Summary:

A circuit diagram of a general-purpose input 12 V, 350 mA constant voltage/constant current flyback power supply designed using the LinkSwitch-II family of LNK605DG (U1) devices. Typical applications include LED drivers or Battery chargers that require constant voltage/constant current (CC/CV) output characteristics.

design feature

  • Accurate primary side constant voltage / constant current controller eliminates secondary side control and optocoupler
  • No need for current sense resistors for maximum efficiency
  • Solutions that use few components and reduce cost and improve reliability
  • Overheat protection – Strict tolerance range (±5%) plus hysteresis recovery ensures PCB temperature is safe under all conditions
  • Automatic restart output short circuit and open loop protection
  • EcoSmart? – Easily meet all current and proposed international energy efficiency standards – China (CECP) / CEC / EPA / European Commission
  • On/Off control for constant efficiency at very light loads
  • No-load power consumption <200 mW at 265 VAC input
  • Ultra-low leakage current: <5 μA at 265 VAC input (no Y capacitor required)
  • Easily meet EN55015 and CISPR-22 Class B EMI standards
  • Green package: halogen-free and RoHS compliant

4.2W isolated LED driver circuit diagram

See the uploading documentation for details (click to download)

High Frequency Inverter

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