DC-DC Step Down Converter (PCB)

Hi how can i make a PCB Mounted DC-DC step down converter which can reduce the voltage from 90V to 12V. Also, please let me know if i can buy this online

Or please let me know the links to buy the converter online

What is the output current?
Is the output to be isolated? Input Ground connects to output Ground is not isolated.
How many do you need?
Is cost important? size?
Here is something small. (not knowing what you want) Link
It was designed for 110/220 vac but most will work on DC as well. Input voltage range: AC50V-277V DC70V-390V output 12V 300mA.

Hi Thanks for your response. The output rating is fine and thanks a lot. My only question is does it work on DC as well.

satyamech81 said:

does it work on DC as well.

Click to expand...

ronsimpson said:

It was designed for 110/220 vac but most will work on DC as well. Input voltage range: AC50V-277V DC70V-390V output 12V 300mA.

Click to expand...