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Optoelectronics/Displays??

Catalyst gets patent on switching scheme for green LEDs

Posted: 26 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Catalyst patent? LEDs? switching regulator architecture?

Catalyst Semiconductor Inc. has received a patent for a unique step-down switching regulator circuit architecture applicable to step-down regulators for driving high brightness LEDs. The patent, titled "LED current bias control using step-down regulator" (patent number 7,323,828), was developed to simplify the design of high brightness LED lighting in emerging household, commercial and automotive lighting applications.

The patent is embedded in the company's new line of inductor-based, step-down LED drivers. The new patent enables a simpler, smaller, more cost-effective and far more power-efficient "green" LED driver alternative to linear regulators, says Catalyst.

"When using this new step-down switching scheme, the designer simply selects a control resistor and the patented switching regulation scheme provides an inherently stable and accurate LED bias across a wide range of voltage operating environments without the complicated equations or calculations associated with alternative LED switching regulators," stated Anthony Russell, Catalyst's power management director and co-inventor of the patent.

The first product to incorporate Catalyst's step-down switching regulator architecture is its CAT4201, a high-efficiency 7W buck LED driver optimized for driving high-brightness, 350mA LEDs at up to 94 percent efficiency.




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