Title: Overcurrent detecting circuit and reference voltage generating circuit
Application Number: 200610139280 Application Date: 2006.09.20
Publication Number: 1936758 Publication Date: 2007.03.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G05F3/08
Applicant(s) Name: Fuji Elec Device Tech Co., Ltd. Address:
Inventor(s) Name:
Attorney & Agent: longchun
Abstract:
    The invention relates to an overcurrent detecting circuit which may includes a reference load (M1 as MOSFET) through which a reference current flows, generating a reference voltage corresonding to the reference current. A differential amplifier section (M11, M12, M13, M14) is included to amplify the difference in the potentials of two inputs. A bias current supplied by a constant current source (Ib) flows through the differential amplifier section. At least part of a bias current flows to the reference load. A detection voltage, corresponding to a current subject to overcurrent detection, is inputted to one of the two inputs of the differential amplifier section while the drain electrode of M10 entries to one of the two inputs potentials of the differential amplifier section. Thus, the invention can reduce the total current consumed by an electronic circuit.
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