Compact Universal AC input, 300W 12V output

2 posts / 0 new

Hello,
I need to design a very compact 300W power supply...
Universal AC input (90 to 264Vac)
12V output at 25A
No standby outputs
And it needs to be stand-alone, with no aux supply input.
(or if there is an aux supply I need to generate that too from the AC input)

It seems that the HyperPFS and HyperLCS may be a good fit, is that the best option?

I don't have a lot of space though. (It's a long thin supply to fit into a 1U chassis)
So something that is as compact as possible would be great.
At the moment it looks like I may struggle to fit big inductors and the transformer.

Can you suggest a suitable reference design I can look at, or example schemati?.
(I'm not really a power supply designer so I need all the help I can get)

Many thanks,
Fiona

Hi Fiona,

Thank you for your interest in using Power Integrations' part.
You can use below design for your schematic reference and design. You might be limited with thermal capability of the existing design to 300W so use higher part size of LCS. If the existing transformer design can't meet the 300W you need to increase the operating frequency or if it won't fit your 1u requirement, use smaller transformer with higher operating frequency probably 120-180kHz. See below reference design. Unfortunately you need separate auxiliary power supply. Thank you.

https://ac-dc.power.com/sites/default/files/PDFFiles/der385.pdf