C-multiplier again
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From: John Larkin on 27 May 2010 14:22 On Thu, 27 May 2010 17:55:24 GMT, Mike <spam(a)me.not> wrote: >Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: > >> DN3525 6 ohms at 0V, but your fault current is going to be something >> like an ampere... > >Actually that's an interesting part. 250V, 300mA, TO-243, -1.5V pinchoff. > >http://www.supertex.com/pdf/datasheets/DN3525.pdf > >I'll put that in my reference folder. > >Thanks, > >Mike > SSRs make interesting overload limiters too, especially if you can turn them off in a reasonable amount of time after an overload, or during powerup transients. I'm using a Clairex part for that just now, 4 ohms typ. John
From: Mike on 27 May 2010 14:32 George Herold <gherold(a)teachspin.com> wrote: > OK this is still a sim. However I spiced the C-multiplier (aka Hobbs > filter at teachspin) I use to get down to ~1nV. I haven't every > bumped into the Early effect (I don't do much on the transistor > level.) But this shows attenuation down near 90dB at 100kHz. (Which > is where the switcher I use lives.) [...] Seems to be missing some components. I got the 2N4401 and what appears to be a AC source in series with 15V. Everything else is just gaps. I browsed the file but could not find any references. > George H. > Oh, and thanks again Mike for showing me how to post and read the > LTspice stuff... I feel so empowered. You are welcome. Mike
From: Mike on 27 May 2010 14:35 John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > SSRs make interesting overload limiters too, especially if you can > turn them off in a reasonable amount of time after an overload, or > during powerup transients. > > I'm using a Clairex part for that just now, 4 ohms typ. > > John I'm not sure how that relates to protecting the inputs of the AD797. Mike
From: Mike on 27 May 2010 14:53 OK, I see the problem. Maybe the file is missing a portion near the end. Can you copy the original to an empty folder and zip it, then post the zip to abse? Thanks, Mike
From: John Larkin on 27 May 2010 15:05
On Thu, 27 May 2010 18:35:43 GMT, Mike <spam(a)me.not> wrote: >John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >> SSRs make interesting overload limiters too, especially if you can >> turn them off in a reasonable amount of time after an overload, or >> during powerup transients. >> >> I'm using a Clairex part for that just now, 4 ohms typ. >> >> John > >I'm not sure how that relates to protecting the inputs of the AD797. > This is a discussion group. It doesn't. But come to think of it, an SSR could be a 4-ohm replacement for the 50 ohm thing, with correspondingly less Johnson noise. John |