240W Boost - 60W Buck Converter

Thread Starter

CineDroid

Joined Jan 25, 2020
20
I'm trying to gather material to help design a DC/DC regulator. I've landed on this paper by TI: http://www.ti.com/lit/an/slva535b/slva535b.pdf

I'm looking at the following performances and I was wondering if anyone already had other suggestions for topologies / reading material:
12v to 24v with continuous currents of 4A (10A peak)
24V to 12V with continuous currents of 4A (5A peak)

Input voltage provided by a battery.

Alternatively, knowing that I wanted to achieve a compact design, I've looked at Vicor CHiPs: http://www.vicorpower.com/dc-dc/isolated-regulated/dcm
But part of me wants to think it may be overkill (and very expensive) and that I may be able to do more (240W peak instead of 160W for instance) with less.
 
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Thread Starter

CineDroid

Joined Jan 25, 2020
20
I discovered TI's WeBench and here's a boost converter driven by their LM5155. There are two warnings I don't understand:
- It's switching using an ideal MOSFET. It calls for a 500V 100A MOSFET and I found this one that seems to fit the bill https://www.mouser.com/datasheet/2/389/sty139n65m5-957036.pdf. I'm wondering why the current in the switch gets so high in that topology?
- It seems that it would be unstable for loads under 4A.

For this application, I'm trying to handle variable loads drawing from 0.3A up to 4A continuous and 10A peak.
 

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