Cost-effective power supply scenario for this project

Thread Starter

Xavier Pacheco Paulino

Joined Oct 21, 2015
727
I'm working on a project that needs two separate voltages: 5V and 12V.
12V for a gate driver and 5V for a microcontroller. Both have to be isolated, they must not share ground.
I do not have the time now to design a switching power supply, so I'm looking for possible PCB mount switching power supplies that I can adapt to my PCB. Their input is 120VAC/60Hz from mains. So, it's a AC/DC type converter.

About the load requirements, the 12V is just for the gate driver to provide the peak currents. So, I think that anything between 1 to 3A would work. The 5V will supply two microcontrollers and other ICs. I expect the load current for the 5V source to be 3.5A max (worst scenario).

I physically have these two switching power supplies:
EPS-65S-12
EPS-65S-5

But I find them kind of big in size for the project. I need something that I can save as much space as possible.
What do you recommend?

EDITED:
What do you think of this one? Kind of "expensive".
 
Last edited:

ebeowulf17

Joined Aug 12, 2014
2,945
Why not use a transformer, bridge, bulk caps and two regulators. Should be
~ $10 to do.

View attachment 155713

Or use a compact PC power supply -

https://www.ebay.com/itm/1x-CPA09-010A-AC-Power-Supply-Brick-Charger-Adapter-Cable-Cord-for-Xbox-360-SLIM/311949413161?hash=item48a1a24b29:g:JQQAAOSwxvBZpmjh and a regulator for 5V.



Regards, Dana.
Those would sound good, except:

Both have to be isolated, they must not share ground.
 
Top