LYT3326 Datasheet | Power Integrations

LYT3314-3328 LYTSwitch-3 Family Single-Stage LED Driver IC with bined PFC and Constant Current Output for Outstanding TRIAC Dimming in Isolated and Non-Isolated Topologies Product Highlights bined Single-Stage PFC + Accurate CC Output - Less than ±3% CC regulation over line and load - Power Factor >0.9 - Ensures monotonic VA reduction with TRIAC phase angle - Low THD, 15% typical for dimmable bulbs, as low as 7% in optimized designs Advanced Integrated TRIAC Dimmer Detection - Detects leading-edge and trailing-edge TRIAC dimmers - High-efficiency mode when no dimmer is present - Selectable dimming profile increases design flexibility - Fast turn-on (<500 ms) - Low pop-on and dead-travel - Active bleeder drive for widest dimmer patibility Design Flexibility - Supports buck, buck-boost, tapped buck-boost, boost, isolated and non-isolated flyback - Up to 20 W output Highest Reliability - No electrolytic bulk capacitors or optoisolators for increased lifetime - prehensive protection Features - Input and output overvoltage - Output short-circuit and open-loop protection - Advanced thermal control - Thermal foldback ensures that light continues to be delivered at elevated temperatures - End-stop shutdown provides protection during fault conditions Description The LYTSwitch™-3 family is ideal for single-stage power factor corrected constant current LED bulbs and downlighters. Each device incorporates a high-voltage power MOSFET and discontinuous mode, variable frequency variable on-time controller. The controller also provides cycle-by-cycle current limit, output OVP, line overvoltage, prehensive protection Features , plus advanced thermal management circuitry. All LYTSwitch-3 ICs have a built-in TRIAC detector that discriminates between leading-edge and trailing-edge dimmers. This capability together with load monitoring circuitry regulates bleeder current during each switching cycle. The controller disables the bleeder circuit pletely if no dimmer is...