|Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
||Thread Tools||Search this Thread|
|5th May 2010, 12:39 AM||#1|
Join Date: Dec 2008
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 ?
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|First Watt F4 ,F5, F6, F7, F8 ?||MikeW||Pass Labs||10||6th June 2015 08:56 PM|
|Soft/Slow start - high current - low voltage class A PS for a Pass F5 amp||sekess||Power Supplies||20||2nd February 2015 05:30 PM|
|First Watt F5 vs Aleph 5||Rony1||Pass Labs||59||25th November 2013 10:09 AM|
|First Watt F5 as I/V stage?||Skorpio||Pass Labs||0||1st May 2009 11:20 AM|
|Help with MOSFET selection||AudioGeek||Solid State||14||24th April 2005 03:25 PM|
|New To Site?||Need Help?|