公开(公告)号：US10008927B2

公开(公告)日：2018-06-26

申请号：US15221629

申请日：2016-07-28

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Hoang Quoc Duong ,  Hyun-Seok Shin ,  Jun-Hyun Bae

IPC: H02M3/155 ,  H02M1/08 ,  H02M1/14 ,  H03F3/45

CPC classification number: H02M3/155 ,  G05F1/575 ,  H02M1/08 ,  H02M1/143 ,  H03F3/45076 ,  H03F2203/45116

Abstract: A regulator circuit includes an operational amplifier, a buffer, a power transistor, a first feedback circuit, a current sensor, and second feedback circuit. The operational amplifier drives a first node with a first voltage generated by amplifying a difference between an input voltage and a feedback voltage. The buffer drives a second node with a second voltage generated by buffering the first voltage. The power transistor has a drain receiving a supply voltage, a gate connected to the second node, and a source connected to a third node. The current sensor generates a first sensing current based on the second voltage. The second feedback circuit generates a plurality of feedback currents corresponding to a ripple of the output voltage and enhances a speed at which the ripple is reduced by providing at least one of the plurality of feedback currents to the third node.