LED driver ICs come with programmable dimming profiles

March 03, 2016 // By Julien Happich
Power Integrations' LYTSwitch-3 family of LED driver ICs is aimed at bulbs, tubes and downlights up to 20 watts. The 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.

The chips 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. The LED drivers are compatible with the widest range of dimmers and provide a choice of MOSFET breakdown voltages for optimized designs. This means that multiple single-sided, ultra-small designs can be based around one IC, reducing design cycle time and part inventory.

 

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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