Power Integrations has introduced a range of single-chip mains LED drivers for loads between 2.5 and 50W with +/-5% current regulation.
Called LYTSwitch, the devices can be wired for isolated and non-isolated operation.
"LYTSwitch delivers tight regulation and high efficiency for tube replacements, high-bay lighting and triac-dimmable bulb applications," said the firm.
Seven variants cover 12-50W load range, with 2.5-8W minimum load limitation depending on the device. Maximum operating voltage is 132V, so these are not compatible with European mains power.
![Electronica: 90% Efficient Mains LED Driver From Power Intergrations](http://aka-cdn-ns.adtech.de/images/AT277_2x2.gif)
Combining PFC and current regulator eliminates the need for a high-voltage electrolytic bulk capacitor - with its inherent size and life-time limitations.
![Electronica: 90% Efficient Mains LED Driver From Power Intergrations_1](http://aka-cdn-ns.adtech.de/images/AT277_2x2.gif)
Over-voltage, over-current and over-temperature protection are included.
Both leading-edge and trailing-edge triac dimming is possible "even at low conduction angles, easily complying with NEMA SSL6. Start-up is typically less than 500ms, even when dimmed to less than 10% output", said the firm. "Bulbs using LYTSwitch ICs will turn on at almost the same dimming angle as it was at turn-off, virtually eliminating pop-on. Dead band in triac dimming is also eliminated as the controller ensures that dimming occurs as soon as the dimmer is operated."
Samples in eSIP-7C (E package) and eSIP-7F (L package) are available now, and there are several reference designs.