Combined 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 compatibility
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
• Comprehensive 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, comprehensive protection features, plus advanced
thermal management circuitry.