Dialog sampling flicker-free LED driver controllers

Dialog is sampling two new driver controllers for flicker-free high power commercial LED lighting applications up to 90W. They move into volume production in Q2.

In these applications flicker-free operation is essential to avoid eye stress, particularly where there is long-term exposure to the light source. Dialog’s patented Flickerless technology virtually eliminates flicker through digital control that achieves near-zero line frequency ripple.

The iW3629 (non-dimmable) and iW3631 (dimmable) digital power controllers simplify the design of LED power supplies by replacing up to 45 discrete components. Both devices can be used with small input and output bulk capacitors, and small transformers. This cuts power supply size, bill of materials and costs while optimising performance. The controllers feature better than 0.95 power factor (PF), less than 15% total harmonic distortion (THD) and 85%+ efficiency over a wide load range, easily meeting the requirements of the Design Lights Consortium (DLC)1.

The controllers comprise a two-stage design with a rectified AC-input (90 to 277 VAC), active start-up, and a Boost circuit feeding a Flyback converter. The latter provides a constant current drive to the LEDs. Quasi-resonant control in both stages maximizes power efficiency. Dialog’s PrimAccurate primary side sensing technology produces tight line and load regulation while eliminating the need for secondary side feedback components. Fast, smooth start-up takes less than half a second and PF settling time is minimal.

The iW3631 dimmable controller has a shimmer and flicker-free dimming range of 1% to 100%. It has a built-in interface to industry-standard, 0-10V analog dimmers, so there’s no need for an external driving source or microcontroller, and a dimming interface to support wireless solid state lighting applications.


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