TPS92075

TPS92075 www.ti.com SLUSB88B – DECEMBER 2012 – REVISED JANUARY 2014 Non-Isolated, Phase Dimmable, Buck PFC LED Driver with Digital Reference Control Check for Samples: TPS92075 FEATURES 1 Controlled Reference Derived PFC Integrated Digital Phase-Angle Decoder Digital 50/60 Hz Synchronization Phase-Symmetry Balancing Constant LED current operation Fast Start-up Dimming Implemented Via Analog Reference Control Smooth Dimming Transitions Overvoltage Protection Feedback Short-Circuit Protection Leading and Trailing Edge Dimmer Compatibility Low BOM Cost and Small PCB Footprint Patent Pending Digital Architecture Available in 8-Pin SOIC and 6-Pin TSOT APPLICATIONS Bulb Replacement Area Lighting Dimmable and Non-Dimmable LED Lamps DESCRIPTION The TPS92075 is a hybrid power factor controller (PFC) with a built-in phase dimming decoder. The device analyzes line cycles continuously using an internal, low-power, digital controller for shape and symmetry. The power converter stage generates an analog current reference and uses it to regulate the output current. The device uses control algorithms to manipulate the analog reference. These algorithms optimize dimmer compatibility, power factor and total harmonic distortion (THD). Using a constant off-time control, the solution achieves low component count, high efficiency and inherently provides variation in the switching frequency. This variation creates an emulated spread spectrum effect easing the ...