公开(公告)号：US12224115B2

公开(公告)日：2025-02-11

申请号：US18170915

申请日：2023-02-17

Applicant: SEIKO EPSON CORPORATION

Inventor： Kei Ishimaru ,  Yoshihiko Nimura

IPC: H01F7/06 ,  H03F3/45 ,  H03K19/0175

Abstract: A current sense amplifier circuit of a circuit device includes: an operational amplifier; a first resistor provided between one end of a shunt resistor and a first node, a first switch provided between the first node and a first input node, a second resistor provided between another end of the shunt resistor and a second node, a second switch provided between the second node and a second input node, a third resistor provided between a constant voltage node and the third node, a third switch provided between the third node and the first input node, a fourth resistor provided between the constant voltage node and a fourth node, and a fourth switch provided between the fourth node and the second input node.

公开(公告)号：US11799454B2

公开(公告)日：2023-10-24

申请号：US17707069

申请日：2022-03-29

Applicant: Seiko Epson Corporation

Inventor： Takanori Iwawaki ,  Motoaki Nishimura ,  Yoshihiko Nimura ,  Katsumi Inoue

IPC: H03K3/011

CPC classification number: H03K3/011

Abstract: A circuit device includes a control circuit configured to control a transistor current based on a detected temperature. The detected temperature is a temperature detected by a temperature sensor circuit that detects a temperature of a transistor. The transistor charges a load to which a power supply voltage is supplied. The transistor current is a current flowing through the transistor during charging. The control circuit reduces the transistor current when the detected temperature is higher than a first threshold value, and increases the transistor current when the detected temperature is lower than a second threshold value lower than the first threshold value.