The LYTSwitch family is a group of off-line LED drivers that deliver constant current output to drive LED loads.
The LYTSwitch-0 family is specifically designed for non-isolated non-dimming LED bulb and T8 tube applications. LYTSwitch-0 devices integrate a 700 V power MOSFET, oscillator, simple ON/OFF control scheme, a high-voltage switched current source, cycle-by-cycle current limit and thermal shutdown circuitry into a monolithic IC.
Start-up and operating power is derived directly from the voltage on the DRAIN pin, eliminating the need for a bias supply and associated circuitry.
The family delivers high efficiency (typically > 90%) and tight CC performance and enables very compact cost effective designs.
The LYTSwitch-4 family enables off-line LED drivers with high power factor which easily meet international requirements for THD and harmonics. Output current is tightly regulated with better than ±5% CC tolerance1. Efficiency of up to 92% is easily achieved in typical applications.
The LYTSwitch-4 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. Large dimming ratio and low "pop-on" current.