IRFP90N20D Monster-Any good for Amplifiers?

zox2003 · 10th March 2005, 02:03 PM

Check this device out and let me know if is good for Mosfet Amp.
How much power we can get with pair of these?

Thanks.

IRFP90N20D

MikeB · 10th March 2005, 02:31 PM

According to the datasheet it's a "SMPS-Mosfet" for DC-DC converters.
Seems that it is fully designed/optimized for switching.
Also, the 6nF inputcapacitance is not easy to drive.
Maybe it's good for a multiple kilowatts ClassD ?

Mike

Workhorse · 10th March 2005, 03:19 PM

Hi ZOX ,
Being a N-channel mosfet amp manufacturer, I think now its my turn to say something!.

yes its a smps mosfet, but you can very well use this in Quasi-complementary amp. You have to design a good driver stage to drive this mosfet. the driver idle current must be at least 40-60mA in order to drive this huge gate capacitance along with good damping factor.
You can draw upto 300WRMS @ 4 ohms just from a single pair very easily.

regards,
Kanwar

richie00boy · 10th March 2005, 03:53 PM

I think you posted in a similar fashion to this a couple of days ago with another MOSFET. You would be better providing a link to the PDF datasheet as it is not enough to know just the voltage and current rating of the device. The wattage can be ignored for practical purposes in linear (class-b amp) use.

As I said last time, we need to see the safe operating area (SOA) graph. The input capacitance (Ciss) and gate charge (Qg) are also important parameters.

Stuart Easson · 10th March 2005, 03:57 PM

...is too high for normal aluminum/air cooling. You'd need something very high end to cool these properly. Perhaps water cooling, probably with a copper block and high flow rate, maybe even refrigerated. In any case, not for the uninitiated...

just my 2c

Stuart

zox2003 · 10th March 2005, 04:10 PM

Here is link to Data Sheet:

http://www.irf.com/product-info/data...irfp90n20d.pdf

What driver stage could be used to drive this "monster" MOSFET.
Any schematics?

Thanks

Workhorse · 10th March 2005, 04:20 PM

Hi guys,

Take a look at this APT20M18BVR MOSFET SOA, which is "A REAL MONSTER ".

regards,
kanwar

Workhorse · 10th March 2005, 04:27 PM

Hi guys,

The BIG DADDY of all DISCRETE semiconductors on the earth is this IGBT - APT100GF60LR, 600V- 100A device.
Take a look at its SOA curve.

we are using this in our project.

regards,
kanwar

Workhorse · 10th March 2005, 04:35 PM

Quote:

Originally posted by zox2003
What driver stage could be used to drive this "monster" MOSFET.
Any schematics?

Thanks

Hi ZOX,

You can very well use "INDIVIDUAL PUSH_PULL DRIVERS" for upper rail and lower rail mosfets to achieve excellent sink-source properties.

using conventional driver schems is not worth, as they perform very poor in terms of turn-off time domain of mosfets.

regards,
kanwar

zox2003 · 10th March 2005, 05:16 PM

Workhorse,

Can you post schematic with "good" drivers for these MOSFETs.
Thanks,

Zoran

10th March 2005, 03:19 PM	#3
Workhorse diyAudio Member Join Date: Dec 2004	Hi buddy Hi ZOX , Being a N-channel mosfet amp manufacturer, I think now its my turn to say something!. yes its a smps mosfet, but you can very well use this in Quasi-complementary amp. You have to design a good driver stage to drive this mosfet. the driver idle current must be at least 40-60mA in order to drive this huge gate capacitance along with good damping factor. You can draw upto 300WRMS @ 4 ohms just from a single pair very easily. regards, Kanwar __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

10th March 2005, 03:53 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I think you posted in a similar fashion to this a couple of days ago with another MOSFET. You would be better providing a link to the PDF datasheet as it is not enough to know just the voltage and current rating of the device. The wattage can be ignored for practical purposes in linear (class-b amp) use. As I said last time, we need to see the safe operating area (SOA) graph. The input capacitance (Ciss) and gate charge (Qg) are also important parameters. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

10th March 2005, 03:57 PM	#5
Stuart Easson diyAudio Member Join Date: Oct 2002 Location: Santa Cruz, CA	power density... ...is too high for normal aluminum/air cooling. You'd need something very high end to cool these properly. Perhaps water cooling, probably with a copper block and high flow rate, maybe even refrigerated. In any case, not for the uninitiated... just my 2c Stuart

10th March 2005, 04:10 PM	#6
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	Data sheet and driver question Here is link to Data Sheet: http://www.irf.com/product-info/data...irfp90n20d.pdf What driver stage could be used to drive this "monster" MOSFET. Any schematics? Thanks

10th March 2005, 05:16 PM	#10
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	schematic Workhorse, Can you post schematic with "good" drivers for these MOSFETs. Thanks, Zoran


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10th March 2005, 02:31 PM	#2
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	According to the datasheet it's a "SMPS-Mosfet" for DC-DC converters. Seems that it is fully designed/optimized for switching. Also, the 6nF inputcapacitance is not easy to drive. Maybe it's good for a multiple kilowatts ClassD ? Mike

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