Electronics > Projects, Designs, and Technical Stuff

DC load using a CPU cooler

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rob77:

--- Quote from: Mr.B on October 13, 2014, 07:34:27 pm ---The IXTH75N10L2 has about 20mOhms.
The IXTH30N50L2 has about 215mOhms.
In the bigger scheme of things, is it going to make a lot of difference?

--- End quote ---

Rdson is unimportant unless you're planning to build a dummy load capable of tens of amperes at 1 V or less ;)

Mr.B:
Exactly rob77.
In my design I am not wanting to do anything under about 3v3 anyway.

Mr.B:
@AcHmed99 - Yes, they have exceptional thermal characteristics.
However, I have already spent NZD 250 on the IXTH30N50L2.

On the subject of thermal...
The IXTH30N50L2 has a Tjmax of 150 deg C.
Datasheet attached.
Expert experience question: How hard can you safely push it?
140 deg C?
6.66% de-rated?

rob77:

--- Quote from: Mr.B on October 14, 2014, 01:04:57 am ---@AcHmed99 - Yes, they have exceptional thermal characteristics.
However, I have already spent NZD 250 on the IXTH30N50L2.

On the subject of thermal...
The IXTH30N50L2 has a Tjmax of 150 deg C.
Datasheet attached.
Expert experience question: How hard can you safely push it?
140 deg C?
6.66% de-rated?

--- End quote ---

check the datasheet for thermal de-rating factor - it might be a surprisingly high number (a 100W mosfet can easilly become 40W max at high temperatures)

Jeroen3:
I was looking at the linearity of the Id/Vgs curve. It's not ideal if the fet goes from 0 to Imax in a window less than 1 Volts.
The IXTP or IXTH15N50L2 seems nice for this purpose, you have less risk of instability when you're running milliamps.
And it's affordable on digikey and an ebay seller.

I'll look into the ones named above tonight. (EU time)

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