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.