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Optoelectronics/Displays??

Power IC allows low cost, small size LED driver

Posted: 15 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? single-chip? power supply? high-voltage LEDs?

Exclara Inc. has released the Exclara HVX family that enables low cost, small size LED driver solutions while improving efficiency, power factor and quality. Using Exclara's patented high-voltage driver technology, the HVX family makes high-voltage LED driver economically and physically effective to use in a commercially available product, paving the way for mass-market, 'sub-$10' LED lights.

The EXC100, is a single-chip power supply for high-voltage LEDs. This low-cost driver supports low parts count. Only a handful of supplementary components are needed, thereby reducing driver size and allowing it to fit into the base of a small bulb or on the LED board itself. For example, a 10W power supply only requires 10 to 15 components including the PCB. Integration of all control functionality required for high-voltage AC operation leads to lower cost solutions. This also allows a smaller overall power system and very low bill of materials (BOM) cost.

The HVX family has been designed to deliverand improve uponthe four essential performance requirements for volume LED applications: high efficiency, power factor correction, dimmer support and low EMI with maximum reliability and long life. HVX drivers achieve efficiencies of 90C96 percent, while the typical flyback DC system achieves 75C82 percent. HVX-based systems offer a high power factor because there is no utilization of reactive components, and HVX achieves even higher power factors as the internal controller performs the power factor correction. HVX includes dimming capability and is compatible with most dimmers on the market. As for EMI, while HVX performs internal switching, it is implemented in a way that does not produce large harmonics and meets FCC requirements without the use of external components.

The EXC100 supports operation either directly from AC line or from dimmers, making it a good drop-in choice. An HVX-based driver system does not require use of an electrolytic capacitor and therefore can match the operating life of LEDs. It also supports millions of "on/off" actions without failure, a limitation in the traditional DC based drivers.

The EXC100 also helps maximize end product safety with advanced features such as protection against overtemperature and output overvoltage to guard against a LED failure. It complies with both UL/CE and FCC requirements in the USA and with equivalent counterparts worldwide.

The EXC100 is packaged in QFN-28L and is available in sample quantities, with full production expected in August 2011. The EXC100 is priced at $1.29 in quantities of 250K pieces.

A broad range of reference designs are available for the EXC100, enabling LED system designers to quickly and easily get their products to market. Reference designs include T8, T10 and A19 form factors and support for worldwide input VAC and a range of power output. The design kits include schematics and Gerber files as well as both a driver board design and a light source LED board design. All use standard low-cost parts.





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