Help with irfp240

kzeprf22 · 13th November 2010, 04:59 AM

Hi I ahve a situation where I use Vishay IRFP240 nad with VDS=24V and VGS 3.8V i GET 1,4 AMPERES. The datashheet shows tha I need 4.8v for 1.4 amperes. In a same circuit that I use IR mosfets I need 4.87 VGS for 1. 3 ampere. Is this is normal? Are the mosfets fake Is anything else wrong?

godfrey · 13th November 2010, 05:17 AM

The datasheet shows typical values. There can be a big variation from device to device.

kzeprf22 · 13th November 2010, 05:21 AM

Thanks for the reply, but have different acoustic behavour and i have to deliver this asap.

Bill Fuss · 13th November 2010, 10:55 AM

No, they will be fine. They must match if you are paralleling them.

Bksabath · 13th November 2010, 12:15 PM

May be worth knowing the temperature?

But to me Bill Fuss is right

Bill Fuss · 13th November 2010, 12:19 PM

What do you mean, knowing the temperature?

kzeprf22 · 13th November 2010, 02:31 PM

Yes they was fine. Because I used to use a lot irf240 I knew the voltage I needed. So it was starnge to me taken these new devices that they neede only 3.8 vgs for 1.4 amps. Anyway everything is fine. Thnks for the replies

13th November 2010, 04:59 AM	#1
kzeprf22 diyAudio Member Join Date: Apr 2007	Help with irfp240 Hi I ahve a situation where I use Vishay IRFP240 nad with VDS=24V and VGS 3.8V i GET 1,4 AMPERES. The datashheet shows tha I need 4.8v for 1.4 amperes. In a same circuit that I use IR mosfets I need 4.87 VGS for 1. 3 ampere. Is this is normal? Are the mosfets fake Is anything else wrong?

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13th November 2010, 05:17 AM	#2
godfrey diyAudio Member Join Date: Nov 2009 Location: Cape Town	The datasheet shows typical values. There can be a big variation from device to device.

13th November 2010, 05:21 AM	#3
kzeprf22 diyAudio Member Join Date: Apr 2007	Thanks for the reply, but have different acoustic behavour and i have to deliver this asap.

13th November 2010, 10:55 AM	#4
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	No, they will be fine. They must match if you are paralleling them.

13th November 2010, 12:15 PM	#5
Bksabath diyAudio Member Join Date: Dec 2007	May be worth knowing the temperature? But to me Bill Fuss is right

13th November 2010, 12:19 PM	#6
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	What do you mean, knowing the temperature?

13th November 2010, 02:31 PM	#7
kzeprf22 diyAudio Member Join Date: Apr 2007	Yes they was fine. Because I used to use a lot irf240 I knew the voltage I needed. So it was starnge to me taken these new devices that they neede only 3.8 vgs for 1.4 amps. Anyway everything is fine. Thnks for the replies

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