DC to DC converters

Hello,

I am looking for some good application notes regarding
How to use isolated DC to DC converters.

Plus I am also looking for a isolated DC to DC conveters with following
specifications
If they are regulated, then that would be great!

1. Input Voltage range : 5 to 6Volts
Output voltage : 5volts
output current: 5 Amp.

2. Input Voltage range : 18Volts
Output voltage : 18 volts
output current: 3 Amp.

3. Input Voltage range : -18 Volts
Output voltage : -18 volts
output current: 3 Amp.

Thanks very much.
Regards
John

.

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