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Groups > sci.electronics.design > #431095
| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: LDO |
| Date | 2016-10-13 06:16 -0700 |
| Organization | Rowland Institute |
| Message-ID | <nto1f202oag@drn.newsguy.com> (permalink) |
| References | <54hrvblc24s5d7rj62noa4o2va6dl429c2@4ax.com> <hh61dd-sgh.ln1@baer-gmbh.com> <nto0m8$mjc$1@dont-email.me> |
piglet wrote...
>
>On 12/10/2016 08:49, Robert Loos wrote:
>> I love simulations. What would make me a little bit nervous is the small
>> oscillation at ~235kHz.
>> Doubling the output C silences it but I tried to add small C's here and
>> there and it only got worse. Not even the frequency changes notably.
>> So I wonder what determines the frequency? The rise time of the OpAmp?
>> A better idea how to silence it anyone?
>
> As posted the circuit is fine just the gain is too high, reduce R5
> (my guess is 10k?) and it should be OK.
Still overshoots at turnon. Added 1nF fixes.
--
Thanks,
- Win
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LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-11 22:09 -0700
Re: LDO Robert Loos <1209@baer-gmbh.com> - 2016-10-12 09:49 +0200
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-12 08:31 -0700
Re: LDO bitrex <bitrex@de.lete.earthlink.net> - 2016-10-12 22:47 -0400
Re: LDO John S <Sophi.2@invalid.org> - 2016-10-13 06:16 -0500
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 08:08 -0700
Re: LDO Klaus Kragelund <klauskvik@hotmail.com> - 2016-10-13 08:57 -0700
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 09:05 -0700
Re: LDO Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-10-13 09:26 -0700
Re: LDO Klaus Kragelund <klauskvik@hotmail.com> - 2016-10-14 04:38 -0700
Re: LDO Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-10-14 07:42 -0700
Re: LDO klaus.kragelund@gmail.com - 2016-10-12 14:35 -0700
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-12 15:58 -0700
Re: LDO Robert Loos <1209@baer-gmbh.com> - 2016-10-13 08:46 +0200
Re: LDO Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-10-12 15:08 -0700
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-12 15:53 -0700
Re: LDO Winfield Hill <hill@rowland.harvard.edu> - 2016-10-13 03:28 -0700
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 08:21 -0700
Re: LDO piglet <erichpwagner@hotmail.com> - 2016-10-13 14:03 +0100
Re: LDO Winfield Hill <hill@rowland.harvard.edu> - 2016-10-13 06:16 -0700
Re: LDO piglet <erichpwagner@hotmail.com> - 2016-10-13 14:30 +0100
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 08:26 -0700
Re: LDO doggerel <doggerel@nil.com> - 2016-10-12 16:07 +0800
Re: LDO Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-10-12 15:53 +0300
Re: LDO doggerel <doggerel@nil.com> - 2016-10-13 10:16 +0800
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-12 07:35 -0700
Re: LDO doggerel <doggerel@nil.com> - 2016-10-13 10:15 +0800
Re: LDO bloggs.fredbloggs.fred@gmail.com - 2016-10-12 08:41 -0700
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-12 09:20 -0700
Re: LDO bloggs.fredbloggs.fred@gmail.com - 2016-10-13 15:52 -0700
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 16:11 -0700
Re: LDO bloggs.fredbloggs.fred@gmail.com - 2016-10-13 21:45 -0700
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-14 09:05 -0700
Re: LDO Tim Wescott <tim@seemywebsite.really> - 2016-10-12 11:21 -0500
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-12 09:57 -0700
Re: LDO Tim Wescott <tim@seemywebsite.really> - 2016-10-12 15:11 -0500
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-12 16:11 -0700
Re: LDO Winfield Hill <hill@rowland.harvard.edu> - 2016-10-13 04:52 -0700
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 08:33 -0700
Re: LDO Tim Wescott <seemywebsite@myfooter.really> - 2016-10-13 18:21 -0500
Re: LDO John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-13 20:15 -0700
Re: LDO Tim Wescott <seemywebsite@myfooter.really> - 2016-10-14 12:35 -0500
Re: LDO Tim Wescott <seemywebsite@myfooter.really> - 2016-10-13 18:24 -0500
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