The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 2024
Filed:
Jul. 15, 2022
Rohm Co., Ltd., Kyoto, JP;
Akihiro Kawano, Kyoto, JP;
ROMM Co., LTD., Tokyo, JP;
Abstract
Provided is a control circuit of a step-down converter, the control circuit including a bottom detecting circuit that asserts a turn-on signal when an output voltage of the step-down converter falls below a bottom level, an on-time generating circuit that includes a second timer circuit capable of measuring an on-time Tin such a manner that the assertion of the turn-on signal is a trigger for the measurement, and is configured to obtain a relation of T=α·V/Vwhen an input voltage of the step-down converter is defined as V, the output voltage is defined as V, and a controllable coefficient is defined as α, a control logic that sets a high-side transistor to an on-state during the on-time Tfrom the assertion of the turn-on signal and subsequently sets a low-side transistor to an on-state until the turn-on signal is asserted next, and an on-time correcting circuit that decreases the coefficient α when a switching period of the control logic is longer than a reference period, and increases the coefficient α when the switching period of the control logic is shorter than the reference period.