Overcurrent detecting circuit and semiconductor device

Details Overcurrent detecting circuit and semiconductor device Overcurrent detecting circuit and semiconductor device

2008-03-18

2010-02-09

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S103000

Reexamination Certificate

active

07660091

ABSTRACT:
A highly precise temperature compensation is applied in the detection of overcurrent. A control circuit detects a potential difference produced across a wire owing to the resistance of the wire and a load current that flows into the wire, which connects an NMOS transistor and an output terminal, and controls the NMOS transistor so as to limit the load current if the potential difference exceeds a prescribed value. The control circuit20includes a first diode group having a first end from which a first current is passed in a forward direction by a first current source and a second end connected to a first end of the wire, and a second diode group having a first end from which a second current is passed in a forward direction by a second current source and a second end connected to a second end of the wire. The prescribed value is corrected based upon a potential difference across the first ends of the first and second diode groups so as to reduce a change in output-current limit value produced a change in resistance of the metal wire with temperature.

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