LED driver using a depletion mode transistor to serve as a...

Details LED driver using a depletion mode transistor to serve as a... LED driver using a depletion mode transistor to serve as a...

2005-06-10

2010-06-01

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S210000, C315S307000

Reexamination Certificate

active

07728529

ABSTRACT:
In a LED driver using a depletion mode transistor to serve as a current source, the depletion mode transistor is self-biased for providing a driving current to drive at least one LED, thereby requesting no additional control circuit to control the depletion mode transistor. The driving current is independent on the supply voltage coupled to the at least one LED, thereby requesting no additional voltage regulator, reducing the circuit size, and lowering the cost.

REFERENCES:
patent: 4403157 (1983-09-01), Guajardo et al.
patent: 5087982 (1992-02-01), Smothers
patent: 5933441 (1999-08-01), Chen
patent: 6348766 (2002-02-01), Ohishi et al.
patent: 6498440 (2002-12-01), Stam et al.
patent: 6762563 (2004-07-01), St-Germain et al.
patent: 7202608 (2007-04-01), Robinson et al.

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