Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

> 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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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/

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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,

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

Re: [time-nuts] ULN regulator with more current capability than LT3042?

- Original Message - From: "John Ackermann N8UR" <j...@febo.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Sunday, March 18, 2018 4:13 PM Subject: [time-nuts] ULN regulator with more current ca

Re: [time-nuts] ULN regulator with more current capability than LT3042?

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

[time-nuts] ULN regulator with more current capability than LT3042?

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