LED driver and start-up feedback circuit therein

Details LED driver and start-up feedback circuit therein LED driver and start-up feedback circuit therein

2011-07-26

2011-07-26

Le, Don (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Plural load device regulation

C315S224000, C315S2090SC

Reexamination Certificate

active

07986108

ABSTRACT:
An LED driver includes a start-up feedback circuit, an operating feedback circuit and a multiplexer. The start-up feedback circuit has first terminals for receiving LED feedback voltages each delivered from at least one LED coupled to an output terminal for outputting an output voltage, of the LED driver, and generates a start-up feedback voltage accordingly. The operating feedback circuit has second terminals for receiving the LED feedback voltages, and generates an operating feedback voltage accordingly. The multiplexer selects the start-up feedback voltage for initial boost of the output voltage when the LED driver is initially activated, and selects the operating feedback voltage for following boost of the output voltage when the output voltage increases to a certain value.

REFERENCES:
patent: 2009/0026977 (2009-01-01), Omi
patent: 2010/0156315 (2010-06-01), Zhao et al.
patent: 2010/0277072 (2010-11-01), Draper et al.
patent: 2010/0320935 (2010-12-01), Wibben

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