1. Skip to navigation
  2. Skip to content
  3. Skip to sidebar

LT3799 Offline Isolated Flyback LED Controller with Active PFC - Video Product Brief

Jeff Gruetter - Product Marketing Engineer Feb 18th 2011

The LT3799 is an isolated flyback 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 opto-coupler. 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 micropower 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 part’s internal circuitry and gate driver.

LT3799 Offline Isolated Flyback LED Controller with Active PFC - Video Product Brief