Before adding complexity of parallel devices or external passing, why
not just try the old parallel-resistor trick? If the load takes a
certain minimum current under all conditions, provide less than that via
a resistor from the raw source to the regulated output, likewise under
all conditions.
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of John
> Ackermann N8UR
>
> Reviving the conversation about superb voltage regulators, I am looking
> for one to run the analog and PLL bits of a high performance frequency
> synthesizer chip.
>
> The current drain looks to be about
Am 20.03.2018 um 10:09 schrieb Attila Kinali:
Hoi Gerhard,
On Sun, 18 Mar 2018 21:41:28 +0100
Gerhard Hoffmann wrote:
Use the LT3042 with an external power transistor, such as D44VH10G:
<
https://www.flickr.com/photos/137684711@N07/29197476530/in/album-72157662535945536/
>
Performance i
Hoi Gerhard,
On Sun, 18 Mar 2018 21:41:28 +0100
Gerhard Hoffmann wrote:
> Use the LT3042 with an external power transistor, such as D44VH10G:
>
> <
> https://www.flickr.com/photos/137684711@N07/29197476530/in/album-72157662535945536/
>
> >
>
> Performance is about the same as the LT3042 al
I have a quad LT3042 board somewhere.
I should get around to measuring its output noise.
Bruce
> On 20 March 2018 at 03:11 John Ackermann N8UR wrote:
>
>
> Thanks, all. I think I'll end up using the 3042 with pass transistor,
> partly for reasons of cost. I have no idea whether paralleling
The details are on the LT3042 datasheet.
A small series ballast resistor is used in series with each output and the Iref
terminals are connected in parallel so only the offset of the unity gain output
buffer is of significance.
Bruce
>
> On 20 March 2018 at 02:23 Peter Vince wrote:
>
>
Thanks, all. I think I'll end up using the 3042 with pass transistor,
partly for reasons of cost. I have no idea whether paralleling two
3042s would result in lower noise from the device, and there are already
three or four fairly pricey chips on the board.
I appreciate all the info!
John
-
Please forgive this naive question, but I am concerned about the idea of
simply running two regulators in parallel. Just like you don't put two
batteries in parallel, how do you ensure accurate load balancing between
the two? I would worry that one of them, with a fractionally higher
voltage, wou
Tom wrote:
Run two in parallel for twice the current and less noise?
This is actually a better solution than using an LT3045, for two
reasons. First, as Tom noted, by paralleling two devices, the noise is
reduced by sqrt 2 = ~1.4:
"Designed as a precision current reference followed by a h
Hi
Getting the heat off of the regulator package may have other benefits ( like
improved
stability). A lot depends on just where the heat goes in each case …..
Bob
> On Mar 18, 2018, at 4:41 PM, Gerhard Hoffmann wrote:
>
>
>
> Am 18.03.2018 um 21:13 schrieb John Ackermann N8UR:
>> Reviving
Am 18.03.2018 um 21:13 schrieb John Ackermann N8UR:
Reviving the conversation about superb voltage regulators, I am
looking for one to run the analog and PLL bits of a high performance
frequency synthesizer chip.
The current drain looks to be about 160-180 mA at 1.8 V, which is
uncomfortabl
Thanks, Bruce!!!
On 03/18/2018 04:19 PM, Bruce Griffiths wrote:
Use an LT3045, its the 0.5A version of the LT3042.
Bruce
On 19 March 2018 at 09:13 John Ackermann N8UR wrote:
Reviving the conversation about superb voltage regulators, I am looking
for one to run the analog and PLL bits of a h
- Original Message -
From: "John Ackermann N8UR"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, March 18, 2018 4:13 PM
Subject: [time-nuts] ULN regulator with more current capability than LT3042?
Reviving the conversation about super
Use an LT3045, its the 0.5A version of the LT3042.
Bruce
> On 19 March 2018 at 09:13 John Ackermann N8UR wrote:
>
>
> Reviving the conversation about superb voltage regulators, I am looking
> for one to run the analog and PLL bits of a high performance frequency
> synthesizer chip.
>
> The c
Reviving the conversation about superb voltage regulators, I am looking
for one to run the analog and PLL bits of a high performance frequency
synthesizer chip.
The current drain looks to be about 160-180 mA at 1.8 V, which is
uncomfortably close to the limit for the LT3042 (200 mA). The
man
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