Regulator protection circuit and power supply apparatus incorporating it

申请公布号：US7110226(B2)

申请号：US20040845483

申请日期：2004.05.14

申请公布日期：2006.09.19

申请人：

ROHM CO., LTD.

发明人：INOUE KOICHI;KONDO MASAHITO

分类号：H02H5/04;H02H7/00;G05F1/56;H02H1/04;H02H3/20;H02H7/20;H02H9/00;H02M3/00

主分类号：H02H5/04

摘要：A power supply apparatus has a regulator and a regulator protection circuit. On detecting an abnormality, an abnormality detection circuit in the regulator protection circuit turns the regulator off. Based on the output of the abnormality detection circuit, an abnormality detection incidence checking circuit in the regulator protection circuit checks whether or not an abnormality has been detected a predetermined number of times within a predetermined length of time. When the abnormality detection incidence checking circuit recognizes that an abnormality has been detected the predetermined number of times within the predetermined length of time, an abnormality detection level setting circuit in the regulator protection circuit decreases the detection level of the abnormality detection circuit. This helps reduce the incidence of malfunctioning of the load to which the regulator feeds its output due to repeated detection of an abnormality and recovery therefrom.

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