Switching regulator control circuit and switching regulator

Abstract

Provided is a switching regulator configured to achieve a 100% Duty state and reduce an occurrence of an overshoot. The switching regulator has a configuration in which a clamp circuit configured to dynamically generate a clamp level clamps an output voltage of an error amplifier in accordance with a peak value of a triangular wave signal.

Description

technical field [0001] The present invention relates to a switching regulator that outputs a constant voltage, and more specifically, to a circuit for suppressing an overshoot of an output voltage. Background technique [0002] Switching regulators are used as voltage supply sources for circuits of various electronic devices. The function of the switching regulator is to output a constant voltage to the output terminal regardless of the voltage fluctuation of the input terminal. However, it is desired to output as close as possible to the output terminal in the region where the voltage of the input terminal drops and cannot maintain the set voltage of the output terminal. Set the voltage of the voltage. And even when the voltage of the input terminal recovers from this state and can supply the set voltage value to the output terminal, it is important to make the voltage of the output terminal transition to the set voltage without overshooting. Therefore, conventionally, th...

AI Technical Summary

Problems solved by technology

[0014] However, conventional switching regulators with clamping circuits have the disadvantage that switching operations are always performed even when the voltage at the input terminal is lowered, and it is impossible to generate DC between the input terminal and the output terminal, which is required for a step-down switching regulator. Connection status (hereinafter referred to as 100% Duty status)

Images