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.