Trying to find a high-speed, high-power transistor to use as a switch

I have not used them (linear or otherwise), although I'm interested. IGBTs passed me by, they were not taught when I was at uni, and I didn't come across them in any on-the-job (or otherwise) applications or training. I missed out. And now there are interesting high power and voltage semiconductors like SiC for high power or GAN for power+speed, so I'm unsure when IGBTs would be selected (presumably they are lower-cost than SiC). I've experimented a bit with SiC parts for switching, but even the experiments end up pricey.

Is that the OG DS1102E?

Your famous

Congrats!

You can use them like NPN power transistors (no one makes P type parts any more) . They are quite cheap and have good but not perfect SOA.

This design was done initially to make 55V 5A power supplies for audio nonsense (replicating ancient Mullard transistor designs). Its very loosely based on the power supply design for the Quad 303 power amp.

If you want to build one I'll sort out the component values  - I must have written them down somewhere.

I might even have a board left.

Note the position of the N type sereis pass device in the negative rail !

The load goes across J2 and pin 2 of J2 is typically connected to the system ground.

The rectifier got way too hot at 5A - so a had to bodge the heatsinks.

This pic is a dual 12V version, that's a 200VA transformer with two separate 12V secondaries.

MK

yes. Sold it, used the money to buy my next scope.

Also: self-promoting my GaN KiCAD design:  Hercules LaunchPad and GaN FETs - Part 2: Make a BoosterPack 

The top layer looks like a nice cozy spot for a good quality decoupling capacitor

What am I missing TI?

I studied IGBT in the last years of university, in the late 80s and early 90s. I still have Ned Mohan's 1989 book at home: "Power Electronics: Converters, Applications and Design". In the book he classified IGBTs as switching devices with medium power capacity, 1200 V / 100 A, and medium switching speed similar to BJTs. Surely things have changed a lot since then. Then I was lucky enough to lead a project to change the UPS in the newsroom of a newspaper where I worked to UPS that used IGBTs.

This looks great, thank you! I haven't worked with RF power transistors before. Would you recommend specific manufacturers or types? Is there anything I should keep in mind while looking into these?