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Power Supply: AC/DC, Isolated, no PFC, < 90W

Power Supply: AC/DC, Isolated, no PFC, < 90W

Block Diagram

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MOSFET Driver 1 Secondary Regulator/Driver/Feedback Generator Primary PWM Controller

Design Considerations

AC/DC Isolated Power Supply without PFC < 90W

An AC/DC Isolated Power Supply without PFC < 90W is used to convert the AC power lines to an isolated regulated DC output for powering notebook computers and other equipment. Typically, these operate with a wide-range of AC inputs from 85V to 265V AC (for worldwide source voltage compatibility). Generally, there is only one output in the 12V to 20V range which is compatible with most battery packs.

Typically, below approximately 90W, Power Factor Correction (PFC) is not used.

One of the most desirable attributes of an AC/DC supply is high efficiency. To realize this, Zero Voltage Switching is incorporated. Specifically, this Active Clamp and Reset technique features the benefits of Zero Voltage Switching, simplicity and few components.

 

Application Notes

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