Macroblock New Constant Current DC/DC Buck Converter Brings High Efficiency for LED Lighting

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By use of constant current mode hysteretic PFM control scheme, Macroblock new high-efficiency DC/DC converter-MBI6650 definitely enhances system stability and efficiency, and become a top choice for LED lighting applications. To provide complete support and service to customers, Macroblock is going to participate at Electronica 2008 Munich, Germany in November and host a series of technical seminars in China in September.


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As a new era of lighting industry is driven by the revolutionary LED technology, many IC experts aim to offer the best solution for various LED applications. In particular, the problem of LED illumination efficiency and lifespan has always been a core concern, and accordingly, Macroblock's newly released 1.2A constant current buck DC-DC converter-MBI6650, is making a great impression in the market. It integrates the hysteretic PFM control technique, which enhances power efficiency up to 93% and well extends the life time of LED.

With built-in protection function, the MBI6650 shows excellent system reliability and security. It also successfully assists customers with LED street lamp design, which makes Macroblock stand out in the market. In order to provide well-though-out service to customers this year, Macroblock is ready to conduct seminars in September in China and present the MBI6650 converter at Electronica 2008 Munich, Germany from November 11 to 14, 2008 (Booth #A5.532).

Macroblock reveals its new discovery on LED technology-Hysteretic Pulse Frequency Modulation (PFM) control scheme, which brings high efficiency power at a wide range of loading conditions. Compared to traditional PWM methods, the power efficiency reaches 60% at light loading. The Hysteretic PFM control scheme not only strengthens system stability, but upgrades the efficiency up to 85% at light loading and 90% at heavy loading.

By combining the features of adaptive output switching frequency and audio frequency skip, both higher current and frequency can be reached as well as avoiding the noise interruption when the MBI6650 is activated. The internal high-side current limit of the control scheme also permits customers to choose a smaller size resistor with lower power consumption, which brings space-saving and increased cost effectiveness.

With only 4 configured extra SMD components, the MBI6650 has an even smaller PCB layout area and brings more cost effectiveness to customers. It also can operate under an input voltage range of 9Vto 30V for high power LED applications. Furthermore, MBI6650's unique thermal protection function with the temperature limit of 140˚C prevents the drivers from overheating. Besides, UVLO, open-circuit and short-circuit protection functions are well-equipped to ensure the safety of the lighting system. MBI6650 is an effective and economic choice for decorative lighting such as the MR16, a high power LED lighting and constant current source.

Facing the huge competition in LED market, Macroblock keeps offering the best solutions with advanced technology in LED illumination. At last, Macroblock welcomes you to visit us at technical seminars in China this September, and at booth #A5.532 at Electronica 2008 in Munich, Germany in November. For more information regarding Macroblock, please refer to

About Macroblock
Macroblock regrades itself as a mixed-signal design house, specializing in the power management and providing solutions for LED applications. Through unceasing efforts over all these years, Macroblock's LED drivers have been successfully applied worldwide on LED outdoor video display panels, LED billboard display, freeway LED message board, road sign and street lights. Macroblock's achievements and credibility are widely recognized worldwide, such as, China, U.S.A, Europe, Russia, Japan and South Korea. Macroblock receives ISO9001:2000 certification in 2004 and ranked 9th in honor on Global LED Driver Supplier Share by IMS Research in 2007.


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