Flyback CV/CC LED Driver IC with Integrated 650 V / 725 V MOSFET and FluxLink Feedback

Figure 1. Typical Application

Data Sheets

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LYTSwitch-6 ECAD Models

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Product Details

The LYTSwitch™-6 series family of ICs dramatically simplifies the development and manufacturing of off-line LED drivers, particularly those in compact enclosures or with high efficiency requirements. The LYTSwitch-6 architecture is revolutionary in that the devices incorporate both primary and secondary controllers, with sense elements and a safety-rated feedback mechanism into a single IC.

Close component proximity and innovative use of the integrated communication link, FluxLink, permit accurate control of a secondaryside synchronous rectification MOSFET with Quasi-Resonant switching of primary integrated high-voltage MOSFET to maintain high efficiency across the entire load range.

Product Highlights

Highly Integrated, Compact Footprint

  • Up to 94% efficiency across full load range
  • Incorporates a multi-mode Quasi-Resonant (QR) / CCM flyback controller, 650 V or 725 V MOSFET, secondary-side control and synchronous rectification driver
  • Integrated FluxLink™, HIPOT-isolated, feedback link
  • Exceptional CV/CC accuracy, independent of transformer design or external components
  • Adjustable accurate output current sense using external sense resistor
  • PWM dimmable

EcoSmart™ – Energy Efficient

  • Less than 15 mW no-load including line sense (without PF front end)
  • Easily meets Energy Star and all global lighting energy efficiency regulations
  • Low heat dissipation

Advanced Protection / Safety Features

  • Input line OV with auto-restart
  • Output fault OVP/UVP with auto-restart
  • Open SR FET gate detection
  • Input voltage monitor with accurate brown-in
  • Thermal foldback ensures that power continues to be delivered (lower level) at elevated temperatures

Full Safety and Regulatory Compliance

  • Reinforced insulation
  • Isolation voltage >4000 VAC
  • 100% production HIPOT compliance testing
  • UL1577 and TUV (EN60950) safety approved

Green Package

  • Halogen free and RoHS compliant Applications
  • Isolated off-line LED driver
  • Smart LED lighting
  • High-voltage flyback post regulator


Power Table

Output Power (Watts)1
Product2227 VAC ± 15%85-305 VAC380 VDC/
450 VDC3
Open FrameOpen FrameOpen Frame
LYT6063C/6073C415 W12 W25 W
LYT6065C/6075C30 W25 W40 W
LYT6067C/6077C50 W45 W60 W
LYT6068C65 W55 W 


  1. Minimum continuous power in a typical non-ventilated and PCB size measured at 40 °C ambient. Max output power is dependent on the design and must ensure that package temperature is < 125 °C
  2. C Package: InSOP-24D
  3. With 725 V FET only
  4. LYTxx6xC - 650 V MOSFET, LYTxx7xC - 725 V MOSFET

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Design Examples

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