Hello,

i have a similar question
Im driving steppermotors at 60Vdc (45Vac)
And want to power 1 to 3 12Vdc 0,35A cpu-fans/blowers to cool electronics

But how do i get 12Vdc 1,1Amp from 60Vdc
or is it easier or better to use a second 230vac to 12vdc transformer

hope someone has an answer
thanks in advance

luberth
http://cstep.luberth.com





SM Ling wrote:

> See TL783, from 21.5V to 125VDC input, adjustable output:
> http://www-s.ti.com/sc/ds/tl783.pdf
> or this:
> http://focus.ti.com/docs/search/paramsearch.jhtml?tfsection=param_table&templateId=2&showAssociated=false&familyId=437
>
> Ling SM
> > Can anyone suggest a good way of creating a 5V supply (max 250mA) from a
> 40V
> > supply. Most of the simple regulators don't seem to like this high an
> input
> > voltage.
>
> > Oh and if this is too easy how about generating a +5V supply again
> > 250mA from a -40V supply, needs to be able to share the same ground as the
> > +40v and -40v supply and must be +5V not -5V.
>
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