Wide Range Input Voltage Regulator

I have a situation where I need about 1 amp of 12VDC regulation from a DC voltage that could vary from 18 to 50 VDC.

I have done this before with regular 3-pin 7805 regulators but only if I needed 100ma or so.

Can anyone suggest a method or a device that might fit my bill?

I have been away from this forum for a while, but my arduino projects are alive and well.

Greg

Hi, You could try using an LM2596 Buck Converter Module similar to this. (It is not shipped outside India, but a similar one could be found on Amazon or the local market) Hope this helps!

robu: Hi, You could try using an LM2596 Buck Converter Module similar to this. (It is not shipped outside India, but a similar one could be found on Amazon or the local market) Hope this helps!

Not suitable, the LM2596 is not rated for 50V.

You need a buck converter designed for 18..72V input, though these seem to mainly be the more expensive isolated type like: https://uk.farnell.com/murata-power-solutions/ncs12s4812c/dc-dc-converter-12w-12v-1a/dp/2366473

[ you realize the major electronics distributers all have parametric web search for components like this? ]

Pololu has a 12v buck module that is rated at 2.4 amps with a 12.9v - 50v input: D36V28F12

Dropping 50V 1A to 12V 1A with a linear regulator like the 7812 would need you to disspiate (50-12) * 1A = 38 watts. Thats very wasteful of power and gives you a LOT of hea to get rid of.

A buck regulator is definitely the way to go, plenty of choice out there as in the posts above.

MarkT: Not suitable, the LM2596 is not rated for 50V.

You need a buck converter designed for 18..72V input, though these seem to mainly be the more expensive isolated type like: https://uk.farnell.com/murata-power-solutions/ncs12s4812c/dc-dc-converter-12w-12v-1a/dp/2366473

[ you realize the major electronics distributers all have parametric web search for components like this? ]

I said "similar to LM2596" and not the actual LM2596 module. And you are right.

So many great suggestions. Thanks All!

I am going to try the Pololu brand.

Greg

If you wanted a little more safety margin you might consider this regualtor

gmcmurry: a DC voltage that could vary from 18 to 50 VDC.

What is your power source?

A magneto circuit on a motorcycle, rectifier and a big cap.