Output circuit

Details Output circuit Output circuit

2005-01-25

2005-01-25

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S083000, C326S031000, C327S534000, C327S156000, C323S271000, C323S282000

Reexamination Certificate

active

06847231

ABSTRACT:
An output circuit includes: a power supply unit; an output MIS transistor connected to the power supply unit; a reference MIS transistor that is connected to the power supply unit and is invariably in ON state; a current supply unit for generating a reference voltage Vref; an output terminal through which a current is supplied to a load circuit; a comparator; a logic circuit; and a control circuit for carrying out the ON/OFF control of the output MIS transistor. Comparison is made between the reference voltage Vref and output terminal voltage Vout by utilizing the ON-state resistances of the output and reference MIS transistors, thus detecting the magnitude of an output current. If the output current exceeds the target value, the output MIS transistor is turned OFF, thereby protecting it from an excessive current.

REFERENCES:
patent: 6064243 (2000-05-01), Matsuda et al.
patent: 6429635 (2002-08-01), Okubo
patent: 6489833 (2002-12-01), Miyazaki et al.
patent: 04-167813 (1992-06-01), None
patent: P2000-252803 (2000-09-01), None
patent: P2000-299626 (2000-10-01), None

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