A gate driver circuit

At 30 volts into a 220 ohm load at 1 MHz she get a lil warm to the touch. Don't run it up much higher than that with that load or you're going to burn your fingertip and I'm fresh out of ice cream sammies.

The bummer about most integrated gate drivers is the high prop delay.

But is $4 really an issue?

That's the most expensive part i've ever blown!

I guess the guys in the auto repair biz have it worse, though

The total prop delay on this is 79 ns, falling edge. That seems better than most.

Oh hey, it looks like you can get 'em for $2.16 in quantities of 100 direct from Analog. Mouser's discount is only $3.47. way to undercut your distributors

What about 5 or 10MHz into a modest capacitance- only load? Test temp with wetted fingertip, is OK if it doesn't sizzle, or sizzles slowly.

We recently fried a couple of $200 distributed amplifier chips. I've done better at the system level.

I can touch a 50C surface for many seconds, 60C for about 1 second, and can interpolate reasonably well. That's easier than setting up a thermocouple or the FLIR.

For a serious gate driver, like slamming a Cree SiC at 5 MHz, you've got to roll your own. DEI/IXYS used to makes some real beasts, but I think they are gone now.

I learned at some point to bill the client for a few spares of all the pricey-bits due to "development mishaps" on a prototype upfront they seem more amenable to that at the beginning of a project than if you tell them late in the game "Yeah so I blew up the output stage please add $X to you bill"

tirsdag den 28. april 2020 kl. 18.05.58 UTC+2 skrev snipped-for-privacy@highlandsniptechnology.com:

I seem remember that back in the day 50C was the safety limit for user touchable parts like exposed heatsinks and such

I'll try that (with the good ones!)

These should draw about 2-3mA quiescent. if it starts drawing 70mA from the supply in the test circuit immediately with no signal, welp it's a goner.

They're thermally protected but 2x overvoltage on the secondary does seem to kill 'em reliably. Thinking about adding a Zener + small SCR crowbar daughter-board for when I test them in future but IDK if it will react fast enough; zapping $5 parts may be no big loss for JL but that's an ouch for a one-man shop!

Talk a rep out of some samples!

The more elegant term on the invoice is "consumables."

Their sample policy for the hoi polloi is a bit stingy, 4 parts per request per month and no more than 2 of any single part. These ship from Singapore and take two weeks, hardly worth it.

Their corporate HQ is right down the street in Norwood MA, last time I tried to even talk with a rep they kinda want your life story first, who are you, who do you work for, what are you working on, how many you gonna sell, how soon.

They seem like a typical very top-down stodgy New England tech company. Prolly why they're still in New England.

One thing Maxim is pretty good at is the samples. Kinda like a drug dealer I suppose.

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I think drug dealers are usually able to sell you more of the product after they get you hooked ;)

Creative fiction can help.

They'll never EOL heroin.

"You don't _have_ to give me more samples. If you, y'know. Hate America"

at 30 volts on Vdd2 into a 100 pf load looks like it drops into thermal protect at about 5MHz, 50% duty cycle. Output looks fine up until around that point, though.