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Switch mode PSU with linear output stage

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PinheadBE:
Hi,

I vaguely remember having seen a design of a PSU combining the best of both worlds, with a first switch mode stage for efficiency, followed by a linear LDO regulation stage for better noise performances

The two stages were kind of syncronized, so that the drop out voltage on the linear stage always remains minimized.

Does this ring a bell to anyone ?  Anyone remembers having seen this ?

Thanks a lot.

nctnico:
IIRC R&S has these kind of PSUs

PinheadBE:
I was looking for a design so that I could add a linear low-loss stage to a noisy switch mode PSU

Kean:
There are a bunch that work like this.  The switching section is set to be a few volts above the linear output stage.

I believe the R&S HMC804x PSU is considered a "linear switching" power supply, so high efficiency, low weight, and low-ish noise.  There are probably others they have like this.

The EEZ BB3 DCP405 module is an open design using this concept so you can check the schematics and I think they published some design notes on their website.  See https://www.envox.eu/dc-power-modules/dcp405-power-module/

coromonadalix:
some Kikusui has this topology

phase controlled /  buck / and end with some linear section

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