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Design ideas for a low-count part, low power isolated DC-DC power supply?
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Marco:
Why do they all use these ridiculous poor regulation, minimum load architectures instead of something nice with pulse skipping and feedback?
T3sl4co1l:

--- Quote from: Marco on November 08, 2018, 07:18:35 am ---Why do they all use these ridiculous poor regulation, minimum load architectures instead of something nice with pulse skipping and feedback?

--- End quote ---

They do.

The ones that do, cost twice as much.

Tim
LukeW:
"isolated DC-DC power supply"

"avoiding the need of a transformer if possible"

Use a big light bulb and a solar cell.

Or a motor-generator.
Marco:

--- Quote from: T3sl4co1l on November 08, 2018, 08:16:42 am ---The ones that do, cost twice as much.

--- End quote ---
Why though? Does Mean Well put a nugget of gold in each and every regulated module? Efficient market hypothesis is failing here.
T3sl4co1l:
It's all about market.  Correct.

As is the case with proof-by-contradiction, we can examine our premises and determine which ones are failing.

A nugget of gold, no, that would be uneconomical by any stretch. ;)

More silicon?  Likely.  A controller/regulator is needed, and cheap though they are in quantity, they're not quite as cheap as a pair of jellybean BJTs.

What does that leave?  A somewhat higher price leads to lower production numbers, which leads to much higher production costs per part.

Likely, the cost difference at equal quantity is only, say, 20 or 40%, but the quantity difference magnifies it.

Furthermore: since it's impossible for a regulated converter to compete in the same space as an unregulated one, they might as well move to an upscale market, targeting reinforced isolation for example, or reduced EMI.  RECOM's products are notoriously expensive ($20 for a 5W converter?), but equally high in quality and capability.  So, that would account for the last stage of cost difference.

Tim
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