RE: [Paparazzi-devel] Tiny13 3V3 Rail Problem (11 ohms)

[Roman Krashanitsa]

Matt, I had problems with L5973D some time ago. But that would affect also
5V, which you don't mention. I had to go over almost all components on the
bottom side and found in one case 2 blown caps, and in 2 other cases broken
L5973D-s.

Do you get stable 5V on yours?


Roman

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> rg] On Behalf Of Matthew Currie
> Sent: Sunday, October 14, 2007 6:12 PM
> To: Paparazzi Devel
> Subject: [Paparazzi-devel] Tiny13 3V3 Rail Problem (11 ohms)
> 
> Group,
> 
> 
>   I have a Tiny13 here which was operating happily during the 
> day and upon returning the next, it was not.  I was powering 
> it with ~ 17V inadvertently which may be relevant to the 
> problem.  The symptoms I observed were the 3V3 line coming on 
> briefly and then dropping out, pulsing about once per second 
> or so.  I removed the LM1117 regulator IC and now measure 11 
> ohms across the GND and 3V3 rail.  Before I begin tearing 
> components off I wanted to run this past others in case they 
> came across something similar.  I can't picture what would be 
> causing 11 ohms of conductance across the rail.  In summary, 
> it ran for almost 24 hours at a high voltage (17V) so if 
> something burnt up, this would explain it.
> 
> 
> Regards,
> Matthew Currie
> 
> 
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