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Old 13th July 2020, 10:53 PM   #361
phile1 is offline phile1  France
diyAudio Member
 
Join Date: Nov 2015
hi
just a noob question. I need to reach some low voltages, 3.3V & 1.8VDC.
what's the best way to feed a SLS module :
- your transformer 4.2VAC => to a SLS AC version (given that after rectification you have 5.1VDC to feed the LT3045)
- or a rather good LPS like a zerozone, 5VDC output => to a SLS DC version
thanks for advice
Rgds
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Old 14th July 2020, 04:12 PM   #362
phile1 is offline phile1  France
diyAudio Member
 
Join Date: Nov 2015
Hi Micheal,,
I've got a 2nd question :
As the datasheet mentions & you too, when we have 1 LT3045, we roughly need Vout-Vin=1V to get a decent ripple noise rejection.

The SLS has 2 rows of LT3045, thus a design with 2 LT3045 in series, so :
- on the PCB, do we have 1V diff beteween the 2 rows of LT3045 ? I think "yes" given the datasheet
- and so, could you please confirm that with the "special" PS, we need 2V diff between in & out, and not 1V like for the other PS you manufacture ?
thanks for reply
Rgds
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Old 14th July 2020, 09:28 PM   #363
Stammheim is offline Stammheim  Germany
diyAudio Member
 
Join Date: Jul 2012
Hi phile1,

the recommendation of the power source depends on your current need. In case of 2A for example and 1,8VDC output voltage that would mean 6,4W of heat - we recommend <4W max (less is better) in sum for passive cooled setups.

Usually we adjust the first stage to +0,8V additional voltage. As shown in the datasheet the Vdifference depends on the current need, for low currents a higher Vdifference can be set, lower for higher current. We recommend to set the Vdifference below +0,5VDC.

We have also published some measurements as well, which transformer voltage is needed to reach a certain V/A. Visit our FAQ

If you have any questions, feel free to contact us via our website.

I'm not sure what you mean with the special PS?

Best regards

Michael | MPAudio
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www.MPAudio.net
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