LT3799 Datasheet PDF

●The LT3799EMSE#PBF is an offline isolated flyback LED Controller with power factor correction specifically designed for driving LEDs. The controller operates using critical conduction mode allowing the use of a small transformer. Using a novel current sensing scheme, the controller is able to deliver a well regulated current to the secondary side without using an optocoupler. A strong gate driver is included to drive an external high voltage MOSFET. Utilizing an onboard multiplier, the LT3799 typically achieves power factors of 0.97. The FAULT pin provides notification of open and short LED conditions. The LT3799 uses a micro-power hysteretic start-up to efficiently operate at offline input voltages, with a third winding to provide power to the part. An internal LDO provides a well regulated supply for the parts internal circuitry and gate driver.

● Isolated PFC LED driver with minimum number of external components

● TRIAC dimmable

● VIN and VOUT limited only by external components

● Active power factor correction

● Low harmonic content

● Accurate regulated LED current ±5% typical

● Open LED and shorted LED protection