Circuit design of high efficiency 5.3W isolated LED driver

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Summary:

A circuit diagram of a universal input 7.6 V, 700 mA constant voltage / constant current flyback power supply designed using the LinkSwitch-II device LNK606PG, which is suitable for LED driver applications.

The LNK606PG (U1) integrates power switching devices, oscillators, CC/CV control engines, and startup and protection functions into the IC.

design feature

  • Accurate primary side constant voltage/constant current controller (CV/CC) eliminates optocoupler and all secondary side CV/CC control circuits
  • Maximum efficiency without current sense resistors
  • Use less component, low cost solution
  • Auto-restart protection reduces output power to less than 95% with output short-circuit or open-loop conditions
  • Hysteretic thermal shutdown prevents power supply damage
  • Meet CEC and ENERGY STAR 2.0 efficiency requirements:
  • On/Off control provides constant efficiency at very light loads
  • No-load power consumption <250 mW at 265 VAC input
  • Ultra-low leakage current: <5 μA at 265 VAC input (no Y capacitor required)
  • Meets EN55015 and CISPR-22 Class B Conducted EMI Limits
  • Green package: halogen-free and RoHS compliant

Circuit diagram of high efficiency 5.3W isolated LED driver

See the uploading documentation for details (click to download)

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