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Also, with a 20% tolerance part, good practice requires answering
the question "how will this operate if (each, some, all) caps are at
-20%, 0%, +20%?). So the 22uF cap might be a 18uF cap before the DC
bias correction is applied. I also agree with the forum woman's
suggestion to consider higher voltage parts. And a single 1206 or
1210 would beat a pair of 0805s for both convenience and simplicity,
wouldn't it? <br>
<br>
This is all absolutely fabulous, and potentially useful to
interested folks on the list who want to see these kinds of chips
actually deliver their spec'd performance reliably. But can it
explain the terrible state your system gets into such that it does
not respond to reset? Are these changes to stray capacitance,
ripple, thermal performance, etc going to prevent the state in which
the Atmega is not restarting until the entire system is power
cycled? Does this TI chip have any unstable states that could
account for the symptoms you've reported? <br>
<br>
-Pete<br>
PS Had to trim this down to stay under the per-message limit. It's
also very hard on folks reading this stuff on their phones to have
to wade across fractional megabytes of redundancy. Everthing is in
the archive (link at the bottom of every message).<br>
<br>
<br>
<div class="moz-cite-prefix">On 01/25/2017 09:04 AM, Chip McClelland
via TriEmbed wrote:<br>
</div>
Jesse,
<div class=""><br class="">
</div>
<div class="">You were right on with the thermals comment. <a
moz-do-not-send="true"
href="https://e2e.ti.com/support/power_management/non-isolated_dcdc/f/196/p/569106/2089407#2089407"
class="">Here</a> is that discussion thread with the progression
of the design. </div>
<br>
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