Low noise symmetrical PSU TPS7A4701 and TPS7A3301 - Page 2 - diyAudio
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Old 22nd April 2014, 03:24 PM   #11
mravlca is online now mravlca  Slovenia
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To make this "sense pin" useful, then it would be better to use two TPS7A4701. If using sense only on positive line and no sense pin on negative, then the circuit wouldn't have any benefit with it, as negative side would be, I expect, noisier.

BR,
Ales

p.s. Hopefully I will post new PCB this evening.
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Old 23rd April 2014, 10:59 AM   #12
mravlca is online now mravlca  Slovenia
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New circuit and new PCB. What do you think? I also had an idea to use rectifier bridge something like DBLS209G...

BR,
Ales
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File Type: jpg TPS7A_2X_SCHEME.JPG (83.0 KB, 514 views)
File Type: jpg TPS7A_2X_PCB.JPG (150.3 KB, 419 views)
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Old 23rd April 2014, 01:03 PM   #13
mravlca is online now mravlca  Slovenia
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And a little bigger version, using SMD dip switch for configuring output voltage.

BR,
Ales
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File Type: jpg PCB_DIP.JPG (157.5 KB, 407 views)
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Old 24th April 2014, 04:44 PM   #14
mravlca is online now mravlca  Slovenia
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Something like this maybe? Dimensions are 21.5mmx15.80mm, I could maybe squeeze it a little bit if using smaller solder jumpers.

BR,
Ales
Attached Images
File Type: jpg 3pin_PCB.JPG (113.8 KB, 370 views)
File Type: jpg Model_3pin_top.jpg (246.5 KB, 376 views)
File Type: jpg Model_3pin_bottom.jpg (111.6 KB, 163 views)

Last edited by mravlca; 24th April 2014 at 05:07 PM.
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Old 24th April 2014, 05:08 PM   #15
mravlca is online now mravlca  Slovenia
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Quote:
Originally Posted by mravlca View Post
Something like this maybe? Dimensions are 21.5mmx15.80mm, I could maybe squeeze it a little bit if using smaller solder jumpers.

BR,
Ales
Something like this
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File Type: jpg 3pin_PCB.JPG (96.2 KB, 135 views)
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Old 24th April 2014, 05:37 PM   #16
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Hello,

Second version of smal 3pin regulator is nice.
For big version i suggest complete regulator with diodes... make no sense half of big regulator to use. Dip switches is very good idea. Maybe do it so that can be brakable in more pieces if we use just one regulator. So AC input 4 smd schotky diodes big capacitor or even CRC and combination. Maybe at the output resistor diode combination for eye checkind that regulator is working and for empty the regulator if it is not connected to any load.

Odlično, sporoči kdaj bo izdelava in se priključujem nakupu, ker so doma v predalu TPS-ji neuporabni
l.p.
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Old 24th April 2014, 07:39 PM   #17
Shelby is offline Shelby  Austria
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Hi, you mentioned you will design this regulator for 3.3, 5 and 12V. This would be excellent to supply a PC. What are the max current capabilities of your design? Is it possible to have a 1,35V supply as well?
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Old 25th April 2014, 10:26 AM   #18
mravlca is online now mravlca  Slovenia
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Quote:
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Hi, you mentioned you will design this regulator for 3.3, 5 and 12V. This would be excellent to supply a PC. What are the max current capabilities of your design? Is it possible to have a 1,35V supply as well?
Hi,

regulator has programmable voltage output, so setting 3.3V 5V and 12V isn't a problem. Current capability is 1A. No, 1.35V isn't possible to have, but 1.4V is.

BR,
Ales
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Old 25th April 2014, 05:12 PM   #19
mravlca is online now mravlca  Slovenia
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Default Final version of 3pin regulator?

I believe this is the final version of 3pin regulator. Dimensions are 21.5mm*14.45mm, and this is really small. I added sense pins for + and -, this would improve quality of regulator, but if not needed they can be shorted with solder jumpers. (BTW I got hint via PM for sense pins). Through the weekend I will also try to complete PCB for dual voltage, and in the beginning of the next week, send gerbers for PCB production.

BR,
Ales
Attached Images
File Type: jpg 3pin_scheme.JPG (54.4 KB, 162 views)
File Type: jpg 3pin_PCB.JPG (135.8 KB, 169 views)
File Type: jpg Model_3pin_top.jpg (272.9 KB, 152 views)
File Type: jpg Model_3pin_bottom.jpg (117.5 KB, 113 views)
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Old 27th April 2014, 04:32 AM   #20
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can the input and output caps be tantalum KEMET make?
Generally its said Tantalums are better than ceramics or may be equivalent to ceramic
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