12W AC-DC Power Supply Reference Design Meets All ErP Regulations

12W AC-DC Power Supply Reference Design Meets All ErP Regulations


A reference design kit (RDK-839) containing a 12W ac-dc power supply for appliances, meters or other industrial applications is now available from Power Integrations. In addition to a functioning supply, it includes a bare board and additional devices that will easily allow a similar supply to be built.

Utilizing PI’s energy-efficient TinySwitch-4 family of offline switcher ICs, the design features less than 30mW no-load consumption and 300mW available output in stand-by (500mW input). It meets all existing and proposed energy efficiency standards including European EcoDesign Directive ErPs.

The RDK-839 reference design kit has an input voltage range of 85- to 265-Vac. The highly integrated design uses a simple EE16 transformer. Flexible board design allows the use of either the compact SO-8C package or the cost-effective DIP-8C package without modifying the board.

Summary of Features

  • EcoSmart™ – meets all existing and proposed energy efficiency standards including ErP.
    • No-load consumption <30mW; more than 300mW available in stand-by with 500mW input
    • 84% average active-mode efficiency – DOE6 and EC CoC (v5)
  • The board can fit P/G or the cost-effective D package
  • BP/M capacitor value selects power MOSFET current limit for greater design flexibility
  • Accurate detection output overvoltage protection (OVP) using primary bias winding sensed shutdown feature
  • Accurate tolerance of I2f parameter (-10%, +12%) reduces system cost
    • Increases MOSFET and magnetics power delivery
    • Reduces overload power, which lowers output diode and capacitor costs
  • Integrated TinySwitch-4 safety / reliability features
    • Accurate (±5%), auto-recovering, hysteretic thermal shutdown function maintains safe PCB temperatures under all conditions
  • Auto-restart protects against output short-circuit and open loop fault conditions
  • P and G package with >3.2 mm creepage on package enables reliable operation in high humidity and high pollution environments
  • Meets EN550022 and CISPR-22 Class B conducted EMI with >12 dBµV margin
  • Meets IEC61000-4-5 Class 3 AC line surge

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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