2.4W/12V output switching power supply circuit diagram

Photocoupler

The figure shows the 2.4W/12V output switching power supply circuit. The circuit is a low cost, small component count, small and lightweight, and can replace the linear power supply solution. The circuit does not require an optocoupler and is extremely energy efficient. It meets the CEC requirements for efficiency in the load mode (57.9%, up to 66%) and low power consumption at no load (less than 300mW at 265V AC input) Meets the EMI limit requirements of ClSPR-22/EN55022B, and the EMI margin is greater than 8dBuV. It converts the AC input voltage from 90 to 265V AC into a single isolated DC voltage output with a power supply output of 12V/200mA (2.4W) and constant IV constant current (CV/CC).