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Old 10th March 2005, 03:03 PM   #1
zox2003 is offline zox2003  United States
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Lightbulb IRFP90N20D Monster-Any good for Amplifiers?

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
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Old 10th March 2005, 03:31 PM   #2
MikeB is offline MikeB  Germany
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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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Old 10th March 2005, 04:19 PM   #3
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Cool 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
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Old 10th March 2005, 04:53 PM   #4
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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.

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Old 10th March 2005, 04:57 PM   #5
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Default 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
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Old 10th March 2005, 05:10 PM   #6
zox2003 is offline zox2003  United States
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Unhappy 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
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Old 10th March 2005, 05:20 PM   #7
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Cool Hi everyone

Hi guys,


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


regards,
kanwar
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Old 10th March 2005, 05:27 PM   #8
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Cool +++more

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
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Old 10th March 2005, 05:35 PM   #9
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Cool Re: Data sheet and driver question

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
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Old 10th March 2005, 06:16 PM   #10
zox2003 is offline zox2003  United States
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Default schematic

Workhorse,

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

Zoran
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