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Another rather old Design I made way back in 2018 out of the necessity for multiple Isolated Power Rails. I Design Power Supplies and other Power Electronics and I almost always need 1 or more Isolated Bias / Auxiliary Power rails for Controller Electronics, Voltage / Current Displays, etc. So I Designed this 5 Rail Isolated DC-DC Fly-Buck Converter with a Customized(DIY) Toroid Transformer to be more Flexible.
It is a Max 16Watt, 20-24V Input and up to 20V Output Fly-Buck Converter with 4 Fully Isolated Rails and 1 Input Ground Referenced one (the Buck Rail) that is also the Regulated one. The 4 other Rails are Tracking(more or less) the Primary regulated one through the tight Coupling of the Windings.
Bcs of the so-so Regulation of the 4 Isolated Rails with the Primary Rail(Bcs of the Fly-Buck concept) it is intended to be used with an LDO Post regulator and LC+Ferrite Bead Filtering for sensitive analog Circuits.
!!! W A R N I N G !!!
!!!! Do NOT use this Circuit in any MAINS related Application !!!!
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When using the Transformer for High Voltage Rail Isolation use ONLY:
1) TIW (Triple Isolated Wire)
www.block.eu/fileadmin/2c9ee4...
or
2) FIW (Fully Insulated Wire)
www.elektrisola.com/en/Fully-...
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WÜRTH Designing Buck Converters with Isolated Outputs:
www.we-online.com/components/...
TI AN-2292 Designing an Isolated Buck (Fly-Buck) Converter:
www.ti.com/lit/an/snva674c/sn...
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