Dialog improves LED dimmer compatibility

Dialog Semiconductor has improved its LED light dimming intellectual property.

β€œThe first LED driver from this new platform, the iW3688, delivers smooth, flicker and shimmer-free dimming supporting the widest range of phase-cut dimmers. It also eliminates the external bleeder circuit,” said Dialog.Dialog improves LED dimmer compatibility

Instead of a bleeder circuit (see below) Dialog has integrated digital algorithms that modulate primary FET switching to draw extra current during dimming. This ensures the input current β€œcontinuously”, said the firm, stays above triac biasing thresholds during forward conduction, eliminating the need for an external bleeder circuit.

iW3688 is a single-stage driver designed for applications up to 20W, including A-style, BR, candle, GU10 and PAR bulbs, and T8 tubes.

On-board dimmer detection allows the chip to work with leading-edge dimmers (R-type or R-L type), trailing-edge dimmers (R-C type), and smart dimmers. Dimming range is claimed to be 1% to 100%, but this is unlikely to be with all dimmers.

In no-dimmer mode, the chip operates in quasi-resonant mode to increase power efficiency and reduce EMI.

No data sheet has been released, only a product brief, so few numbers and little further information is available.

The firm claims the chip can be used in external lighting ballasts, and in both buck-boost and fly-back topologies, inferring isolated operation is possible.

Reversible over-temperature protection is implemented which detects high internal bulb temperature, servoing down output current until temperature is acceptable. β€œThis results in cooler operation, avoids exceeding the temperature rating of the electrolytic capacitors, and helps ensure a predictable and safer bulb operating life,” said Dialog.

 

For more detail: Dialog improves LED dimmer compatibility


About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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