400VAC input 24VDC output

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Hi, What is the best PI device for a power supply taking 400VAC input and giving a 24VDC output ? Thanks, George
Can you provide more information, such as output current? Power level is an important factor to consider for device selection. To take 400Vac input voltage, you can use a 600V MOSFET and one PI device arranged in the StackFET configuration (cascode). Regards, PI-Scotty
power requirement is less than 5W, Thanks
why to cascade simply?