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High Current MosFet selection for First Watt F5
High Current MosFet selection for First Watt F5
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Old 4th May 2010, 11:39 PM   #1
Uunderhill is offline Uunderhill  Canada
diyAudio Member
Join Date: Dec 2008
Default High Current MosFet selection for First Watt F5

The schematic for the First Watt F5 shows an IRFP 240 and IFRP 9240 in the output stage.

However, continous Id = 12 Amps for the IRFP 9240 p channel MOSFET.

Other DIY'ers have suggested Toshiba 2sk1530 / 2sj201 or 2sk3497 / 2sj618 partnerings.
However, these are also limited to 10 or 12 Amps.

Vgs(off) is between 2v to 4v for all of these Mosfets.

Gamut Amplifiers also use a single Mosfet pair per channel, but have much higher power ratings.
Also, what I consider to be important - very low output Impedance.

Years ago I designed a 1 hp DC motor speed controller with a FB180SA10 Mosfet.
This beast can handle 120 Amps @ 100 oC with a channel resistance of 0.0065 Ohms.

One possible p Channel Mate is a IXTN90P20P, rated at a meager 90 Amps @ 25 oC.

Both these MosFets also have a Vgs(off) between 2v and 4v.

The problem is they are about $35 each.

Does any one have any other suggestions for high current Mosfet's for a First Watt F5 ?
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