We are designing a circuit which should be powered directly from mains (230VAC), and have in the previous design used a normal transformer.

But in the next design we would like to use an AC-DC converter, since this could make our design more flexible with possible input of 120VAC to 230VAC 50/60Hz.

The output of the converter is preferred to be 5VDC but could be higher.

I have found the bp5048-15 from ROHM, which would do the job.


Does anyone have a better or cheaper solution?

EDIT: wall adaptor is not an option, we need to supply the product directly with mains.

  • \$\begingroup\$ And using an off the shelf power adapter INSIDE the case? \$\endgroup\$
    – clabacchio
    Mar 4, 2012 at 10:09
  • \$\begingroup\$ It all needs to be mounted on one pcb. We have limited space. \$\endgroup\$
    – JakobJ
    Mar 4, 2012 at 10:41
  • \$\begingroup\$ Fine, but it's hard to reach the same livel of integration of this \$\endgroup\$
    – clabacchio
    Mar 4, 2012 at 10:47
  • 1
    \$\begingroup\$ Lots of companies make small "power bricks" intended to be embedded into other products. They are usually already safety-certified, which is important if you want to sell this publicly. \$\endgroup\$ Mar 4, 2012 at 14:40

1 Answer 1


A Power Integrations TinySwitch can also be used to make a simple non-isolated rail for low-power applications. I've had success with these parts in the past.


(apologies for the pasted link, SE sites with iOS Safari are painful to use)

  • \$\begingroup\$ Thanks, I will go with one of the integrated power switches. Probably one from ROHM, since they meet our demands better. \$\endgroup\$
    – JakobJ
    Mar 6, 2012 at 8:47

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