MOSFET Output Pair Suggestions ??

sam9 · 22nd September 2003, 07:08 PM

I've made a couple of small BJT amps in the low power range (15V-30V) and I thinking about doing something similar using MOSFETs in a SF configuration. Physical size is a factor so I'm looking for a TO-220 package. Scanning the usual catalogs (DMgikey, Mouser, etc) it is hard to figure out what would constitute a complimentary pair.

Any suggestions in this regard? Naturally it would be nice if they were readily available.

PMA · 22nd September 2003, 07:17 PM

IRF540/9540

DrG · 22nd September 2003, 07:53 PM

In your specified voltage range IRF510 / IRF9510 would probably suffice.

millwood · 22nd September 2003, 09:08 PM

I would 2nd PMA's suggestion.

My experience with those mosfets tho. is that they are not very stable in anything other than an EF-equivalent set-up.

Other than that, those are great output devices, impossible to blow-up,

.

BTW, those aren't complimentory pairs. The Hitachi pair is but they are expensive.

blmn · 23rd September 2003, 12:17 AM

As millwood said, they are not complimentary. For example, different gate capacitances must be considered during the design.

regards

sam9 · 23rd September 2003, 01:07 AM

Thanks for the input. I found SPICE models at the DuncanAmp website, so I will be working with those for a while. At least then I will have some idea what the likelyhood of getting ssomething satisfactory will be.

22nd September 2003, 07:08 PM	#1
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	MOSFET Output Pair Suggestions ?? I've made a couple of small BJT amps in the low power range (15V-30V) and I thinking about doing something similar using MOSFETs in a SF configuration. Physical size is a factor so I'm looking for a TO-220 package. Scanning the usual catalogs (DMgikey, Mouser, etc) it is hard to figure out what would constitute a complimentary pair. Any suggestions in this regard? Naturally it would be nice if they were readily available.

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22nd September 2003, 07:17 PM	#2
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	IRF540/9540

22nd September 2003, 07:53 PM	#3
DrG diyAudio Member Join Date: Aug 2003 Location: South Africa	In your specified voltage range IRF510 / IRF9510 would probably suffice.

22nd September 2003, 09:08 PM	#4
millwood Account Disabled Join Date: Apr 2003 Location: US	I would 2nd PMA's suggestion. My experience with those mosfets tho. is that they are not very stable in anything other than an EF-equivalent set-up. Other than that, those are great output devices, impossible to blow-up, . BTW, those aren't complimentory pairs. The Hitachi pair is but they are expensive.

23rd September 2003, 12:17 AM	#5
blmn diyAudio Member Join Date: Feb 2001 Location: .	As millwood said, they are not complimentary. For example, different gate capacitances must be considered during the design. regards

23rd September 2003, 01:07 AM	#6
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Thanks for the input. I found SPICE models at the DuncanAmp website, so I will be working with those for a while. At least then I will have some idea what the likelyhood of getting ssomething satisfactory will be.