By Power Integrations 51
Power Integrations' LYTSwitch family enables offline LED drivers with high power factor, which easily meet international requirements for THD and harmonics. Tightly-regulated output current, with better than ±5% CC tolerance, enables efficiency of up to 92% in typical applications.
The LYTSwitch family provides excellent turn-on characteristics for leading-edge and trailing-edge TRIAC dimming applications. This results in drivers with a wide dimming range and fast start-up, even when turning-on from a low conduction angle. Additionally, the device offers large dimming ratio and low "pop-on" current.
LYTSwitch ICs are highly integrated, employing a primary-side control technique that eliminates the optoisolator and reduces component count. This allows the use of low-cost, single-sided printed circuit boards. Combining PFC and CC functions into a single-stage also helps reduce cost and increase efficiency. The 132 kHz switching frequency permits the use of small, low-cost magnetics.
LED drivers using the LYTSwitch family do not use primary-side aluminum electrolytic bulk capacitors. This means greatly extended driver lifetime, especially in bulb and other high temperature applications.