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Old 11th August 2012, 09:56 AM   #3781
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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.
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Old 11th August 2012, 10:10 AM   #3782
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this is nice,
even when soldering,the soldering iron should be grounded
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Old 11th August 2012, 10:21 AM   #3783
AndrewT is offline AndrewT  Scotland
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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.
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Old 19th August 2012, 04:55 AM   #3784
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Location: Amravati Maharashatra
HI can you give me pcb layout and componant list with power supply discription
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Old 19th August 2012, 09:40 AM   #3785
AndrewT is offline AndrewT  Scotland
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Go to Quasi's site or go back through the Thread.
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Old 29th September 2012, 05:11 AM   #3786
IRSound is offline IRSound  Germany
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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.
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Old 18th November 2012, 09:35 PM   #3787
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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
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Old 18th December 2012, 08:44 PM   #3788
SAMCPI is offline SAMCPI  Iran
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Location: Tehran
hi all
pls tell me about 4uH Coil in Amplifier Actrk600 . I want full details
thank you
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Old 28th December 2012, 08:05 AM   #3789
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post my nmos next time,hope to manage to get cam soon
see ya with my nmos 500
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Old 28th December 2012, 09:37 AM   #3790
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Location: ksa
can't wait the schematic of mr. engel's nmos 500,more power to you sir.
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