Grey Jaguar No Power Out

[EricVanWyk]

Originally Posted by kamocat

80 watts IS a lot, isn't it?
I wonder why infineon claims each power transistor can dissipate 100 Watts?

That spec only accounts for the junction to case thermal resistance and assumes a perfect heatsink with infinite mass at 25C. Power MOSFET specs are actually pretty funny when you look into the assumptions made.



I'm still confused as to what is going on. How is this different than the ESD issue?

[kamocat]

Originally Posted by EricVanWyk

I'm still confused as to what is going on. How is this different than the ESD issue?

How is the "no power out" different from the ESD issue?
Did I miss something?

In order for ESD to be a problem, wouldn't the case have to be opened up. You're saying the case was opened up while the Jaguar was still functional? Why would someone do that?

Or is it something else entirely?

[Al Skierkiewicz]

Marshal,
The ESD issue didn't need the case to be open. During the 2009 game, the regolith especially in ice arenas produced some rather extensive static lightning strikes for robots and field. Some of these events punched through the case or traveled along the wiring and took out some components. The early Jags also had an issue with the FET gate drivers that would self destruct and usually caused a single direction failure.

[kamocat]

Originally Posted by Al Skierkiewicz

Marshal,
The ESD issue didn't need the case to be open. During the 2009 game, the regolith especially in ice arenas produced some rather extensive static lightning strikes for robots and field. Some of these events punched through the case or traveled along the wiring and took out some components. The early Jags also had an issue with the FET gate drivers that would self destruct and usually caused a single direction failure.

Does that mean I can return it for replacement?

[Joe Ross]

Originally Posted by kamocat

Does that mean I can return it for replacement?

I would recommend that you read the Jaguar Failure Analysis (FA) report, and then at least attempt an RMA. Both are linked from the luminary micro jaguar FRC site. Your Jaguar is probably out of warranty, but it doesn't hurt to try, and at least lets TI know the extent of the problems.