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AN708
Vishay Siliconix
Low-Power Universal-Input Power Supply Achieves High Efficiency
Expanding global markets have created a demand for what have become known as universal-input power supplies –– that is, power supplies that allow devices to be plugged into wall outlets anywhere in the world. These power supplies must be able to operate directly from 100-, 110-, and 220-V ac power lines without the use of selector switches or jumpers. A power supply with the ability to operate under such conditions while remaining cost-effective is now becoming a necessity. In the under 30-W power range, meeting the above requirements while maintaining high efficiency has been a challenge. Add to this the need to meet various international safety standards, and the circuit designer has his hands full.
AN708 Datasheet
