MOS integrated circuit for driving light-emitting diodes

Details MOS integrated circuit for driving light-emitting diodes MOS integrated circuit for driving light-emitting diodes

1989-05-04

1991-10-29

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307241, 307244, 307311, H03K 301, H03K 1756, H03K 342

Patent

active

050618610

ABSTRACT:
An MOS integrated circuit for driving light-emitting diodes (LED's) comprises first constant current circuits, each of which is for one of the LED's and includes a first drive circuit for maintaining the drive current for the associated LED at a predetermined value established by a first reference voltage. The integrated circuit further includes a second constant current circuit which is connected to all of the first constant current circuits to form a mirror circuit with each of said first constant current circuits. A current detecting element detects a predetermined magnitude of current flowing therethrough and develops a current-representative detection voltage. A second drive circuit within the second constant current circuit responds to the detection voltage and a second reference voltage by maintaining said first reference voltage at a predetermined value so that the LED drive current is determined by the said detection voltage and second reference voltage.

REFERENCES:
patent: 3370182 (1968-02-01), Blank
patent: 3569741 (1971-03-01), Bolick, Jr.
patent: 4206368 (1980-06-01), Lenderking
patent: 4718063 (1988-01-01), Reedy et al.
Herzog, "An Electronic Selector Switch Employing Transistors", RCA Technical Notes Published by The Radio Corporation of America RCA Laboratories, Princeton, N.J., Apr. 1958, pp. 1-3.

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