Q&A - Recent Threads

Two stage +/-15V supply with LT4320 bridges

nmahncke — Tue, 18 Jan 2022 11:32:25 GMT

Is there any plans to support the below signal chain power?

(50Hz AC) -> (LT4320) -> (LT3081) -> (LT3045)
(50Hz AC) -> (LT4320) -> (LT3091) -> (LT3094)

Preferably with room for large bulk caps in all three stages

The reason is, it is a more or less bullet proof high PSRR setup useful for ultra low noise designs (such as audio) and LTspice is having a hard time simulating it. Justification for two linear regulators is that the first takes care of attenuating voltage ripple allowing it's input cap to be relatively low value to decrease current spikes and increase bridge conduction angle while at the same time ensuring LT3045/94 Vin max and tracking 3V above the output by stacking VSET on top of VOUT. Using a switcher as preregulator would mean a stiffer input and it's duty cycle would be modulated by rectified mains frequency which has increased risk of traveling where it shouldn't due to the higher switching frequency.

Will Configurator allow me to choose different connector hardware?

JRStaley — Mon, 22 Feb 2021 18:06:49 GMT

Can I choose different connector hardware or do I just order it myself if I want a complex configuration?

Why can't I use the dual boards for some designs?

JRStaley — Mon, 22 Feb 2021 18:01:55 GMT

It works for my +/-12 and +/-15 volt applications, but never seems to work for my +/-5V designs. Why?

Why is one switcher vs another chosen by Configurator?

JRStaley — Mon, 22 Feb 2021 17:57:25 GMT

How do I know that the software is picking the best part for my application? I'm used to an FAE picking them for me.

What are the best performing LDO's for low noise applications?

JRStaley — Mon, 22 Feb 2021 17:56:11 GMT

Is there a ranking of "highest to lowest" for low noise performance with the LDOs used in SCP?

How does configurator pick an LDO to use?

JRStaley — Mon, 22 Feb 2021 17:55:02 GMT

Is this done by current or by noise?

Why do I get a message that an LDO can be used for this design?

JRStaley — Mon, 22 Feb 2021 17:53:36 GMT

Sometimes, I get a message than an LDO can be used instead of a switcher, but it uses a switcher anyways. Why?

How do I choose an LDO in Configurator?

JRStaley — Mon, 22 Feb 2021 17:29:53 GMT

Are LDO's chosen based on current, or can I force an LDO to be used for an output?

How many outputs can Configurator design at once?

JRStaley — Mon, 22 Feb 2021 17:28:04 GMT

Can I design an unlimited number of rails in one design?

Why do the links in the PDF report take me to a search on analog.com?

JRStaley — Wed, 17 Feb 2021 20:00:28 GMT

Is there a reason why the links take me to a search for the board instead of the product page itself?

Why does each rail in a design have multiple parts listed?

JRStaley — Wed, 17 Feb 2021 19:41:47 GMT

Which one do I use for my design? There are several listed in the PDF report.

What is the difference between SCP Configurator and LTSpice?

JRStaley — Wed, 17 Feb 2021 19:39:24 GMT

Will the Configurator software simulate operation?

Does SCP Configurator automatically suggest a dual output board?

JRStaley — Wed, 17 Feb 2021 19:31:09 GMT

If I have a positive and a negative rail, will the Configurator notice that and suggest a dual board in the design?

What is the difference between LTPowerCAD and SCP Configurator?

JRStaley — Wed, 17 Feb 2021 19:28:39 GMT

When do I use this software vs using LTPowerCAD?

Can I configure a system the way I want using Configurator?

JRStaley — Wed, 17 Feb 2021 19:27:51 GMT

Will this software support intermediate bus architectures?

What designs can I make with SCP Configurator?

JRStaley — Wed, 17 Feb 2021 19:25:42 GMT

Will this software design any system or any power level I want?