Darrell Harmon19h ago

I've not really pushed the buffer board at all, have not had a heatsink on it until today. Xilinx XCKU5P docs specify a 52 amp maximum for VCCINT with the FFVB676 package. I'm taking that as a challenge, this board is capable of 80 A.

A bunch of my AES cores to use up the LUTs and FFs, my cosine cores to use the DSPs and BRAMs will do a good job of loading all of the resources for power testing. I'll be doing load step in addition to maximum power testing.

Show threadAaron Holtzman
@dlharmon did you try step testing it at 80 amps? The Oxide folks did a podcast where they talked about testing a supply for a giant switch asic. The big car battery cables they used would twitch every time it stepped.
3:13amWeb
Show threadDarrell Harmon5h ago
@aholtzma My load was a length of 12 AWG bare copper wire. Didn't do any step testing there for lack of a switch. The power waster bitstream will serve the purpose for step testing and tuning the transient response of the supply.
Show threadAaron Holtzman2h ago
@dlharmon doing the step in the FPGA is a great idea. Would be good for manufacturing test too.