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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.