Re: Something for Joerg, maybe

On Sun, 12 Oct 2008 18:55:22 -0700, John Larkin
<jjSNIPlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Sun, 12 Oct 2008 17:32:44 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> wrote:


On Sun, 12 Oct 2008 17:15:59 -0700, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

Jim Thompson wrote:
On Sun, 12 Oct 2008 16:21:48 -0700, John Larkin
<jjSNIPlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Sun, 12 Oct 2008 15:10:17 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> wrote:

On Sun, 12 Oct 2008 14:18:35 -0700, John Larkin
<jjSNIPlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Sun, 12 Oct 2008 13:55:25 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> wrote:

On Sun, 12 Oct 2008 16:33:29 -0400, Phil Hobbs
<pcdhSpamMeSenseless@xxxxxxxxxxxxxxxxxx> wrote:

Martin Griffith wrote:
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1040,C1055,P86471

martin
Wow, that 'typical application' internal schematic is a new low for LTC.
What is it, germanium?

Cheers,

Phil Hobbs
Naaaaaah! Those of us skilled in the art of electronics (the real
stuff, not the book) see a unity gain CMOS buffer with reference
generated by a BandGap controlled current ;-)

...Jim Thompson

You don't believe the NPN output transistor symbol?

John

Can't make the claimed head-room that way ;-)

...Jim Thompson

It can if you pull the base high enough. Which they do.

John

My bad! Didn't read close enough. You _could_ use a charge pump to
accomplish such a task.


Ask CA politicians, they'll tell you how to do it without. Well, at
least up to now :-(

Charge pumps are so easy to do... I've even utilized them in hearing
aids (for the MEMS microphone) and hot-plug circuits.. Could give you
LDO without the stability issues, though I'm not sure how well they
could respond to transient loads.

...Jim Thompson


We recently "invented" the flying-capacitor "isolated" DC power
supply, using 300 volt SSRs in a DPDT configuration. They switch slow
enough that the spike situation should be pretty good, compared to
most dc/dc converters. And no transformers!

Have you seen Jim Williams AN-70 "A Monolithic Switching Regulator
with 100uV Output Noise"? He also trades switching speed (and a bit
of efficiency) for low noise.

It's about time for somebody to make a small laser/pv package as a
very quiet isolated power supply.

John
.

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