公开(公告)号：US12153089B2

公开(公告)日：2024-11-26

申请号：US18165490

申请日：2023-02-07

Applicant: Richtek Technology Corporation

Inventor： Fu-Shiang Lai

IPC: G01R31/317

Abstract: An electronic device is provided, which includes an oscillator, a controller, and a test circuit. The oscillator generates a clock signal according to an enable signal. The oscillator determines a period of the clock signal according to an adjustment signal. The controller generates the enable signal and generates a first test signal according to the clock signal. The controller determines the period according to a first comparison signal and a second comparison signal. The test circuit, through the first test signal, tests the period to generate the first comparison signal and the second comparison signal.

公开(公告)号：US20240186895A1

公开(公告)日：2024-06-06

申请号：US18505165

申请日：2023-11-09

Applicant: Richtek Technology Corporation

Inventor： Fu-Shiang Lai

IPC: H02M3/155 ,  H02M1/088

CPC classification number: H02M3/155 ,  H02M1/088

Abstract: An inductor current emulator circuit is for use in a switching power regulator, wherein a first and a second switches of a power stage circuit switch an inductor. The first and second switches are ON during first and a second ON-times, respectively. The inductor current emulator circuit includes: a sensing circuit sensing an ON-current of the second switch to generate a current sensing signal; and an emulation control circuit configured to, when a duty ratio of the first switch is smaller than a first duty ratio threshold, generate a first part of a current emulation signal according to the current sensing signal during the second ON-time, and sample-and-hold the current sensing signal to generate a first sample-and-hold signal at an intermediate time point of the second ON-time, and generate a second part of the current emulation signal according to the first sample-and-hold signal at a following first ON-time.