Switching Power Adaptor

90W Switching Power Adaptor Circuit

This is a AC to DC switching power adaptor circuit with maximum output power of 90W. Switching power supply is built using a high voltage power switching regulator IC MC33374 and some other additional components.

The MC33374 IC is a monolithic high voltage power switching regulators that are specially designed to operate directly from a rectified AC line source, and in flyback converter applications.

The MC33374 switching power adaptor combines the required converter functions with a unique programmable state controller. At various variable AC inputs,  it is capable of serving up to 6 A current at 15V output voltage.

This power adaptor is capable of providing an output power in excess of 150W with a fixed AC input of 100V, 115V, or 230V, and in excess of 90 W with a variable AC input that ranges from 85V to 265V. (MC33374 datasheet)

Switching Power Adaptor Circuit

The benefits of Using MC33374

• Simplified interface allows On/Off control by a microcontroller or other circuitry.
• Lower system cost with reduced component count for a total converter system solution.
• Improved reliability with internal thermal shutdown protection, cycle-by-cycle current limiting, and input undervoltage lockout with hysteresis.

For further alternate voltage output design using MC3374 find in datasheet of the switching power adaptor.

Read also: Bench Power Supply Circuit and Lab Power Supply Circuit.