TI Korea (CEO Kent Jeon, www.ti.com/ww/kr) May 15, 2012 – TI has announced a new LED controller featuring constant power regulation functionality. The AC/DC LED driver designated as LM3447 includes dimmer sensing, phase decoder, and adjustable hold current circuitry, enabling smooth, flicker-free dimming operation in offline isolated LED lighting applications including A19, E26/27, and PAR30/38 bulbs, while also allowing retrofit bulbs to be used as lighting solutions. (For more detailed information, samples, and evaluation modules, please refer to www.ti.com/lm3447-pr-kr)

Conventional driver products use constant current control to precisely regulate LED forward current. This approach generates consistent light output or intensity from LEDs within the same bin. However, once current flows through the LED, solder point temperature rises, reducing forward voltage and decreasing efficacy. Conversely, using the new LM3447 with constant power regulation capability, the LED forward voltage lowered by temperature is offset by increasing LED current to maintain constant LED power. As a result, efficacy is improved by up to 10% over the device's predicted operating temperature range. (Related video is available at www.ti.com/lm3447v-pr)

LM3447 is added to TI's offline LED lighting controller portfolio, which includes the National LM3445, the industry's first phase-cut dimmable LED driver with constant current control, and TPS92310, a primary-side regulator for applications without dimming functionality (For more detailed information on TI's complete lighting product line, please refer to http://www.ti.com/lighting-pr). The LM3447 was demonstrated at TI's booth (booth number 6935) during Lightfair International held in Las Vegas, Nevada, USA from May 9-11, 2012.

Key Features and Benefits of LM3447 LED Driver
• Integrated phase dimmer decoding and dimmer sensing circuitry support simple design and optimal efficiency
• Operates with leading edge (TRIAC) dimmers and trailing edge dimmers
• Primary-side control functionality supports isolated lighting design without optocouplers
• Constant current LED load regulation compensates for LED junction temperature variations, improving efficacy of LED arrays
• Fixed frequency discontinuous conduction mode flyback topology with valley switching simplifies EMI filter design
• Power factor correction above 0.9 meets all regulatory requirements
• Temperature foldback functionality protects LED arrays from overheating while still providing reduced light output

Availability, Package, and Pricing
LM3447 is currently available in volume through TI and TI authorized distributors. It is provided in a 14-pin TSSOP package, with a unit price of $1.15 at 1,000 unit volume.

More Information on TI's LED Lighting Portfolio
• Order samples and evaluation modules of the new LED driver: www.ti.com/lm3447-pr-kr
• More detailed information on TI's LED drivers: www.ti.com/lighting-pr
• Ask questions and share knowledge at the LED forum in TI E2E™ Community: www.ti.com/ledforum-pr
• Download LED reference designs from TI's PowerLab™ reference design library: www.ti.com/powerlab-pr
• Develop complete LED driving solutions using TI's AC/DC LED driver online navigation tool: http://www.ti.com/ww/en/lighting/bulb/selectortool.shtml