Customer is looking for power supply solution that can take either 24V AC or 24V DC input, and have 12V, 3.3V, and 05V DC out all at 100mA range. Do you have any recommendation on what solution can do the trick to take either AC or DC input? Thanks.
You can use a bridge diode that rectifies the ac to dc on the input of a TPS54060 which is a step down regulator.
http://focus.ti.com/docs/prod/folders/print/tps54060.html