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Optoelectronics/Displays??

HBLED driver integrates PWM dithering

Posted: 17 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? EMI control? PWM?

Micrel Inc. is rolling out the MIC3203 step-down high-brightness LED (HBLED) driver controller IC with high-side current sense and pulse-width modulator (PWM) dithering feature for EMI control. The device reduces the complexity and cost of LED driver solutions for high current MR-16 lamps, track/pathway lighting and other architectural lighting applications.

The MIC3203 is capable of driving multiple HBLEDs in series at more than 90% efficiency with 5 percent current accuracy from input voltages of 4.5V to 42V. With its hysteretic control architecture and high-side current sense scheme, the MIC3203 provides an ideal solution to drive the HBLED's with constant current. The MIC3203 operating frequency is adjustable up to 1.5MHz to allow flexibility in the design. The MIC3203 features a dedicated PWM dimming pin, an enable pin for very low power shutdown, over temperature protection and an under voltage lockout. The MIC3203 has an external power switch and requires no external compensation. In addition to enhanced power driving capability and reliability, the MIC3203 is available in an SOIC-8L package.

"With the ever increasing concern regarding carbon emissions and energy costs, high-efficiency lighting has become one of the highest growth segments of the electronics market," noted Doyle Slack, senior marketing director for analog power, Micrel. "Micrel's LED driver products provide the performance, flexibility and ease-of-use required by LED lighting system designers to meet these challenges."

The MIC3203 is currently available in volume quantities, with 1Ku pricing starting at $0.82.





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