DCDC modules are not the way to go

Hi,
I have just had my theory that nowadays SMPS's have all been designed and are all available "offtheshelf" disprooven.
I tried..

Vout = 5V
Pout = 5W
Vin = 5 to 36V
No isolation.
Open frame or closed, or SMD or Thru hole, whatever.

Nothing available offtheshelf! Digikey nil DCDC converter section

So this is a custom design....wow!

..or do you know of a vendor?

There's a lot of vendors of small potted modules,
they are all over the pages of rags like EDN, Electronic
Design, etc.

Now the super-wide input range kind of stands out
to me. 7:1 input range is a stretch for many topologies
and wanting 5V in, 5V out means (for any load regulation)
you need a buck/boost or other boost-capable topology.
However a lot of the small modules are simple buck POLs
(anything with a transformer will be bigger as it has to
pass the switching waveform, not just block its HF AC
as part of the output filter, has to have two windings
instead of one, etc.).

A lot of them seem to be direct sellers and not selling
through distribution.

Pico Electronics is one that comes to mind, but you
can find lots of them even in the electronic versions
of power electronics type mags as well as the general
industry trade pubs.

As Dick mentions;
The 5v out requirement for a 5v input.
And to a lesser degree, the very wide input range.

its not everything, but its close
look at XP Power VR10 series or SVR10 series

XP a no go for that input range, power, Vout, etc ....

Buck Boost -



Regards, Dana.

Hi,

If you have to design one, for a conversion factor of 1 and an uninverted output, you need a 4-switch buck-boost type converter so as to be able to have a reasonable duty cycle. Considering that the input is 5V minimum, you could consider the LM5118 PWM controller or the likes which can be powered with as low as 3V.

like this..? - how many would you like ... ?