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June 1999

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Subject:
From:
Ian Boyton <[log in to unmask]>
Reply To:
"TechNet E-Mail Forum." <[log in to unmask]>, Ian Boyton" <[log in to unmask]>
Date:
Thu, 10 Jun 1999 02:25:44 PDT
Content-Type:
text/plain
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text/plain (55 lines)
I sent this a couple of weeks ago and had no responses, so after the
previous few days of technet I thought I'd try again.

Hi Technetters

Has anyone experienced any failures of TL783 series voltage regulators
manufactured by Texas Instruments?  I have come across a number of devices
that have shut down unexpectedly.  Failure analysis has indicated a higher
than normal contact resistance within one area of the internal circuit that
causes the spurious shutdown to occur.  Once shut down, devices will remain
in this condition indefinitely, whether powered or not, at least until the
junction temperature is raised above 60-70F for a period of time. i.e.
failure occurs when the temperature drops. After recovery, the devices
appear to function correctly and do not shut down if the temperature is
reduced again.

I have found it possible to keep failures in the "failed state" but only
with the use of cold conditions!!!

NB Failures do occurabove the minimum specified operating temperature of the
device.

Any information on similar failures would be appreciated.

Regards

Ian Boyton


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