This document describes a high power factor, isolated LED driver that does not require opto-isolators and is compatible with TRIAC dimmers. The LT3799 integrates all the required functions for offline LED lighting.
The document presents an application circuit for the LT3799, an integrated controller for offline LED lighting. It highlights how the chip simplifies design by integrating functions typically requiring discrete components like opto-couplers and high-voltage MOSFETs.
Key features discussed include primary-side sensing for output current regulation without opto-isolators, active power factor correction achieving 0.97 or greater, and a unique bleeder circuit that enables TRIAC dimmer compatibility using the transformer primary winding.
No, the IC delivers a well-regulated output current to the secondary side without using an opto-coupler.
Yes, its unique bleeder circuit makes the LED driver compatible with TRIAC dimmers without additional components.
The technique provides power factors of 0.97 or greater.