TPS7A4700 low noise LDO regulator PCB - diyAudio
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Old 20th October 2014, 02:04 PM   #1
mravlca is offline mravlca  Slovenia
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Default TPS7A4700 low noise LDO regulator PCB

Hi folks,

I have busy lately and I have built some PCBs with TPS7A4700 regulator. This is a low noise regulator with output capable of 1A.

Specs
Input voltage range: 2.2V to 25V AC, 3V to 36V DC
Output voltage range: 1.4V to 20.5V DC
Output voltage noise: 4uVrms (10Hz, 100kHz)
Dropout voltage: 350mV at 1A
Output current: 1A (with sifficent heatsink)

More details
-Output voltage is configurable via solder jumpers
-Sensing pins for better performance, DUAL PCB has sensing for positive voltage only, SINGLE PCB has sensing for positive and negative voltage, if not used they can be bridged to output via solder jumpers
-DUAL PCB can be easily configured to operate in symmetrical or single voltage output (solder jumper), transformer with dual secondary windings is a must when you use symmetrical output
-SINGLE PCB can have better capacitor in sensing circuit, there is space for 5mm lead spacing capacitor (for example: Wima 1uF/63V PET)
-DUAL PCB uses bridge rectifier, SINGLE PCB uses rectifying diodes to convert AC voltage to DC voltage.
-user can fit 0805 LED diode and dedicated resistor to indicate working state of regulator

PCB size & colour
-DUAL PCB: 77mm x 37mm
-SINGLE PCB: 75mm x 26mm
-all PCBs are in black colour

What is in the offer?
TPS7A4700 single voltage output 21

What do you get for the price
Single PCB with smt components soldered on 1pcs
SBYV27 rectifying diode 4pcs
Epcos 1uF/63V PET capacitor 1pcs
Screw PCB connector 2pcs
attached aluminum block 1pcs (works as heatsink or heatbridge)
M3 nuts 4pcs
standoffs 4pcs
Panasonic FR capacitor 1pcs

Shipping & fees, payment
Priority shipping worldwide for one PCB is 3,for each additional PCB you'll have to add 1. I accept only PAYPAL, fees are included in the price. You'll receive invoice for what you are buying.

Price calculation examples:
1PCS single PCB + shipping = 24
2PCS single PCB + shipping = 46
3PCS single PCB + shipping = 68
...etc
Best Regards,
Ales

UPDATE: 27.2.2015 Added more components to the offer,updated price and shipping.
Attached Images
File Type: jpg TPS7A4700_single_schematic.JPG (92.4 KB, 2329 views)
File Type: jpg TPS7A4700_single_PCB.JPG (178.3 KB, 2276 views)
File Type: jpg TPS7A4700_dual_scheme.JPG (122.4 KB, 2220 views)
File Type: jpg TPS7A4700_dual_PCB.JPG (282.8 KB, 2180 views)
File Type: jpg 20141020_151823.jpg (947.3 KB, 2177 views)
File Type: jpg 20141020_151852.jpg (237.6 KB, 763 views)
File Type: jpg 20141020_151900.jpg (847.6 KB, 625 views)
File Type: jpg 20141020_151909.jpg (247.1 KB, 553 views)
File Type: jpg 20141020_151919.jpg (270.3 KB, 871 views)
File Type: jpg 20141020_151926.jpg (852.2 KB, 763 views)

Last edited by mravlca; 27th February 2015 at 07:30 AM. Reason: additional information
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Old 23rd October 2014, 03:15 PM   #2
mravlca is offline mravlca  Slovenia
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Arrow Heatsinks are in

Hi guys,

So I have received heatsinks and PCBs are now ready to be shipped out.

Best Regards,
Ales
Attached Images
File Type: jpg IMG_20141023_170524.jpg (881.3 KB, 409 views)
File Type: jpg IMG_20141023_170622.jpg (943.9 KB, 657 views)
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Old 2nd November 2014, 09:04 AM   #3
mravlca is offline mravlca  Slovenia
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Default Filtering capacitors

Hi guys,

Now I can also offer DC filtering capacitors, they are Panasonic FR 3300uF/25V. Price for one is only 1.

Best Reards,
Ales
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Old 2nd November 2014, 02:29 PM   #4
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How much is one pcb single voltage pcbs with all parts?
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Old 4th November 2014, 09:17 AM   #5
mravlca is offline mravlca  Slovenia
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Quote:
Originally Posted by MASantos View Post
How much is one pcb single voltage pcbs with all parts?
Hi MASantos,

price for one single PCB is 19(all parts)+3 shipping= 22.

Best Regards,
Ales
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Old 10th November 2014, 02:25 PM   #6
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Does that mean that dual PCB will be able to handle 2A current ?
What is the price for Dual PCB ?

Thanks
Regards,
Kuni
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Old 11th November 2014, 02:46 PM   #7
mravlca is offline mravlca  Slovenia
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Quote:
Originally Posted by MKuni View Post
Does that mean that dual PCB will be able to handle 2A current ?
What is the price for Dual PCB ?

Thanks
Regards,
Kuni
Hi Kuni,

depends how you look at it. Dual PCB can handle 1A per voltage rail, so 1A for +12V and 1A for -12V. Price for one is 35 and with Panasonic FR is 37.

Best Regards,
Ales
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Old 11th November 2014, 10:30 PM   #8
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I want to use voltage regulators for Audio PC linear PSU and see what maximum results can be achieved.
My thought is to use 7A current LT1083 for 12v, 2A your regulators for 3.3V and 2A your regulators for 5V. In that case I would require 4x your regulators.
Are you building higher current regulators and is it required to have that high end regulation for PC PSU at all ?
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Old 12th November 2014, 05:30 PM   #9
mravlca is offline mravlca  Slovenia
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Quote:
Originally Posted by MKuni View Post
I want to use voltage regulators for Audio PC linear PSU and see what maximum results can be achieved.
My thought is to use 7A current LT1083 for 12v, 2A your regulators for 3.3V and 2A your regulators for 5V. In that case I would require 4x your regulators.
Are you building higher current regulators and is it required to have that high end regulation for PC PSU at all ?
Nice idea you have there, but if you connect two regulators TPS7A4700 outputs together in parallel it just won't work properly. For your application I recommend you to look for after LT3080 or LT3081, these regulators are made for current sharing. Linear regulation would definitely be better for PC than smps in therms of sound and noise levels.

Best Regards,
Ales

Last edited by mravlca; 12th November 2014 at 05:33 PM.
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Old 12th November 2014, 05:42 PM   #10
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Hi Ales, just to let you know that my package arrived safely today. The board looks very nice.

A suggestion though, it would be good if you could make a simple user guide available. I know how to set the correct voltage but others won't. Also, I have a small heatsink plus a lump of metal with an Allen bolt; what's your thinking on the latter? And, what current/voltage range is the heatsink good for?

Thanks again

Ray

Last edited by nautibuoy; 12th November 2014 at 05:44 PM.
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