The simplistic Salas low voltage shunt regulator - Page 603 - diyAudio
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Old 14th May 2013, 10:06 PM   #6021
tassosk is offline tassosk  Greece
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Impatient as I am, changed all non passive components starting from Q303 to the output.
I gave a try with the dummy load and worked fine. Connecting the regulator to the load, to my surprise, same situation as before.
And the culprit was a loose connection from the regulator ground to the DAC :-(
Very robust design I must say.
Works fine now, thanks for the hint.

Last edited by tassosk; 14th May 2013 at 10:10 PM.
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Old 14th May 2013, 10:18 PM   #6022
Salas is offline Salas  Greece
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Its frequent we get fooled when troubleshooting electronics, there are so many factors. Its OK since the system went up again soon.
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Old 15th May 2013, 08:53 AM   #6023
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Quote:
Originally Posted by Salas View Post
Hi Kazuo

Better set the probe at 1X and turn the Tek TDS scope's 20MHZ bandwidth limit "ON".
Thanks for advice
Since I am experimenting on some MOSFETs for M3, I will take photos after finished again.
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Old 15th May 2013, 10:54 AM   #6024
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Default Reflektor Advanced

Quote:
Originally Posted by canvas View Post
Kazuo san,


I'm glad you've improved the reflektor. I am planning to try the new version. However, I don't have STP55NF06L at hand. Can I still use MTP3055VL as M3?
Hi, Canvas
I have to apologize to you.
On post #5934 I said that MTP3055VL was not suitable for M3.
However, I thought that this opinion was on no grounds and must be tested.
As result, MTP3055VL shows better performance than STP55NF06L,feeling more liveliness. I guess this reason is its lower Cxxx.
Yes, I recommend MTP3055VL.
I thank you for letting me noticed

Attached are latest schematics, more simple circuit than previous.
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File Type: png Reflektor Advanced +3.0V(22th).png (29.0 KB, 535 views)
File Type: png Reflektor Advanced +4.7V(8th).png (29.1 KB, 477 views)
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Old 16th May 2013, 07:35 AM   #6025
canvas is offline canvas  Taiwan
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Kazuo san,

Great to hear that! I am going to try it tonight. Thanks!
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Old 21st May 2013, 08:07 AM   #6026
Ceglar is offline Ceglar  Australia
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Default Quick question regarding Current Set resistor for SSLV reg.

Hi,

I've got a 'SSLV' board here from dvb-projekt to use as a 5V supply for a load that draws 500mA.

The BOM that came with the board specifies (R1) as 10ohms and has 'Adj Current ~200mA'.

From what I've read in this thread, R1 to set current should be 0.6/current required. Where current required equals load current plus ~200mA for the shunt.

I calculate therefore 0.6/0.7 = 0.85 ohm (or closest value), in a package that can accommodate (0.7x0.7)x0.85 = ~0.5W. (3W+)

I have seen a few different schematics around which may or may not make a different, I have attached the circuit that I am using, current set resistor is to the left 'R1', I'm not using 3v3 output but its the only schem. that I have.

If someone could varify that my calculations are correct (and perhaps also that the shunt is OK with 700mA in the event that the regulator is unloaded), that would be very much appreciated..

Thank you,
Shane
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Old 21st May 2013, 08:20 AM   #6027
AndrewT is offline AndrewT  Scotland
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Tack in a temporary 10r for the current setting resistor.
Measure the voltage across it and from that determine the CCS current.
*** more 10r for extra CCS current.
Each time you add an extra "R" the voltage will drop very slightly. Recalculate the CCS current.
When you get to close to what you require power down and replace the group of 10r with an equivalent single resistor, or leave the group of 10r soldered in permanently.
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Old 21st May 2013, 08:35 AM   #6028
Ceglar is offline Ceglar  Australia
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Thanks Andrew, is there an amount of current that the shunt requires before it functions correctly?. If the circuit does comply with R1 = 0.6/Current required, 60mA isnt alot for a cct that I hope will be ok with 700mA through the shunt itself in the event of the supply being unloaded.
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Old 21st May 2013, 09:45 AM   #6029
AndrewT is offline AndrewT  Scotland
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insert the 10r and measure the voltage drop your assembly actually has.
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Old 21st May 2013, 09:46 AM   #6030
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by AndrewT View Post
Tack in a temporary 10r for the current setting resistor.
Measure the voltage across it and from that determine the CCS current.
*** more 10r for extra CCS current.
Each time you add an extra "R" the voltage will drop very slightly. Recalculate the CCS current.
When you get to close to what you require power down and replace the group of 10r with an equivalent single resistor, or leave the group of 10r soldered in permanently.
Measure the voltage across it and from that determine the CCS current.
Add more 10r for extra CCS current.

The blotted out word is "add". What's wrong with that@?
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