Electronics > Projects, Designs, and Technical Stuff

DC load using a CPU cooler

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SeanB:
300C for 10 seconds on the LEADS, not the case. While you probably could get away with reflowing them at 250C in an IR oven to reflow it to a copper clad board you would be severely stressing the package attachment.  Brazing at 300C will probably cook the case off.

mrflibble:

--- Quote from: eneuro on October 11, 2014, 06:08:47 pm ---
--- Quote from: mrflibble on October 11, 2014, 07:14:22 am ---Unless I am missing something, in which case please explain.

--- End quote ---
I wrote about those instructions in post #118  ;)
I found there  How to Spot Weld Copper those instructions, and applying brazing in 1st step is a key to do it.

--- End quote ---
I thought you might have meant that, but better to be sure. Reason I asked is because even that article you linked to refers to the joining action as spot welding, as opposed to brazing. Anyways, that's semantics, now I know what surface joining action you mean.

I suspect many molten mosfets lay in your path to enlightenment, but we'll await your experiment results. ;D

eneuro:

--- Quote from: SeanB on October 11, 2014, 06:14:35 pm ---300C for 10 seconds on the LEADS, not the case.
--- End quote ---
300*C on TO220 tap was taken only as comparision to its leads solder temperature 1.6mm from case, since I'm not sure if there are tap soldering temperatures and time in datasheet ;)

Jeroen3:
Earlier in this topic there was talk about an IXYS mosfet. Which one if I may ask?
IXYS seems be manufacturing quite fancy stuff. But the seemingly most effective is an depletion mode, which equals to a short without a control supply.

Those TO-247's and 264's are great for mounting underneath cpu coolers. Don't fool around with TO-220.  ;)

microbug:
I just sent an email to an IXYS sales representative in the UK asking for two IXTH75N10L2 N-channel enhancement-mode MOSFETs. The first sales rep (h-rep) turned me down, and I can't find the MOSFETs online in minimum quantities less than 30. I might go for a different one if I continue to have no luck.

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