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Flyback controller for USB

Other Parts Discussed in Thread: LM3481

Hello,

I have a task to design an isolated .25watt, 24V supply to run off of USB.  My difficulties are two:

1. Identifying a controller that would operate from 5V.

2. Limiting the switch current such that the USB 100ma current limit is not exceeded (i.e. during inrush to the output capacitor)

You're suggestions are welcome.

Mike Fortner