Title:
発光ダイオード用電流源装置および電源供給方法
Document Type and Number:
Japanese Patent JP2004524704
Kind Code:
A
Abstract:
Current source methods and apparatus for light emitting diodes providing constant diode current and illumination in the presence of voltage and process variations. The method comprises providing a predetermined current through a first transistor, and mirroring the current through the first transistor to at least one additional transistor while holding the voltage across the first transistor to a predetermined value, wherein each additional transistor is coupled in series with a light emitting diode. An exemplary circuit, as well as various illustrative applications are disclosed.
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Inventors:
Bork, Karl Richard
Mulizek, Andrew Jay
Hearts, gary
Mulizek, Andrew Jay
Hearts, gary
Application Number:
JP2002578586A
Publication Date:
August 12, 2004
Filing Date:
March 19, 2002
Export Citation:
Assignee:
Maxim Integrated Products Incorporated
International Classes:
H01L33/00; H05B44/00; G05F1/577; G05F3/26; (IPC1-7): H01L33/00
Attorney, Agent or Firm:
Masaki Yamakawa