, which is coupled to the power stage circuit, and is configured to operably generate the switch control signal according to a feedback signal and a reference signal, wherein the feedback signal is related to the output voltage and the reference signal is related to a dynamic change of a target level of the output voltage, wherein the controller circuit includes:
a first amplification circuit, which is configured to operably generate an amplification signal according to a difference between a low-pass filtered signal and the feedback signal, wherein the low-pass filtered signal is related to a signal generated by low-pass filtering the reference signal based on a first predetermined bandwidth;
a second amplification circuit, which is configured to operably generate an adjustment signal according to a difference between the feedback signal and a fast response signal;
a ramp signal generation circuit, which is configured to operably generate a ramp signal according to a clock signal; and
a comparator, which is configured to operably compare the amplification signal and the ramp signal, to generate a pulse width modulation (PWM) signal, wherein the controller circuit generates the switch control signal according to the PWM signal;
wherein the adjustment signal is configured to operably adaptively adjust the amplification signal or the ramp signal, so as to reduce a response time or to mitigate or avoid an overshoot or an undershoot of the output voltage;
wherein a voltage level of the fast response signal is between a voltage level of the low-pass filtered signal and a voltage level of the reference signal.