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Old 3rd May 2012, 11:50 AM   #1111
AndrewT is offline AndrewT  Scotland
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Today 12C sunny day. Only a few wisps of cloud.
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Old 3rd May 2012, 12:32 PM   #1112
vgeorge is offline vgeorge  Greece
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I don' t know the exact temperature here in Poros, but I am just going for a swim - as I ' ve been doing the last few days!
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Old 3rd May 2012, 12:44 PM   #1113
massimo is offline massimo  Italy
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I don' t know the exact temperature here in Poros....
27 according to meteo.gr
I'm just a bit envious....
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Old 3rd May 2012, 02:04 PM   #1114
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Just now sunny day 21 in Blanes.

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Old 4th May 2012, 03:04 PM   #1115
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5deg c. in Oslo today,
Forecast says snow the next days

Greece is my solution for winter depression
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Old 4th May 2012, 07:10 PM   #1116
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Default BiB reg unhappy?

I have built a number of these regs and everything has worked quite well until now.
I am trying to power a SOtM USB output card in my music server with a BiB reg. Using the electrolytic output cap option (47 uF Silimic 2), this a 12 volt device. I have plenty of current available, and everything works, but the reg has over 100 mV AC on its output, but it woks fine on a resistive dummy load. The real load does have quite a bit of C at its input (I see >2500 uF or so), could this capacitance be causing the problem? Should I try adding a 1R at R307, or...?
Thanks for any help guys.
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Old 4th May 2012, 07:59 PM   #1117
Salas is online now Salas  Greece
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Its oscillation you got on output due to large phase shift with a combination of components on that load that work against best system stability with BIB. Or even partial interference. Use another 47u soldered with short legs directly across S+/S0 BIB take off side. If that ain't enough to make AC mV unreadable, additionally buffer the load with 1R in series on its own board +V point. Move the now receiving node's F+/S+ incoming connections on the buffer resistor's free leg.
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Old 4th May 2012, 08:05 PM   #1118
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Default Thanks,

Salas, I will give that a try.
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Old 4th May 2012, 11:44 PM   #1119
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Quote:
Originally Posted by Salas View Post
Its oscillation you got on output due to large phase shift with a combination of components on that load that work against best system stability with BIB. Or even partial interference. Use another 47u soldered with short legs directly across S+/S0 BIB take off side. If that ain't enough to make AC mV unreadable, additionally buffer the load with 1R in series on its own board +V point. Move the now receiving node's F+/S+ incoming connections on the buffer resistor's free leg.
Salas, you were right on. I added another 47 uF cap directly across the sense outputs, and the reg now appears to be entirely stable (mV AC below the limits of my meter).
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Old 5th May 2012, 12:00 AM   #1120
Salas is online now Salas  Greece
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