LED buck regulator control IC

Details LED buck regulator control IC LED buck regulator control IC

2007-11-27

2007-11-27

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S307000, C323S282000, C323S285000

Reexamination Certificate

active

11100033

ABSTRACT:
A high speed buck control IC for constant LED current regulation. A continuous mode hysteretically controlled buck regulator monitors the load current using an accurate on-chip band-gap voltage reference. This style of current regulation allows the designer to dispense with large and sometimes bulky output capacitors. The IC is inherently protected against short circuit conditions, and an additional circuit provides open circuit protection. An external high side bootstrap circuit aids in driving the buck switching element especially at high frequencies. A low side driver is also provided for use, e.g. in synchronous rectifier designs. All functions are realized within a small 8 pin DIP or SOIC package.

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Notice of Reasons for Rejection issued Jul. 17, 2007 in the corresponding Japanese Application No. 2005-111169 with English language translation.

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