About
Philip Bassett
I write the articles and application notes on this site, and I am building switchmode.io.
Background
I have spent ten years in power electronics engineering, across defence and oil and gas, at DE&S and SLB among others.
What switchmode.io is
A browser-based tool for deciding whether a power supply approach will work before you commit to full simulation. You build the system from real parts, from any manufacturer, and it works out losses, efficiency, thermals, magnetics and stability across the connected stages rather than one stage at a time. It is not a simulator. It sits after the sketch and before LTspice or PLECS.
Why it is built in the open
An engineer will not trust a number they cannot trace, so the tool shows the curve, operating point and assumptions behind each result. The writing follows the same rule. The articles and notes take a problem all the way to component values, show the plots the answer comes from, and say where it stops holding. Publishing them as the work happens means the reasoning can be checked before anyone relies on it.
Application notes
Each note is a design procedure with a worked example and its limits, numbered so it can be cited.
- AN2026-01 RC Snubber Design: Sizing R and C from a Measured Ring
- AN2026-02 MOSFET Coss Loss in a Half-Bridge: Which Switch Pays, and How Much
- AN2026-03 Input Filter Damping: Sizing Rd and Cd to an Impedance Target
- AN2026-04 Dead Time in a Synchronous Buck: Choosing Both Edges from the Datasheet
Every article and note is on the resources page.