Constant-current power-supply circuit formed on an IC

Details Constant-current power-supply circuit formed on an IC Constant-current power-supply circuit formed on an IC

1993-06-16

1995-01-10

Peckman, Kristine L.

Electricity: power supply or regulation systems

Self-regulating

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

327538, G05F 316

Patent

active

053810830

ABSTRACT:
There are provided a first constant-current circuit and a second constant-current circuit, and a first resistor connected in series with the first constant-current circuit generates a band-gap voltage. The first constant-current circuit and the second constant-current circuit constitute a current Miller circuit, and a part of a current that flows through the second resistor connected in series with the second constant-current circuit is outputted as a constant current source. The constant-current power supply IC, which has the above-mentioned arrangement, is designed as follows: the first resistor and the second resistor have a predetermined line-width ratio that is determined in such a manner that if the respective line-widths vary by virtually the same value, a varied amount in the second constant current value that has been caused by a variation in the value of resistivity of the first resistor is cancelled by a varied amount caused by a variation in the value of resistivity of the second resistor. This arrangement is effective in compensating function and makes it possible to minimize the error on the constant current output due to deviations that occur during production.

REFERENCES:
patent: 5008736 (1991-04-01), Davies et al.
patent: 5208527 (1993-05-01), Polotto et al.

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