Power Electronics
Power Integrations

LED Driver Support Widest Range of TRIAC Dimmers

Power Integrations announced the LYTSwitch-3 family—the latest addition to the company's LYTSwitch line of LED driver ICs. Ideal for bulbs, tubes, and downlights up to 20 watts, LYTSwitch-3 ICs offer excellent dimming performance with both leading-edge and trailing-edge TRIAC dimmers, and support both isolated and non-isolated topologies.

LYTSwitch-3 ICs feature programmable dimming profiles, enabling designers to optimize drivers for dimming range and efficiency. Deep dimming response is also programmable—to extend dimming range or engage the load-shutdown mode to eliminate the possibility of shimmer. When no dimmer is connected or the dimmer is set at full conduction angle, the IC's dimmer management circuitry is turned off, improving efficiency.

Uniquely, the new driver continuously manages power factor, even in dimming mode, which minimizes apparent power draw (VA) as the bulb dims, preventing power quality excursions in large installations. LYTSwitch-3 ICs also include a thermal-foldback feature that automatically dims the light output to compensate for inadequate fixture cooling or high ambient temperatures, preventing damage and increasing lamp lifetime.

Featuring a power factor of greater than 0.9 and THD of less than 10%, LYTSwitch-3 driver ICs meet all international efficiency standards including EN61000-3-2, CEC Title 20, CEC Title 24, and ENERGY STAR. 

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