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Old 15th January 2014, 09:07 AM   #1221
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What about this?
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File Type: asc Circlophone-MOS-CCS-BUF.asc (10.6 KB, 23 views)
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Old 15th January 2014, 10:11 AM   #1222
Elvee is offline Elvee  Belgium
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It was stable, but the phase margin was a bit short, in the region of 44°.

I have made some changes, and now it is well over 100°:
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Old 15th January 2014, 10:40 AM   #1223
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Quote:
Originally Posted by Elvee View Post
It was stable, but the phase margin was a bit short, in the region of 44°.

I have made some changes, and now it is well over 100°:
Thank you Elvee. Square wave has excessive overshoot issue with this one but I'm not sure that is it a bad indicator or not. I just added some pF parallel to fb resistor but it didn't help.

EDIT: Very low main compensation cap (C4) like ~10pF fixes it, but phase margin is in question again. Reducing R24 also helps.

Last edited by terranigma; 15th January 2014 at 11:05 AM.
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Old 23rd February 2014, 05:36 PM   #1224
tvrgeek is offline tvrgeek  United States
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Taking a look here for my education. The first thing I see is you manage not to turn off the outputs. Big first step!
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