Power Electronics / Power Management


Solid-state lighting drivers

18 May 2016 Power Electronics / Power Management

Power Integrations has announced the LYTSwitch-3 family of LED driver ICs. Ideal for bulbs, tubes and downlights up to 20 Watts, they offer excellent dimming performance with both leading-edge and trailing-edge TRIAC dimmers, and support both isolated and non-isolated topologies.

The devices feature programmable dimming profiles, enabling designers to optimise 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 to improve efficiency.

The driver continuously manages power factor, even in dimming mode, which minimises 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.

These new driver ICs can be used to provide buck, boost, buck-boost, tapped-buck, tapped-buck-boost and isolated flyback topologies. They are compatible with a wide range of dimmers and provide a choice of MOSFET breakdown voltages for optimised 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 total harmonic distortion (THD) of less than 10%, LYTSwitch-3 ICs meet all international efficiency standards including EN61000-3-2, CEC Title 20, CEC Title 24 and ENERGY STAR. They also provide 3% constant-current (CC) accuracy over load, line and from device to device.



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