Power Integrations LYTSwitch-5 Single-Stage LED Driver ICs
Power Integrations LYTSwitch-5 Single-Stage LED Driver ICs combine PFC and constant-current output to provide a flexible design platform for multiple common LED topologies. The ICs support non-isolated topologies such as buck and buck-boost for lamps and bulbs and safety-rated isolated flyback topology for ballast applications. These devices incorporate a high-voltage power MOSFET and discontinuous mode, variable frequency, variable on-time controller. The controller provides fast (cycle-by-cycle) current limit, input and output OVP, plus advanced thermal management circuitry.
The LYTSwitch-5 family offers up to 25W, an extended 90VAC to 308VAC universal input range, and a wide output voltage range (2:1). The ICs deliver >90% efficiency, >0.9 power factor, less than 5% total harmonic distortion, and ±3% current regulation accuracy over line, load, variance, and temperature. The LYTSwitch-5 Single-Stage LED Driver ICs are ideal for solid-state lighting applications operating below 25W.
Designers can choose from low-side or high-side switching to optimize for low EMI or reduced inductor complexity. Using the LYTSwitch-5 LED Driver ICs, designers can develop smaller heatsinks and more compact implementations.
Features
- Combined single-stage PFC + accurate CC output
- Accurate CC, better than ±3%
- Power factor of >0.9
- Low total harmonic distortion (THD) of <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
- High 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
Applications
- Down-lights
- High- and low-bay ballasts
- Bulbs
- Tubes
Block Diagram
Featured Switches
Power Integrations LYTSwitch-0 Off-Line Low Power LED Driver ICs
Integrating 700V power MOSFET, oscillator, simple ON/OFF control scheme, & more into monolithic IC.
Power Integrations LYTSwitch-1 Single-Stage LED Driver ICs
Non-isolated LED driver ICs that reduce complexity in bulbs, tubes, and ballasts up to 22W.
Power Integrations LYTSwitch-2 Primary-Side Regulation Switcher ICs
Simplifies low power CC LED drivers by eliminating the optocoupler and secondary control circuitry.
Power Integrations LYTSwitch-3 Single-Stage LED Driver ICs
Ideal for single-stage power factor corrected constant current LED bulbs and downlighters.
Power Integrations LYTSwitch-6 LED Lighting Drivers
Highly integrated with a compact footprint and up to 94% efficient across the load range.