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OUPower.com • View topic - FET question/help

FET question/help

Here we will discuss many topics on electronic designs and circuits for various functions. PIC Chip programming has enormous potential in so many applications, that will be included in this forum as well.

FET question/help

Postby kevinsatterfield » Sun May 25, 2008 10:48 am

Does anhybody know a decent driver for an IRFK6H450?
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Postby SeaMonkey » Sun May 25, 2008 6:56 pm

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Postby kevinsatterfield » Mon May 26, 2008 1:01 pm

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High Power HexFet

Postby SeaMonkey » Mon May 26, 2008 8:55 pm

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Postby kevinsatterfield » Mon May 26, 2008 11:08 pm

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Postby kevinsatterfield » Tue May 27, 2008 9:06 pm

Your answer was just wat I needed but if you culd explain how you calculated the 8nf to get the 6amps wuld help even more .
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Postby Nick » Wed May 28, 2008 2:14 am

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Gate Drive characteristics and Circuit

Postby SeaMonkey » Thu May 29, 2008 1:59 am

Nick,

Very good suggestion.


Kevin,

The 8 nF gate capacitance is unique to that particular HexFet.

The 6 Ampere pulse requirement (for some very high power MosFets up to 9 Amperes) is the minimum recommended by circuit designers to assure very fast Turn On and Turn Off. The faster the HexFet is able to go to Full On when pulling a heavy current, the less heat will be developed as wasted power. And the same holds true for turning off; the faster it is able to Turn Off the less heat will be developed as wasted power.

The Turn On and Turn Off speed of the HexFet is very much dependent upon the ability of the gate driver circuit to charge the gate capacitance as quickly as possible for fast turn on, and later to discharge the gate capacitance as quickly as possible for fast turn off.

Therefore, the best driver circuits are those that can both "source" gate capacitor current for charge, and "sink" gate capacitor current for discharge.

For a pretty good tutorial "right click" and "save target as" to your preferred folder/subdirectory, then view it with your PDF viewer.
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Postby kevinsatterfield » Mon Jun 02, 2008 6:22 pm

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Postby SeaMonkey » Mon Jun 02, 2008 11:47 pm

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Postby kevinsatterfield » Fri Jun 06, 2008 12:01 am

Hi SeaMonkey,

Im wanting to build a versitile expierimenters power supply is all for now.
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Power Supply

Postby SeaMonkey » Fri Jun 06, 2008 4:29 pm

Kevin,

Very good! A versatile power supply is something that we all need.

What output voltage range and output current range are you shooting for?

Do you want it to be line powered (120 VAC) or automotive powered (14 VDC)?
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Postby kevinsatterfield » Fri Jun 06, 2008 5:45 pm

On a primary side of the box I'd like it to range from 0 - 600 V AC or DC with a current range from 0-60 amp constant current.
Ive been concentrating on a pulse section for a leg of the primary side , wat little time Ive had to spend on it so far.I hope everything fits inside an old desktop case'n from top to bottom, shlef like arrangement.The seconday sides I hope to range higher ...I just want it to do anything I culd possibly want it to do and have the ability to take paremeter measurments and then build appropiate power supplies for each project.... this thing I hope is capable of providing a way to keep bread boarding down .... hopefully elliminate breadboarding to some extent.
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Postby kevinsatterfield » Sat Jun 07, 2008 6:36 pm

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