fets to class d

Tekko · 23rd October 2007, 07:58 AM

Are these suitable for class d amp ?

http://cgi.ebay.com/ws/eBayISAPI.dll...m=170161496855

phase_accurate · 23rd October 2007, 09:10 AM

They would be usable theoretically.

BUT: You won't need FETs that are capable of switching such high currents at this low voltage unless you want to build an amp to drive 1 ohm loads. Keep in mind that the disadvantage of this beefy FET is its high gate-charge and input capacity. So less beefy transistors may be easier to drive.

Regards

Charles

Tekko · 23rd October 2007, 09:32 AM

i´m not sure what to get, IRF640 ?

Dalus · 23rd October 2007, 11:05 AM

Get some IRFP450 fets they're really easy to drive just over 2 nF gate capacitance. I used them for http://www.youtube.com/watch?v=8SHabqEiUCA

Tekko · 23rd October 2007, 11:10 AM

I have 200 IRFP450´s but classd4sure said i shouldent bother with them.

Dalus · 23rd October 2007, 11:59 AM

I personally think you're fine with them as long as you use a decent gate driver such as http://focus.ti.com/docs/prod/folder.../ucc37321.html

Tekko · 23rd October 2007, 12:06 PM

I have a few UCC´s (sampled for a tesla coil project) a buncha IR2110´s and 4 HIP4080´s.

Dalus · 23rd October 2007, 12:15 PM

I would just give it a try and build a low power D-amp on a breadboard to see if it works.

Tekko · 23rd October 2007, 12:16 PM

I had a low power d-amp working nicely on breadboard using a TC4422 as output device.

Dalus · 23rd October 2007, 12:27 PM

I meant with a IRFP450 halfbridge as a output device.

23rd October 2007, 07:58 AM	#1
Tekko diyAudio Member Join Date: Jan 2005	fets to class d Are these suitable for class d amp ? http://cgi.ebay.com/ws/eBayISAPI.dll...m=170161496855

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
LME49830 with (HEX)Fets	Kay	Chip Amps	16	24th February 2009 03:13 AM
fets for aleph P1.7	potepuh	Pass Labs	18	22nd August 2006 04:21 AM
Help me in choosing fets	pamaz	Pass Labs	4	22nd August 2004 11:48 AM
Zen v4 with paralleled FETs	Stanislav	Pass Labs	15	4th March 2003 10:48 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

23rd October 2007, 09:10 AM	#2
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	They would be usable theoretically. BUT: You won't need FETs that are capable of switching such high currents at this low voltage unless you want to build an amp to drive 1 ohm loads. Keep in mind that the disadvantage of this beefy FET is its high gate-charge and input capacity. So less beefy transistors may be easier to drive. Regards Charles

23rd October 2007, 09:32 AM	#3
Tekko diyAudio Member Join Date: Jan 2005	i´m not sure what to get, IRF640 ?

23rd October 2007, 11:05 AM	#4
Dalus diyAudio Member Join Date: Jul 2006	Get some IRFP450 fets they're really easy to drive just over 2 nF gate capacitance. I used them for http://www.youtube.com/watch?v=8SHabqEiUCA

23rd October 2007, 11:10 AM	#5
Tekko diyAudio Member Join Date: Jan 2005	I have 200 IRFP450´s but classd4sure said i shouldent bother with them.

23rd October 2007, 11:59 AM	#6
Dalus diyAudio Member Join Date: Jul 2006	I personally think you're fine with them as long as you use a decent gate driver such as http://focus.ti.com/docs/prod/folder.../ucc37321.html

23rd October 2007, 12:06 PM	#7
Tekko diyAudio Member Join Date: Jan 2005	I have a few UCC´s (sampled for a tesla coil project) a buncha IR2110´s and 4 HIP4080´s.

23rd October 2007, 12:15 PM	#8
Dalus diyAudio Member Join Date: Jul 2006	I would just give it a try and build a low power D-amp on a breadboard to see if it works.

23rd October 2007, 12:16 PM	#9
Tekko diyAudio Member Join Date: Jan 2005	I had a low power d-amp working nicely on breadboard using a TC4422 as output device.

23rd October 2007, 12:27 PM	#10
Dalus diyAudio Member Join Date: Jul 2006	I meant with a IRFP450 halfbridge as a output device.