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Hockey Puck Aleph
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Old 13th April 2019, 02:10 AM   #1
woofertester is online now woofertester  United States
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Default Hockey Puck Aleph

I am considering a standard aleph configuration using only two of the pucks in the attached datasheet. One on top and one on the bottom.

The goal would be to crank up the bias current to be in the 3A to 5A realm with 24V (or higher) rails and be able to operate into a very low impedance load. The puck is rated at 1040W dissipation at 25 deg C.

My guess is that the gate capacitance of the puck may be a problem.

At the moment, I am waiting on PCBs for the F4 Beast prototype and am considering some variants.

Suggestion/comments/jeers welcomed.
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File Type: pdf IXTN660N04T4.pdf (171.0 KB, 134 views)
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Old 13th April 2019, 04:54 PM   #2
Nelson Pass is offline Nelson Pass  United States
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Hockey Puck Aleph
Looking at the SOA curve, we see that it is a 90 watt part at 30V, and
that assumes 25 deg C case temperature. With a 30V rail and an ordinary
heat sink you will probably enjoy safe bias currents at an amp or so.

Not that you shouldn't go ahead and try it....
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Old 13th April 2019, 06:30 PM   #3
woofertester is online now woofertester  United States
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Quote:
Originally Posted by Nelson Pass View Post
Looking at the SOA curve, we see that it is a 90 watt part at 30V, and
that assumes 25 deg C case temperature. With a 30V rail and an ordinary
heat sink you will probably enjoy safe bias currents at an amp or so.

Not that you shouldn't go ahead and try it....
I get your point. The SOA is pasted here.

So, if the voltage is dialed back to 20V, then 7A is inside the DC SOA and 3A bias may be safe?

The other question is how small can the Aleph sense resistors be and the circuit still function as an Aleph?
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Old 13th April 2019, 06:40 PM   #4
Zen Mod is offline Zen Mod  Serbia
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Hockey Puck Aleph
well , going for Aleph ..... you need that Vbe across upper source resistor

or , make it as fixed CCS in some other way , while obtaining proper modulation , so it still works as modulated CCS , with anything between 30 and 50% ( per wish) of sp called Aleph gain ( which is exactly percentage of contribution in output current)
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Old 13th April 2019, 07:15 PM   #5
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Default IXFN160N30T

From and SOA standpoint, this puck may be a better candidate for a high current single device Aleph. It is the IXFN160N30T. The datasheet does not show DC SOA but the DC SOA should be not very far inside the 1ms SOA curve. 5A at 30V should be safe for this device.
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Old 13th April 2019, 07:38 PM   #6
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Default IXFN520N075T2

This device's datasheet shows the DC SOA curve. At 30V Vds, it is a 300 watt DC part so biased in the 3A to 5A range should be safe?
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Old 13th April 2019, 07:41 PM   #7
indra1 is offline indra1  Indonesia
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Originally Posted by woofertester View Post
From and SOA standpoint,... does not show DC SOA ...
You'd better see Triode Transistor post #28 and #30.
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Old 13th April 2019, 08:45 PM   #8
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Originally Posted by indra1 View Post
You'd better see Triode Transistor post #28 and #30.
I agree. If the datasheet does not show DC SAO, time to move on to the next part.
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Old 13th April 2019, 08:57 PM   #9
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Default IXFN140N30P

This device looks promising. 700W DC Dissipation. 70A at 10V to 10A at 70V in a straight line.

In the 20V to 30V range, this part should have no problem being biased at 3A to 5A. 3A bias at 20V would be less than 10% of rated dissipation while 5A at 30V would be at 21% of rated dissipation. ....and.... it is not the most expensive puck on the ice rink.
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Old 13th April 2019, 09:12 PM   #10
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Hockey Puck Aleph
that one is good
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