Electronics > Projects, Designs, and Technical Stuff
DC load using a CPU cooler
microbug:
Yes, it's the A30. I'll probably have two TO-247 packages under it (the linear-optimised MOSFETs from the previous post are available in TO-247 and I think two TO-247s will be better than 3 TO-220s. Thanks timb!
Spikee:
I have soldered the initial prototype but i soon found out there is a short somewhere on the board.
I was unable to locate the problem :-\ . I have started populating a second board and assembling and testing between each step to find the culprit. The power segment seems to function without any issues.
Edit:
This one IXTH75N10L2
http://ixdev.ixys.com/DataSheet/DS100200(IXTH-TT75N10L2).pdf
timb:
Micro, what sort of driver are you looking at?
Edit: I mean OpAmps to drive the MOSFETs. Sorry, have been working on a SMPS tonight and have MOSFETs drivers on the brain!
Sent from my Smartphone
microbug:
Tim, it's an OPA4188 in a typical constant current configuration (100mOhm sense resistor). The current implementation is based on this thread, but I will probably change it to a more 'standard' configuration (input to the non-inverting terminal, shunt voltage to inverting) to make it easier to do a hardware constant voltage mode. I'm working on the schematic at the moment and I'll post a screenshot of the power stage soon.
Thanks for pointing out the right FET, Spikee. That one looks like it could (in theory) do 300W at the right current on its own, but I'll use two of them in the design (separate op-amp for each) to account for all the graphs other than the SOA in the datasheet that I didn't bother to read ;) . I'll send an email to IXYS to ask for 3 (in case I blow one) and post the result.
EDIT: Spikee, that FET looks 100V rated to me ;)
EDIT 2: Uh Oh! I just looked up stock of IXTH75N10L2 on Octopart having just sent a grovelling email to the IXYS sales rep office in the UK, and it turns out neither Mouser nor Digikey have the part in stock (it's a 'factory direct' part)! I hope that IXYS has some internal stock or something... I suppose it wouldn't be too hard to find another suitable MOSFET.
Spikee:
IXYS has it and will send you a few free because it is not in stock at their distributors.
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