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Xfmr design for smps

I have a couple questions, one is about identifying smps topology and the 2nd is about the 3rd winding in an example I found. I need to design a smps that can take

Vin: 70V to 105V and output 5V at 1A

I've chosen to use the mic9130

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On the front page of the datasheet there is a "Typical Application" schematic, which is not to far off from what I need to do, it's Vin: 36V to 72V Vout: 3.3V @ 4A

So, I think I'll copy that design, but now I have to design a transformer... from the reading I've done about this, looks like one of the first things I need to know is the topology of my smps. That's my question, can anyone tell me the topology of this smps example? Looks like an isolated synchronous buck converter... or maybe a forward converter? Also I don't see how the third winding is supplying the stead voltage to Vcc, according to the datasheet Vcc operates between 9V -18V (pg 3) confusingly on pg 8 it says Vcc is typically 8.5V....

much thanks!

Reply to
panfilero
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Buy an off-the shelf transformer:

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Its not forward. It is a flyback.

I'd check this website for a solution:

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--
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico@nctdevpuntnl (punt=.)
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Reply to
Nico Coesel

why do you say it's a flyback? it doesn't seem to be based on a buck- boost topology to me, flyback would mean it could buck and boost the input voltage, seems like it can only buck....

Reply to
panfilero

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