IRFPS37N50A or IRFBA22N50A as o/p devices

phoenix87 · 20th November 2010, 10:35 PM

both the above mentioned devices are hexfet from irf with 500V rating . i wanted to know although they have high gate capacitance can they be use as o/p devices . if so then how to counter act the problem of high gate capacitance and if nt why so .

regards
phoenix

sekhar · 21st November 2010, 07:10 AM

here is my 2cent i dont know much bout these stuff but it will be difficult using devices due to high gate capacitance........ neways more experienced people will guide u ...........

regards
sekhar

CBS240 · 21st November 2010, 07:34 AM

What kind of amp are you making? Quasi? What power level into what load Z? If you intend to make a complementary amp, you will need a P-ch of relatively the same conductance. Is this amp to be a common drain or a common source output stage? There is quite a difference. Class A or what? Is it that you already have these components or are you deciding on which components of these type to obtain?
BUT.....

Details are needed to determine a proper driving circuit.

phoenix87 · 21st November 2010, 08:35 AM

Quote:

Originally Posted by CBS240

What kind of amp are you making? Quasi? What power level into what load Z? If you intend to make a complementary amp, you will need a P-ch of relatively the same conductance. Is this amp to be a common drain or a common source output stage? There is quite a difference. Class A or what? Is it that you already have these components or are you deciding on which components of these type to obtain?
BUT.....

Details are needed to determine a proper driving circuit.

actually i am looking for 600W @ 4E and near bout 1000W @ 2E. i am looking for quasi design and i want the amp to be a class AB with rail switching ie class H .......... can these details help in designing the driving circuit ......

regards
phoenix

Workhorse · 21st November 2010, 01:41 PM

Quote:

Originally Posted by phoenix87

actually i am looking for 600W @ 4E and near bout 1000W @ 2E. i am looking for quasi design and i want the amp to be a class AB with rail switching ie class H .......... can these details help in designing the driving circuit ......

regards
phoenix

High gate capacitance is not the problem.
Do you have a proper conceptual schematic for your class-H ?

phoenix87 · 21st November 2010, 06:03 PM

i was thinking of modifing the apex b500 to a quasi complementary one with the step driver from h900.............. will it be possible .....????????????

regards
phoenix

Workhorse · 23rd November 2010, 05:08 AM

B500 using mosfets in quasi-complementary is not correct way

phoenix87 · 23rd November 2010, 05:18 AM

Quote:

Originally Posted by Workhorse

B500 using mosfets in quasi-complementary is not correct way

ok workhorse as u say then how how about LEGENDSTAGE MK2 or Quasor from DR Bora. But may i ask why is B500 not a good idea

regards
Sekhar

Workhorse · 23rd November 2010, 05:50 AM

Noise injection from lower switched bus will break into oscillations, as the negative rail output devices are configured as CFP.

phoenix87 · 23rd November 2010, 06:11 AM

workhorse why dont u suggest a design ..........

regards
sekhar

20th November 2010, 10:35 PM	#1
phoenix87 diyAudio Member Join Date: May 2010	IRFPS37N50A or IRFBA22N50A as o/p devices both the above mentioned devices are hexfet from irf with 500V rating . i wanted to know although they have high gate capacitance can they be use as o/p devices . if so then how to counter act the problem of high gate capacitance and if nt why so . regards phoenix

21st November 2010, 07:34 AM	#3
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	What kind of amp are you making? Quasi? What power level into what load Z? If you intend to make a complementary amp, you will need a P-ch of relatively the same conductance. Is this amp to be a common drain or a common source output stage? There is quite a difference. Class A or what? Is it that you already have these components or are you deciding on which components of these type to obtain? BUT..... Details are needed to determine a proper driving circuit. __________________ All the trouble I've ever been in started out as fun......

23rd November 2010, 05:08 AM	#7
Workhorse diyAudio Member Join Date: Dec 2004	B500 using mosfets in quasi-complementary is not correct way __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

23rd November 2010, 05:50 AM	#9
Workhorse diyAudio Member Join Date: Dec 2004	Noise injection from lower switched bus will break into oscillations, as the negative rail output devices are configured as CFP. __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

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21st November 2010, 06:03 PM	#6
phoenix87 diyAudio Member Join Date: May 2010	i was thinking of modifing the apex b500 to a quasi complementary one with the step driver from h900.............. will it be possible .....???????????? regards phoenix

23rd November 2010, 06:11 AM	#10
phoenix87 diyAudio Member Join Date: May 2010	workhorse why dont u suggest a design .......... regards sekhar

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