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Is the efficiency of a DC DC converter Load independent? (www.meanwell.com)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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I'm currently looking into various DC DC converters and was confused that the Meanwell DDR-60 series only shows a typical rating but says nothing about the efficiency at idle. From AC/DC converters I'm used to have a curve that starts at idle and maybe 70% and goes to 100% load, having the peak at ninetee something.

(Edit: link goes directly to the PDF)

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[–] [email protected] 6 points 1 year ago* (last edited 1 year ago) (2 children)

It’s similar to AC-DC. From a simplistic perspective, efficiency at idle will be 0% because the converter itself still uses some power, then efficiency increases with load since the converter overhead becomes less significant as the useful work increases. Googling “dc dc converter efficiency curve” gives plenty of results.

[–] [email protected] 2 points 1 year ago (1 children)

So I guess I have to contact Meanwell and ask why the linked Datasheet is not showing that curve. Thanks for the answer.

[–] [email protected] 3 points 1 year ago

They might be willing to spec it as "quiescent current" (current drawn at 0 load) even if they don't provide a full curve. Annoying that it's not on the datasheet.