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Old 29th October 2008, 11:12 AM   #1
croccodillo is offline croccodillo  Italy
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As per title, I have a lot of such a device; THIS is the supplier datasheet.

Can this Mosfet be used for an Aleph Mini/Aleph J?

The characteristics are not too bad, the only "problem" I can see is the relatively high input capacitance, at 2900 pF; but I can try to increase the driver current, in manner to drive them in a better way.

What do you think? Would I try them in my Aleph?
I have them for free, I have about 20/30 pieces, so I could even try to match them.

Ciao,
Giovanni
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Old 29th October 2008, 01:56 PM   #2
h_a is offline h_a  Europe
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Pretty hefty parts! Large transconductance, even large than good old IRFP240, but of course at the cost of larger capacitances.

For the Mini-A they appear fine to me; if I remember correctly the Mini-A has the original Mosfet-differential, so bias current should be plenty (needs quite a bit of current to get the mosfets in the LTP into the more linear region). Otherwise biasing them up should not be hard and needs only a little heatsinking.

The AlephJ is a bit different; you can try it. There were some discussions that a J109BL can drive even 2 fets, however I don't remember if somebody really tried.

Increasing bias in the frontend is however not significantly possible (power dissipation in the jfets, IDSS limit).

Have fun, Hannes
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Old 29th October 2008, 03:47 PM   #3
Nelson Pass is offline Nelson Pass  United States
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You could probably use one of these for every two of the IRFP240.

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Old 29th October 2008, 04:03 PM   #4
croccodillo is offline croccodillo  Italy
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Thank you Hannes, actually I have to follow the Aleph Mini/3 way, not the J way...


Quote:
Originally posted by Nelson Pass
You could probably use one of these for every two of the IRFP240.


That was exactly my idea... of course such a beast need more bias, so I can use a single pair for channel, like an Aleph Mini, but with a bias current, let's say, of about 2 amps.

Thank you very much.

Ciao,
Giovanni
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