公开(公告)号：US20230198473A1

公开(公告)日：2023-06-22

申请号：US18056329

申请日：2022-11-17

Applicant: Richtek Technology Corporation

Inventor： Chun-Jen Yu ,  Ssu-Wei Huang ,  Hsuan-Kai Wang ,  Chi-Jen Yang ,  Hsien-Chih She

IPC: H03F1/14 ,  H03F1/42

CPC classification number: H03F1/14 ,  H03F1/42 ,  H03F2200/222

Abstract: An amplifier circuit having low parasitic pole effect includes a preamplifier, an output transistor and a buffer circuit. The buffer circuit generates a driving signal to control the output transistor according to a preamplification signal generated by the preamplifier. The buffer circuit includes: a buffer input transistor generating the driving signal, wherein an input impedance at its control end is less than that of the output transistor; a low output impedance circuit having an output impedance which is less than an inverting output impedance of the buffer input transistor; an amplification transistor generating an amplification signal at its inverting output; and an amplification stage circuit amplifying the amplification signal by an amplification ratio, so that an equivalent output impedance at a non-inverting output of the buffer input transistor is less than or equal to a product of the reciprocal of an intrinsic output impedance thereof and an amplification ratio.

公开(公告)号：US20240305186A1

公开(公告)日：2024-09-12

申请号：US18488000

申请日：2023-10-16

Applicant: Richtek Technology Corporation

Inventor： Chun-Jen Yu ,  Chi-Jen Yang

IPC: H02M1/088 ,  H02M1/00 ,  H02M3/158

CPC classification number: H02M1/088 ,  H02M1/0009 ,  H02M1/0025 ,  H02M3/158

Abstract: A switching converter includes: a power stage circuit which includes at least one switch to switch an inductor to convert an input power to an output power; a first loop control circuit configured to switch the at least one switch by a peak current mode according to a first feedback signal related to the output power and an inductor current of the inductor in a first control mode; and a second loop control circuit configured to control the at least one switch to switch with a switching period according to a second feedback signal in a second control mode. If the power stage circuit operates in DCM during consecutively more than a predetermined number of the switching periods, the switching converter enters the first control mode. A portion of sub-circuits of the second loop control circuit are turned off to reduce power consumption in the first control mode.

公开(公告)号：US12111339B2

公开(公告)日：2024-10-08

申请号：US18050928

申请日：2022-10-28

Applicant: Richtek Technology Corporation

Inventor： Chun-Jen Yu ,  Hsuan-Kai Wang ,  Chi-Jen Yang ,  Hsien-Chih She

IPC: G01R19/165 ,  G01R31/317

CPC classification number: G01R19/1659 ,  G01R31/317

Abstract: A state detection circuit for detecting whether a state of an input node is floating, grounded, or electrically connected to an external voltage includes: a unidirectional device circuit and a determination circuit. The unidirectional device circuit electrically conducts a test node to a detection node unidirectionally. The detection node is coupled to the input node. The test node, the unidirectional device circuit, the detection node and the input node form a current path. The determination circuit determines a state of the input node according to a voltage level of the detection node. Within a detection stage, the state detection circuit provides a test voltage at the test node. A voltage of the detection node is determined by the input node, the test voltage, and a characteristic of the unidirectional device circuit.

公开(公告)号：US20230160935A1

公开(公告)日：2023-05-25

申请号：US18050928

申请日：2022-10-28

Applicant: Richtek Technology Corporation

Inventor： Chun-Jen Yu ,  Hsuan-Kai Wang ,  Chi-Jen Yang ,  Hsien-Chih She

IPC: G01R19/165 ,  G01R31/317

CPC classification number: G01R19/1659 ,  G01R31/317

Abstract: A state detection circuit for detecting whether a state of an input node is floating, grounded, or electrically connected to an external voltage includes: a unidirectional device circuit and a determination circuit. The unidirectional device circuit electrically conducts a test node to a detection node unidirectionally. The detection node is coupled to the input node. The test node, the unidirectional device circuit, the detection node and the input node form a current path. The determination circuit determines a state of the input node according to a voltage level of the detection node. Within a detection stage, the state detection circuit provides a test voltage at the test node. A voltage of the detection node is determined by the input node, the test voltage, and a characteristic of the unidirectional device circuit.