Constant current supply circuit capable of being trimmed

Details Constant current supply circuit capable of being trimmed Constant current supply circuit capable of being trimmed

2007-02-08

2010-02-23

Sterrett, Jeffrey L (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

07667449

ABSTRACT:
To provide a constant current circuit which is capable of not only acquiring characteristics of various sorts of electric circuits even before a trimming adjustment is carried out, performing the trimming adjustment based upon the acquired characteristics, performing trimming processes to both the constant current circuit and a load collectively, and performing an adjustment of a constant current with high precision, but also capable of reducing a total number of manufacturing steps so that a production cost can be lowered, as compared with that of a conventional constant current circuit.A constant current circuit of the present invention includes: a current output portion including a first transistor for causing a reference current to flow and a second transistor for causing an output current with respect to a load to flow, the first transistor and the second transistor connected with each other through a current mirror connection; a depletion transistor connected in series with the first transistor, for adjusting the reference current through trimming; a third transistor interposed between the depletion transistor and a ground point, for controlling tuning on/off of a connection between the depletion transistor and the ground point; and a first external terminal for allowing the reference current to flow through the first transistor.

REFERENCES:
patent: 5889430 (1999-03-01), Csanky
patent: 5966005 (1999-10-01), Fujimori
patent: 6351111 (2002-02-01), Laraia
patent: 6819164 (2004-11-01), Chen
patent: 7479821 (2009-01-01), Imura
patent: 6-195141 (1994-07-01), None

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