Combined Single-Stage PFC + Accurate CC Output

• Accurate CC, better than ±3

• Power Factor >0.9

• Low THD, <10 with typical input and output conditions

• >90 efficient in optimized designs

• High switching frequency and DCM allow compact magnetics

Design Flexibility

• Supports buck, buck-boost, tapped-buck, boost, isolated and

non-isolated flyback topologies

• 2 MOSFET voltage options and 3 power levels for optimum device

selection

Highest Reliability

• No electrolytic bulk capacitors or optoisolators for increased lifetime

• Comprehensive protection features

• Input and output overvoltage

• Open-loop protection

• Advanced thermal control

• Thermal foldback allows output light delivery at abnormally high

ambient temperatures

• Hysteretic shutdown provides protection during fault conditions

Description

The LYTSwitch™-5 family is ideal for single-stage power factor

corrected constant current LED applications – bulbs, tubes and

ballasts.

Each device incorporates a high-voltage power MOSFET and discontinuous

mode, variable frequency, variable on-time controller. The

controller also provides fast (cycle-by-cycle) current limit, input and

output OVP, plus advanced thermal management circuitry.

The combination of a low-side switching topology, cooling via electronically

quiet SOURCE pins and frequency jitter ensures extremely low EMI.

This reduces the size of the input filter components – greatly reducing

audible noise.

The part numbers shown in Table 1 describe 3 different power levels and

two MOSFET voltage options to cost-optimize designs, while EcoSmart™

switching technology ensures maximum efficiency for each device size

and load condition.