?????????

yahoo · 29th April 2011, 01:47 PM

hllo [can the irp640n replace the fqp50n06 without circuit damage or change to bias ] working on a ep 2500 what do you all think about this

jaycee · 29th April 2011, 02:07 PM

No, look at the drain current... 50A on the fqp50n06 versus 18A on the IRF640N. Also much higher RDS(on) for the IRF640N.

CBS240 · 29th April 2011, 05:49 PM

Hi

Rdson is not the only issue. First, the last two digits in the name FQP50N06 indicate this part has 60V DS breakdown. The IRF640N is 200V.

It appears this is a class H circuit. What is the function of the IRF640? Switching rail or linear outputs? There are 200V FQP components, but FQP is Fairchilds designation for thier TO-220 Q-fet or plainer stripe DMOS, the IRF die structure is a bit different as they are Hexfets. The planer stripe DMOS seem to be more robust, but Cgd is more significant particularly at Vds saturation in the planer stipe components, these differences may or may not be an issue in this circuit. My opinion to you is to view the IRF640N datasheet and look for a more suitable replacement.

wg_ski · 29th April 2011, 06:33 PM

They're just rail switches. In the original QSC RMX2450, the IRFZ44 was used. If you can't get the Farichilds, use the IRFZ48 or IRF1407.

CBS240 · 29th April 2011, 06:36 PM

uh Huh. Well the IRFZ44 is a much more comperable device to the FQP50N06.

29th April 2011, 01:47 PM	#1
yahoo diyAudio Member Join Date: May 2007	????????? hllo [can the irp640n replace the fqp50n06 without circuit damage or change to bias ] working on a ep 2500 what do you all think about this

29th April 2011, 05:49 PM	#3
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Hi Rdson is not the only issue. First, the last two digits in the name FQP50N06 indicate this part has 60V DS breakdown. The IRF640N is 200V. It appears this is a class H circuit. What is the function of the IRF640? Switching rail or linear outputs? There are 200V FQP components, but FQP is Fairchilds designation for thier TO-220 Q-fet or plainer stripe DMOS, the IRF die structure is a bit different as they are Hexfets. The planer stripe DMOS seem to be more robust, but Cgd is more significant particularly at Vds saturation in the planer stipe components, these differences may or may not be an issue in this circuit. My opinion to you is to view the IRF640N datasheet and look for a more suitable replacement. __________________ All the trouble I've ever been in started out as fun......

29th April 2011, 06:36 PM	#5
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	uh Huh. Well the IRFZ44 is a much more comperable device to the FQP50N06. __________________ All the trouble I've ever been in started out as fun......

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29th April 2011, 02:07 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	No, look at the drain current... 50A on the fqp50n06 versus 18A on the IRF640N. Also much higher RDS(on) for the IRF640N.

29th April 2011, 06:33 PM	#4
wg_ski diyAudio Member Join Date: Oct 2007	They're just rail switches. In the original QSC RMX2450, the IRFZ44 was used. If you can't get the Farichilds, use the IRFZ48 or IRF1407.

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