Open loop LED driver system

Details Open loop LED driver system Open loop LED driver system

2005-05-03

2005-05-03

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

By periodic switching

C327S530000

Reexamination Certificate

active

06888383

ABSTRACT:
A switching regulator circuit is arranged to provide a constant current to a load. The switching regulator circuit is operated in discontinuous current mode such that an inductor stores energy in a first part of an oscillation cycle, and discharges in a second part of the cycle. The trigger mechanism for the oscillator is disabled when the charged inductor couples energy to the load, and enabled after the inductor is detected as discharged. The energy stored in the inductor is proportional to the square of the on-time associated with switching regulator. Constant voltage load devices such as LEDs for a display can be driven by the switching regulator in an open-loop mode such that the current in the load devices is a linear function of the on-time.

REFERENCES:
patent: 4618812 (1986-10-01), Kawakami
patent: 5736881 (1998-04-01), Ortiz
patent: 6697402 (2004-02-01), Crawford
patent: 6753723 (2004-06-01), Zhang
“LM2623 Ratio Adaptive, Gated Oscillator Cookbook,”National Semiconductor Corporation, Apr. 2002 (5 pages).
“LM2623 Ratio Adaptive Gated Oscillator Based, DC DC Boost Converter-Low Vin, Low Ripple, General Purpose,”National Semiconductor Corporation, Nov. 2002 (11 pages).

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