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ZedBoard Hardware Design 1V power rail burnt ...
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Related

1V power rail burnt ...

Former Member
Former Member over 13 years ago

Hi,


Within a few minutes of operation, the zedboard ceased to operate all together, no leds even come up anymore.

A bit of diagnostic shows that the 1V rails is no longer operating. Here's what it looks like : http://i.imgur.com/klrQhI6.png  (so roughly 400 mv, and not stable). It's not really consuming any current (barely 10 ma).

Did anyone ever see such a failure ?  And what could cause it ?  I don't see any physical damage on the board, nor any obvious burnt component.

Cheers,

    Sylvain

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  • Former Member
    0 Former Member over 13 years ago

    Sometimes ESD will cause this sort of damage.

    Nothing can be seen, but there is a giant destroyed crater inside a device,,,perhaps 100 u in diameter.

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  • Former Member
    0 Former Member over 13 years ago in reply to Former Member

    But what surprise me is that the board operated fine and it just stopped working while it was just sitting there, not being handled or anything.

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  • ctammann
    0 ctammann over 12 years ago

    We've recently gotten some reports from the field that some customers have seen their 1V supplies drawing upwards of 3A.  In all of our worst case calculations the highest current we expected to see based on the XPE tool was 1.3A.  We're investigating now on where this additional current draw is coming from.  Looking back at the issue you had with your system I wonder if perhaps you were also drawing higher current which could have caused the output inductor to saturate and damage something on the 1V rail.  Were you running your own build inside the device or did it fail without the Zynq device being loaded?
    Thanks
    Chris

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  • Former Member
    0 Former Member over 12 years ago

    It was pretty much running the ADI reference design for the zedboard HDMI output ...

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  • Former Member
    0 Former Member over 12 years ago

    Also, I actually now disconnected the 1V rail from the regulator and added an external 1V regulator and the board has been running fine since.

    http://i.imgur.com/9x9rlpk.jpg

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