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Old 26th February 2018, 09:16 AM   #4141
wolp is offline wolp  Italy
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Hi Salas, thank you for your excellent regulator.
What is the lowest CCS recommended for this design?

Can you cascade 2 regulators. For example, I require both +35V and +15V. Could you feed the output of the +35V to a circuit as well as a +15V salas regulator (probably via a small voltage dropping resistor) to feed a different part of the circuit that requires 15V?

I don't wish to use more than transformer or use an expensive custom transformer with different taps.

Any help here is very much appreciated.
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Old 26th February 2018, 01:50 PM   #4142
Salas is offline Salas  Greece
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Lowest CCS +50mA over the load's peak current demand. But it can work down to the CC limit before the output voltage drops.
Better +100mA. Hot-Rod +200mA.

Theoretically they could be cascaded but personally I haven't used two units in that way to can tell you if there could be any odd side effects like oscillations. Just arrange them like that and check if their outputs behave well before deciding to install them.
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Old 27th February 2018, 06:48 AM   #4143
wolp is offline wolp  Italy
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Thanks again Salas for your speedy reply. When you say " Better +100mA. Hot-Rod +200mA" what are you meaning? Better regulation, lower output impedance, lower noise etc?
If I do find an oscillation, can a capacitor be use to remove the oscillation and where would I place it in the circuit? Also is it possible to still buy 2SK117?
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Old 27th February 2018, 12:13 PM   #4144
Salas is offline Salas  Greece
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Lower output impedance & lower intermodulation distortion on the rails when with a strongly varying load.

Put the extra cap at the load or at the output connector. But first try two wire mode. You can alternatively buy surface mount 2SK880-GR and use SOT23 to DIP adapter mini boards so to try keep away from 2SK117 Ebay fakes. 2SK880 Toshiba JFET | Mouser
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Old 28th February 2018, 09:20 AM   #4145
wolp is offline wolp  Italy
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One last query Salas. For a well behaved regulator, what figure of noise voltage RMS should I expect to measure? Thanks for the mouser link.
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Old 28th February 2018, 02:20 PM   #4146
Salas is offline Salas  Greece
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Not easy to reliably measure a PSU's noise out of the common mode and RF noise that creep in a bench setup. It takes high price differential analyzer lab gear. When at 5mV/div on the scope, even lower if it can, from power off PSU to power on PSU the line's noise on the screen should barely change if at all from what random noise baseline the whole test loop with leads and the scope itself can achieve best. Set the horizontal to somewhat fast enough sweep time like 50uS. No distinct AC waveform must appear (high frequency oscillation) just a straight line with the least amount of hash you can manage in your bench test.
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Old 28th February 2018, 03:39 PM   #4147
Salas is offline Salas  Greece
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Luckily Jack Walton (member JackinNJ here) had done well organized extensive tests on several PSU designs using his Audio Precision station. Some of those including the SSLV1.1 were part of an article in Linear Audio Vol. 4 and they used to be accessible as pictures.
I can still find only a couple of those charts in our forum to link. The nV/RtHz Y axis indicator wasn't there on the original second chart as far as I can remember. 10-6 should be 1uV/rtHz and 10-9 should be 1nVrt/Hz I believe. See about square root Hz noise: datasheet - Noise and what does V/√Hz actually mean? - Electrical Engineering Stack Exchange
There was an output impedance chart also that verified my simulation's prediction surprisingly well. But I can't find a link for it anymore.

Click the image to open in full size. Click the image to open in full size.
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Old 2nd March 2018, 11:59 AM   #4148
Johnny Canuck is online now Johnny Canuck  Canada
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I was looking at these graphs just the other day - here is the link to them on the Linear audio website:
Downloads | Linear Audio

Many thanks to Mssrs. Walton and Didden for making the data available.
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Old 3rd March 2018, 12:25 AM   #4149
Salas is offline Salas  Greece
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Yep those are the ones, thanks a lot.

Additionally I found in my archives an older, for the BiB only, Zo graph that Jack once posted in the simplistic low voltage regulators thread.
Also here's my simulated Zo graph when the regulator's settings should have been the same as in his test. Resulting in same spare current.

Practically very close results. Except for one detail. The predicted curve has a quicker supersonic rise to 16mΩ 100kHz while Jack's measured curve has a slower rise to 8mΩ 100kHz. Spice models can sometimes be little pessimistic for intrinsic capacitance of some actual production parts to our benefit it seems
Attached Images
File Type: gif Z_1_1_Jack_settings.gif (18.0 KB, 262 views)
File Type: png ZoSim1v1.png (6.8 KB, 263 views)
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Old 5th March 2018, 07:31 PM   #4150
bern is offline bern  Poland
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Hi,
I would like to use SSLV as a power supply to my BeagleBoneBlack board (BBB) 5V DC.
The challenge is charging process of the BBB battery. During normal work BBB consume about 0,4A but during charging max current usage is about 1,2A.
Max current consumption is during boot and charging for a first 5-10minutes. After that is gradually drop to typical 0,4A.
I thought that I could try SSLV. I need fix it at CCS= 1,5A.
Please advise which parts to use that regulator could withstand 5V DC and 1,5A load.
Could I use C104=10uF/400V foil capacitor?(A capacitor that has remained unused from another project). What capacitor do you recommend in the C102 position for Vout=5V DC/1.5A?
Thanks in advance,
Bern
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