Xilinx Boards and Kits

[diego73]

Hello!

A few days ago I'm working on a simple embedded system with MicroBlaze. All goes well the first 10 minutes, then the voltage regulators and the FPGA will become very hot.
My question is, is there a specific Fansink for this kit (SP605) and where I can get it?.
I searched on Radian heatsinks, but they say the BGA is quite small.

Regards

Diego H.

[austin]

Diego,

What is "quite hot?"

As long as the die (junction) temperature is below 85C, you are OK (in specification).

Note that in still air the thermal die to case increase in temperature may be as much as 7 to 10 degrees C per watt.

What power is estimated for your design by XPA in the tools? What die temp is predicted?

[diego73]

Junction temperature : 35.4 °C.

Total on chip power: 0.543W.

Thermal margin : 49.6 °C, 2.5W.

But the FPGA exceeds this temperature to about 60 ° C,  measured with laboratory instrumentation.

[austin]

Diego,

'First, you should find out why you are drawing so much current.

Is it IO?  Is it the core?

Do you have the right clock frequency in the estimate?

[diego73]

Yes, i have the 200MHz clock in the estimate, and I only use the UART, no ethernet, no system ACE, not FMC.

This also happens with the examples I have downloaded from the Xilinx web site, so I do not think it's a bad design made by me.

I think it's important to note that while the FPGA is not configured, the temperature is normal (less than 10°C), but the voltage regulator heat up after about 10 minutes.

[austin]

OK, so the case temperature is 85C or so?  That is very bad, as the die is perhaps 40C hotter.

You need some serious airflow, or heatsinking.

Yes.

[diego73]

Yes, I really need a fansink. The problem is I can not find any who could use in my SP605, most are very large and do not correspond to the size of the FPGA.

[pmartos]

Hi,

I also had this problem with the Atlys and XUP-V5 boards, so I added a heatsink and fan:

I use this heatsink:

http://uk.rs-online.com/web/p/heat-sinks/0104036/?searchTerm=0104036&relevancy-data=636F3D3126696E3D...

It's the RS components Code 104036

With this fan:

http://uk.rs-online.com/web/p/axial-fans/0191856/?searchTerm=0191856&relevancy-data=636F3D3126696E3D...

It's the RS components Code 191856

HTH,

best regards,

Pedro

[diego73]

Thanks pmartos, I'll search for something closer to Mexico because I need the material as soon as possible.

Thank you.