Choosing the correct Inductor for a DC-DC step-up regulator - Part 2

RE: Choosing the correct Inductor for a DC-DC step-up regulator - Part 2

Andrew J — Sat, 15 Feb 2020 22:38:34 GMT

Great work Gene, there’s some useful testing and data here. The specification (or should I say generalisation??) that relates induction size to ripple is ok as far as it goes - I think your test data shows that it is as much related to load as it is to size. You may find that reaction to transient changes in load also affects choice: that was something I could never quantify as I didn’t (still don’t) have the test tools, but I think a larger inductance leads to slower reaction to transient changes.

RE: Choosing the correct Inductor for a DC-DC step-up regulator - Part 2

jc2048 — Sat, 15 Feb 2020 16:12:18 GMT

That's an impressive amount of work you've done there and some interesting results to dig through.

Having the second MOSFET in place of the rectifier is new to me. I've used synchronous buck converters, but hadn't realised manufacturers were now doing this kind of thing with boost converters to improve the efficiency [which shows how out of touch with things it's possible to get in just a few years.]

I think those are the best hand-made probe sockets I've ever seen. Mine are really scrappy by comparison.