Power amp under development - Page 379

engel dela pena · 11th August 2012, 09:56 AM

hope this help
http://www.irf.com/technical-info/appnotes/an-936.pdf
In order to minimize these effects, stray circuit inductance must be minimized. This is done by keeping conduction paths as short
as possible, by minimizing the area of current loops, by using twisted pairs of leads, and by using ground plane construction.
Local decoupling capacitors alleviate the affects of any residual circuit inductance, once these measures have been taken.
Circuit layout should be kept as symmetrical as possible in order to maintain balanced currents in parallel connected HEXFET®s
or IGBTs. The gates of parallel connected devices should be decoupled by small ferrite beads placed over the gate connections, or
by individual resistors in series with each gate. These measures prevent parasitic oscillations.

engel dela pena · 11th August 2012, 10:10 AM

this is nice,
even when soldering,the soldering iron should be grounded

AndrewT · 11th August 2012, 10:21 AM

Use a resistor soldered directly to the FET gate PIN with a zero length connection lead.
The body of the resistor should be as close as possible (electrically) to the Gate inside the device. The physical construction of the mosFET prevents this ideal close coupling. Do what you can with what is presented outside the package.

sanbadgujar · 19th August 2012, 04:55 AM

HI can you give me pcb layout and componant list with power supply discription

AndrewT · 19th August 2012, 09:40 AM

Go to Quasi's site or go back through the Thread.

IRSound · 05:13 AM

Hi guys,

i want to use ACTRK600 for 2~16 Ohm.

rail voltages is about 75~80v DC and 85~90v for Higher rail.

what should i do if i want to use this amp for 2 ohm loads ?
increasing number of fets is enough ? i want to use IRFP31N50L (VISHAY) , because of higher Ids and Pd.(30A-460W)

www.vishay.com/docs/91220/sihfp31n.pdf

are 6 pair of IRFP31N50L enough for 2 ohm Loads ?

Regrards,
IRSound

don2007ksa · 18th November 2012, 09:35 PM

Hi NMOS when will you share your quasi complementary BJT design?as what you've said this will beat the NMOS amp.thank's

SAMCPI · 18th December 2012, 08:44 PM

hi all
pls tell me about 4uH Coil in Amplifier Actrk600 . I want full details
thank you

engel dela pena · 28th December 2012, 08:05 AM

post my nmos next time,hope to manage to get cam soon
see ya with my nmos 500

don2007ksa · 28th December 2012, 09:37 AM

can't wait the schematic of mr. engel's nmos 500,more power to you sir.

29th September 2012, 05:11 AM	#3786
IRSound diyAudio Member Join Date: Feb 2012	Hi guys, i want to use ACTRK600 for 2~16 Ohm. rail voltages is about 75~80v DC and 85~90v for Higher rail. what should i do if i want to use this amp for 2 ohm loads ? increasing number of fets is enough ? i want to use IRFP31N50L (VISHAY) , because of higher Ids and Pd.(30A-460W) www.vishay.com/docs/91220/sihfp31n.pdf are 6 pair of IRFP31N50L enough for 2 ohm Loads ? Regrards, IRSound Last edited by IRSound; 29th September 2012 at 05:13 AM.

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

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

11th August 2012, 09:56 AM	#3781
engel dela pena diyAudio Member Join Date: Oct 2005	hope this help http://www.irf.com/technical-info/appnotes/an-936.pdf In order to minimize these effects, stray circuit inductance must be minimized. This is done by keeping conduction paths as short as possible, by minimizing the area of current loops, by using twisted pairs of leads, and by using ground plane construction. Local decoupling capacitors alleviate the affects of any residual circuit inductance, once these measures have been taken. Circuit layout should be kept as symmetrical as possible in order to maintain balanced currents in parallel connected HEXFET®s or IGBTs. The gates of parallel connected devices should be decoupled by small ferrite beads placed over the gate connections, or by individual resistors in series with each gate. These measures prevent parasitic oscillations.

11th August 2012, 10:10 AM	#3782
engel dela pena diyAudio Member Join Date: Oct 2005	this is nice, even when soldering,the soldering iron should be grounded

11th August 2012, 10:21 AM	#3783
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Use a resistor soldered directly to the FET gate PIN with a zero length connection lead. The body of the resistor should be as close as possible (electrically) to the Gate inside the device. The physical construction of the mosFET prevents this ideal close coupling. Do what you can with what is presented outside the package.

19th August 2012, 04:55 AM	#3784
sanbadgujar diyAudio Member Join Date: Aug 2012 Location: Amravati Maharashatra	HI can you give me pcb layout and componant list with power supply discription

19th August 2012, 09:40 AM	#3785
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Go to Quasi's site or go back through the Thread.

18th November 2012, 09:35 PM	#3787
don2007ksa diyAudio Member Join Date: Mar 2008 Location: ksa	Hi NMOS when will you share your quasi complementary BJT design?as what you've said this will beat the NMOS amp.thank's

18th December 2012, 08:44 PM	#3788
SAMCPI diyAudio Member Join Date: Sep 2012 Location: Tehran	hi all pls tell me about 4uH Coil in Amplifier Actrk600 . I want full details thank you

28th December 2012, 08:05 AM	#3789
engel dela pena diyAudio Member Join Date: Oct 2005	post my nmos next time,hope to manage to get cam soon see ya with my nmos 500

28th December 2012, 09:37 AM	#3790
don2007ksa diyAudio Member Join Date: Mar 2008 Location: ksa	can't wait the schematic of mr. engel's nmos 500,more power to you sir.