Best DC/DC Topology

[BorisRap]

Good day,

I have to design an isolated DC/DC converter. Here are some specs:

Vin: wide range (from 100VDC to 400VDC) or 400V fixed from PFC.
Vout: adjustable voltage from1.7VDC to 18VDC
Iout: 20A max (at any voltage)
Efficency: I know the efficency will be peak only at one volatge/current so I'd say around 92%+ at 18V 20A

Which topology would you recommend that allows to have such a big output range?

I've been investigating and I found Phase-Shifted Full-Bridge could be a good option.

I found this controller from TI UCC28951 that looks quite good. But I don't know it enables to put a potentiometer in the feedback loop and adjust down to 1.7V
Datasheet: https://www.ti.com/lit/ds/symlink/ucc28951.pdf?ts=1715952028390&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Facdc-dcdc-controllers%252Fproducts.html

Would you recommend any other topology for my needs? Thank you!

[aliarifat794]

I am not sure about the potentiometer in the feedback loop that you are talking about. However, ucc28951  Phase-Shifted Full-Bridge Controller for Wide-Input Voltage Range
Applications is usable for PSFB topology.
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/957006/ucc28951-how-to-select-or-design-shim-inductor-for-psfb-topology