Question: Modern power FET's can be unreliable in some linear applications due to thermal instability causing die hotspots and premature failure. This is called the Spirito effect. How do Silicon Carbide devices compare?

Answer: 
Take a look at how off-the-line switch mode power supplies work. The very first thing they do is rectify the AC input to DC, using a bridge rectifier. You could literally use such a supply that's rated for 230V AC and connect it to your DC source, bearing in mind that two out of the four diodes in the bridge will be carrying the load. With your modest current / power requirements this should not be an issue.

Using an existing AC-DC switchmode power supply with DC input not only solves your step-down problem, it also isolates your low-voltage side from the dangerously high DC.
Basically just a +1 to hacktastical answer, this is copied from Mean Well FAQ:

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> Q32: In MEAN WELL's catalog, we see AC and DC at input, what is it all about?
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> Ans: Due to different circuit designs, MEAN WELL power supply's input consists of three types as below:
> (VAC≒VDC)
> a.85~264VAC;120~370VDC
> b.176~264VAC;250~370VDC
> c.85~132VAC/176~264VAC by Switch; 250~370VDC
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> In a and b inputs models, power supply can work properly no matter under AC or DC input. Some models need correct connection of input poles, positive pole connects to AC/L; negative pole connects to AC/N. Others may require opposite connection, positive pole to AC/N; negative pole to AC/L. If customers make a wrong connection, the power supply will not be broken. You can just reverse the input poles and power supply will still work.
> In c input models, please make sure that you switch the 115/230V input correctly. If the switch is on the 115V side and the real input is 230V, the power supply will be damaged.
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[source](https://www.meanwell.com/qa.aspx)