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Old 13th April 2019, 09:46 PM   #11
woofertester is offline woofertester  United States
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Default IXFN180180N15P

This one is almost identical to the one just above. This one has a DC dissipation 680W vs 700W for the one above. The SOA curve pasted here starts at 1V where the device just above starts its SOA curve at 10V.
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Old 13th April 2019, 10:09 PM   #12
woofertester is offline woofertester  United States
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Default IXTN90NL25L2

Here is a third candidate. DC power dissipation 735W. Very similar SOA to the two good candidates above.

The interesting thing about this datasheet is that it shows SOA for Tc of 75 deg C. SOA decreases by almost 1/2 comparing 25C to 75C.
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Old 13th April 2019, 10:25 PM   #13
Zen Mod is offline Zen Mod  Serbia
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if SOA iz OK , then choose by capacitances
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Old 13th April 2019, 10:39 PM   #14
woofertester is offline woofertester  United States
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Originally Posted by Zen Mod View Post
if SOA iz OK , then choose by capacitances
Agreed. I want to finish the survey of SOA candidates and then choose one. To your point, I have viewed more than one of the puck datasheet where the capacitance makes some crazy squiggles which caused me to move on to the next device. At the moment, I am only looking at devices in stock at Digikey.
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Old 13th April 2019, 10:48 PM   #15
woofertester is offline woofertester  United States
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Default IXFN100N60P

Edit: part number IXFN100N50P


Here is the grand daddy of them all so far. 1040 watts DC dissipation.

At 30V Vds, the highest SOA current would calculate to 34.7 amps. That is about were the SOA curve is on the attached graph.

The capacitance curves are nicely behaved at 30V.

So far, this is the favorite for being able to bias it heavily.
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Old 13th April 2019, 11:59 PM   #16
Nelson Pass is offline Nelson Pass  United States
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Don't be too sure.

Recommended reading:

https://ntrs.nasa.gov/archive/nasa/c...0100014777.pdf

I like the quote at the top of page 9:

"the auto industry had found the problem in 1997. JPL then
reverted to “older parts,” and trusted the manufacturer to advertise
the problem; however, this never occurred"

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Old 14th April 2019, 12:43 AM   #17
woofertester is offline woofertester  United States
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Originally Posted by Nelson Pass View Post
Don't be too sure.

Recommended reading:

https://ntrs.nasa.gov/archive/nasa/c...0100014777.pdf

I like the quote at the top of page 9:

"the auto industry had found the problem in 1997. JPL then
reverted to “older parts,” and trusted the manufacturer to advertise
the problem; however, this never occurred"

Wow. Thank you for the link and the nudge. I skimmed it quickly and it is not a skim kind of paper. It will take some time to digest.

Maybe I should rig up a test circuit with some lesser expensive MOSFETs to investigate the thermal runaway.
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Old 14th April 2019, 04:01 PM   #18
indra1 is offline indra1  Indonesia
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Originally Posted by woofertester View Post
... the thermal runaway.
An article from Ixys Article_Linear_Power_MOSFETs_2007.pdf.
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Old 14th April 2019, 05:06 PM   #19
Nelson Pass is offline Nelson Pass  United States
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That's a good one also, although the NASA paper and this one seem to
assign somewhat different causes to the problem.

In the Ixsys, they have solved it as follows:

"Every transistor cell is designed with a ballast resistor at the source
to limit its current."

In other words big die with many individual internal ballast resistors.

One of the draws to the big die transistors would be the ability to run
a large output stage without degeneration, making the most of the
square law character. Internal ballast resistors makes this less
attractive.

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Old 14th April 2019, 05:20 PM   #20
Zen Mod is offline Zen Mod  Serbia
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though, someone found some worthy of implementation

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