TI's new driver ICs are both targeted at AC-powered lighting applications such as retrofit lamps with support for phase-cut triac-based dimmers. The TPS92070 driver IC targets 6W to 20W applications and can also be used in SSL luminaires such as downlights and wall washers. The IC includes power-factor correction (PFC) providing a power factor greater than 0.8 based on a valley-fill circuit. The IC will automatically disable the PFC circuit if it detects a dimmer ensuring optimized dimming response.
The LM3448 utilizes a step-down buck regulator to provide constant output current to LEDs. The IC is specifically designed for space-constrained and cost-sensitive applications such as integral lamps that require minimal external components. The design can handle 2W to 8W applications with full-range dimming and can be combined with external PFC circuits.
Both of the new products include protection features such as thermal shutdown, under-voltage lockout, current limiting, and protection for LED open circuits. Both also integrate the MOSFETs needed to output the pulse-width modulation (PWM) signal that sets the dimming level for LEDs. The products mark the first announcement in the LED lighting space since TI completed the acquisition of National Semiconductor, establishing clear market leadership in LED driver ICs.
Both of the new TI drivers are available now and both come in 16-pin packages. The LM3448 sells for $1.10 and the TPS92070 sells for $0.75 – both in 1000-unit quantities. And both can be used in 110V or 220V lamp designs. www.bgocled.com
Coop grocery stores on the Adriatic Coast in Italy recently installed LED lighting fixtures from Martini Lighting, which are built using Bridgelux Décor LED arrays.
Bridgelux Inc., an LED chip and array provider based in Livermore, California, has developed the Décor line of ultra-high CRI LED arrays in cooperation with Martini Lighting, a division of Martini SpA of Milan, Italy. The arrays are designed to bring ultra-bright solid-state lighting to demanding applications such as retail, hospitality, museum and high-end architectural lighting.
In fact, Coop retail grocers on the Adriatic Coast of Italy recently replaced incumbent lighting with Martini Lighting fixtures and Décor arrays, delivering an 80 percent decrease in energy consumption while reducing the heat and radiation that contribute to food spoilage.
The project involved the one-to-one replacement of 80-110W halogen fixtures with just-introduced 21W Virgola GM and GEX GM fixtures incorporating new Décor ES www.bgocled.com
Cree has announced a new upper level of performance for its XLamp XP-G LEDs, which now deliver up to 140 lm/W in production quantities.
Cree describes its XLamp XP-G LEDs as “the industry’s premier LED optimized for directional lighting, used in a variety of applications from street and area lighting to PAR replacement lamps to high-output flashlights.” Cree also says it is the first LED supplier to publish 10,000 hours of lifetime data, which can allow customers to project TM-21 reported lifetimes greater than 60,000 hours, or nearly seven years.
The cool-white XLamp XP-G provides up to 148 lm and 141 lm/W (for the highest-performing bin), while the outdoor white (4000K) XP-G LED delivers up to 139 lm and 132 lm/W and warm white (3000K) offers up to 122 lm and 116 lm/W, all at 350mA. www.bgocled.com
The LM3448 utilizes a step-down buck regulator to provide constant output current to LEDs. The IC is specifically designed for space-constrained and cost-sensitive applications such as integral lamps that require minimal external components. The design can handle 2W to 8W applications with full-range dimming and can be combined with external PFC circuits.
