Fuzzy on FET matching?

dantwomey · 14th November 2002, 07:40 PM

Is it just me or is Nelson's picture too fuzzy to read?

As a 'first-timer' I require very 'clear' instructions.

Regards,
Dan

till · 14th November 2002, 07:55 PM

Whats the problem? You want to know the IRFP244 is a N channel?

kristijan-k · 14th November 2002, 07:58 PM

Hello dantwomey,

Here it is the diagram for the matching.
Hopeing that it will be more clear to you.
Also, you can find the same procedure of matching
on the www.aussieamplifiers.com .

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

dantwomey · 14th November 2002, 07:58 PM

I couldn't reaf the G,D, and S labels on Nelson's pic.

Regards,
Dan

jwb · 16th November 2002, 05:04 AM

How can you get FETs that are all from the same wafer? I ordered the standard package from Digi-Key for IRFP140. I got 25 FETs in a sealed plastic rail with an IRF label on it. The FETs all have the same markings, and the rail has the same markings as well. Does that mean these FETs were all from the same lot/wafer/factory/galaxy?

skaara · 16th November 2002, 10:44 AM

Yes

Lucas_G · 16th November 2002, 03:46 PM

Hi Kristijan,

I have got a few questions left:

Is the IRF 9610 the P channel Mosfet and the 240 the N Channel?

Can I use a small piece of Alluminium as a temporary cooling device for the Mosfet during the testing/matching?
Should I wait a few minutes to let it reach a higher temperature?
Can I also use a 12 Volt DC 1000mA for this matching procedure?

With kindest greetings,

Lucas.

skaara · 16th November 2002, 04:21 PM

Youre right, 9610 is p channel and 240 is n

You can use piece of aluminium as a heatsink for matching. I would advise you that you use clock and read vgs of all mosfets at some time, when i was matching my 100 pcs of irfp240 i readed vgs exactly 30 secs after i connected each mosfet. You dont even need heatsink because mosfet doesnt get very hot in 30secs.

You can test them at 12v and 1000ma.

kristijan-k · 16th November 2002, 04:37 PM

Hello,

Use regulated power supply when matching the FETs.
The heatsinks are not required if you will properly try
to match the Fets.

Best regards,
Kristijan Kljuèariæ
http://web.vip.hr/pcb-design.vip

Lucas_G · 16th November 2002, 04:40 PM

Hi Skara,

Thanks! I will try your 30 seconds method.

I forgot to ask whether the BC 550 C (which I ordered as a substitute for the ZTX 450) should be connected as a P channel or N channel Mosfet while matching?

Kindest greetings,

Lucas.

14th November 2002, 07:40 PM	#1
dantwomey diyAudio Member Join Date: Feb 2002 Location: Canada	Fuzzy on FET matching? Is it just me or is Nelson's picture too fuzzy to read? As a 'first-timer' I require very 'clear' instructions. Regards, Dan

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14th November 2002, 07:55 PM	#2
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	Whats the problem? You want to know the IRFP244 is a N channel?

14th November 2002, 07:58 PM	#4
dantwomey diyAudio Member Join Date: Feb 2002 Location: Canada	I couldn't reaf the G,D, and S labels on Nelson's pic. Regards, Dan

16th November 2002, 05:04 AM	#5
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	How can you get FETs that are all from the same wafer? I ordered the standard package from Digi-Key for IRFP140. I got 25 FETs in a sealed plastic rail with an IRF label on it. The FETs all have the same markings, and the rail has the same markings as well. Does that mean these FETs were all from the same lot/wafer/factory/galaxy?

16th November 2002, 10:44 AM	#6
skaara diyAudio Member Join Date: Jun 2002 Location: Europe, Slovenia	Yes

16th November 2002, 03:46 PM	#7
Lucas_G diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi Kristijan, I have got a few questions left: Is the IRF 9610 the P channel Mosfet and the 240 the N Channel? Can I use a small piece of Alluminium as a temporary cooling device for the Mosfet during the testing/matching? Should I wait a few minutes to let it reach a higher temperature? Can I also use a 12 Volt DC 1000mA for this matching procedure? With kindest greetings, Lucas.

16th November 2002, 04:21 PM	#8
skaara diyAudio Member Join Date: Jun 2002 Location: Europe, Slovenia	Youre right, 9610 is p channel and 240 is n You can use piece of aluminium as a heatsink for matching. I would advise you that you use clock and read vgs of all mosfets at some time, when i was matching my 100 pcs of irfp240 i readed vgs exactly 30 secs after i connected each mosfet. You dont even need heatsink because mosfet doesnt get very hot in 30secs. You can test them at 12v and 1000ma.

16th November 2002, 04:37 PM	#9
kristijan-k diyAudio Member Join Date: Mar 2002 Location: CROATIA	Hello, Use regulated power supply when matching the FETs. The heatsinks are not required if you will properly try to match the Fets. Best regards, Kristijan Kljuèariæ http://web.vip.hr/pcb-design.vip

16th November 2002, 04:40 PM	#10
Lucas_G diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi Skara, Thanks! I will try your 30 seconds method. I forgot to ask whether the BC 550 C (which I ordered as a substitute for the ZTX 450) should be connected as a P channel or N channel Mosfet while matching? Kindest greetings, Lucas.

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