LM5161: Topology with 9 isolated outputs

Part Number:LM5161

Hello,

I have to design a power scheme including a non-isolated 3.3 V rail and 9 individually isolated 3.3 V rails.

In the past I used LM5161 in fly-buck topology in order to generate 4 individually isolated rails with buck converters used to bring voltage down to 3.3 V, but with this new topology I'm not able to find a single transformer that does the job. Is there a way to generate all 9 isolated rails without using two or more converters?

I see there are many 6 1:1 windings isolated transformers on the market. I think I could take a couple of them and use their two primary windings in series as the non-isolated inductance of an LM5161, but what voltage should I expect on the 10 secondary windings?

Is there another simplest way to get the job done?

Thanks in advance.

Regards,

Stefano