Quote from: butjust41day on June 22, 2014, 09:28:09 PM

Quote from: s1gs3gv on June 21, 2014, 05:46:12 PM

Here is a datasheet for a typical remote diode temperature management/fan control IC.

http://www.ti.com/lit/ds/symlink/lm96063.pdf

Note: "The LM96063 is remote diode temperature sensors with integrated fan control that includes remote diode sensing. The LM96063 accurately measures: (1) its own temperature and (2) the temperature of a diode- connected transistor, such as a 2N3904, or a thermal diode commonly found on Computer Processors, Graphics Processor Units (GPU) and other ASIC's."

These type of devices typically integrate with an on die thermal diode.

On the issue of BRM46x thermal design constraints, the spec says 125 C. Not 100 C, not 105 C. Looking at the data sheet, it looks like the device temperature is reported via the PMBus and may also be subject to configuration via a configuration file:

"This product is designed with a digital control circuit. The control circuit uses a configuration file which determines the functionality and performance of the product. The Electrical Specification table shows parameter values of functionality and performance with the default configuration file, unless otherwise specified. The default configuration file is designed to fit most application needs with focus on high efficiency. If different characteristics are required it is possible to change the configuration file to optimize certain performance characteristics. Note that current sharing operation requires changed configuration file. See application notes AN307 for further information."

Is anyone having problems with Neptune's shutting down due to thermal issues or is this yet more FUD being spread by haters and envious ne'er do wells towards KNC ?

Thanks for the information on the LM96063 and pointing out facts throughout this thread. I work with equipment where I can measure temperatures 100s of yards away so I don't understand why anyone would thing a small IC on the side of a board is not capable of reading temperatures directly inside an ASIC several inches away. The more I investigate and sift through the postings of people who don't really know the more comfortable I am feeling with the Neptune.

I have no doubt that a better heat sinking arrangement for the VRMs is in the works or could be made. At the least it's an easy thing to modify and I'll get my 12 year old (because of smaller fingers and better eyes) to take care of it for me. Based on the specs I would like to see temperatures maintained below 100 and preferably 80 to 90 degrees C on the hottest VRM.

Yes: I'm already working on this. Many things can be improved.