Operation from 480 Vac Mains

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Hello: My customer has requested that I provide an AC-DC isolated power supply that can operate over a very wide input voltage range--from 120 Vac all the way to 480 Vac services. The output would be 5V at approx. 1 amp.
Has a design like this been accomplished with Power Integrations devices? If so, can you guide me to information regarding the design. Thank you, Bob D.