product news ♦ compound semiconductor ♦ news digest
for some time and in the lighting market, they have been implemented in entertainment solutions. Now, there is particular interest from the makers of retrofit bulbs designed to replace traditional incandescent lamps and replicate the color change from white to reddish-yellow as the light is dimmed.
Unlike conventional bulbs, white LEDs do not change color as they are dimmed so the “color” of the white light is always the same. Adding an amber LED to the system allows a retrofit bulb’s light to change in a way that people already expect. However, amber LEDs typically have poor light output and color stability at the high temperatures found in retrofit bulbs. LUXEON Rebel PC Amber combines the same blue, thin film flip chip used in the company’s white LUXEON LEDs. By adding proprietary Lumiramic phosphor technology, Philips Lumileds manufactures a highly stable, reliable amber LED that performs in high application temperatures, high humidity, and high drive currents, and still delivers the light output, efficacy, and quality of light required.
“The InGaN based LUXEON Rebel PC Amber with Lumiramic phosphor simplifies system design,” said Frank Harder, VP of Product Marketing for Philips Lumileds. “It gives 4-5 times the light output of AlInGaP amber products so fewer pieces can be used, and it is much more reliable and cost effective from a lumens/watt and lumens/dollar perspective.”
Philips Lumileds continues to improve and expand its LUXEON Rebel LED portfolio so that lighting applications can more easily deliver the quality of light, efficiency, and reliability that customers are expecting from solid-state lighting solutions.
LUXEON Rebel PC Amber LEDs are immediately available from Future Lighting Solutions.
Avago Unveils Compact Fiber Optic Transmitter/ Receiver
The technology allows galvanic isolation on one PCB where previously separate transmitter/receiver pairs on two PCBs were linked by plastic optical fiber for isolation.
Avago Technologies is marketing the 10 MBd HFBR-3810Z Fiber Optic (FO) short link transmitter/ receiver for isolating frequency inverter and power
converter applications common in renewable energy installations.
In power generating wind and solar farms, fiber optics technology is widely considered the preferred isolation technology to interface between low voltage control logic or microprocessors and high voltage power inverters and switching circuits.
The FO short link technology pin-to-pin distance of 24.96 mm provides transient voltage suppression of 12 kV according IEC 60664-1. Avago’s FO short link technology allows galvanic isolation on one PCB where previously separate transmitter/receiver pairs on two PCBs were linked by plastic optical fiber for isolation. The HFBR-3810Z allows much more compact designs.
FO short link devices have creepage and clearance specifications greater than existing optocoupler devices and offer superior galvanic isolation than transformer-based technology.
Fiber technology has excellent EMI resistance and EMC characteristics. The Avago HFBR-3810Z short link transmitter/receiver operates reliably in high noise environments common in high voltage switching and motor control equipment and systems. The DC coupled data link does not require data encoding or digitizing circuitry. The FO receiver has a CMOS/TTL output for easy interface design.
HFBR-3810Z key features include * Proven 650 nm fiber optics technology
* Transient voltage suppression of up to 12 kV according IEC 60664-1
o 24.96 mm pin-to-pin distance * High speed: DC to 10MBaud
* DC coupled receiver with CMOS/TTL output for easy designs
o No data encoding or digitizing circuitry required * Compact assembly: 13 mm x 33.56 mm footprint
o 4.36 cm2 PCB footprint o Single PCB isolation
August/September 2010
www.compoundsemiconductor.net 169
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