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Single-Stage LED Driver IC with Combined PFC and Constant Current Output in Isolated and Non-Isolated Topologies


Product Details


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.

Product Highlights

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


Power - Output (Max, Univ) 16.00 W
Breakdown Voltage 650 V
Voltage - Input (Min) 90 V
Voltage - Input (Max) 308 V
Auto-Restart & Overvoltage Response Latch Off
IC Package SO-16B
Internal Switch Yes
Mounting Type Surface Mount
Over-Temperature Response Hysteretic
Power Factor High
Temperature - Operating (Min) -40 °C
Temperature - Operating (Max) 150 °C
Control Features
Frequency Jittering
Auto-Restart/Latching Fault Response
Dimming Interface
0-10 V
Protection Features
Input Overvoltage
Output Open Loop
Output Overvoltage
Output Undervoltage
Thermal Foldback
Output Profile CC
Boost PFC
Product Sub-Type PMIC