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TPS7A4700 low noise LDO regulator PCB

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mravlca

mravlca

Member
Joined 2009
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.
 

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Last edited:
M

MKuni

Member
Joined 2013
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 ?
 
mravlca

mravlca

Member
Joined 2009
MKuni said:
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 ?
Click to expand...

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:
nautibuoy

nautibuoy

Member
Joined 2010
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:
mravlca

mravlca

Member
Joined 2009
nautibuoy said:
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
Click to expand...

Hi Ray,

thank you for your comment. I am currently working on a simple guide how to setup output voltage, what transformer to use and the purpose of those aluminum things etc... That aluminum is meant to be used as a heatbridge but I need to buy some standoffs to make presentation correct.

Best Regards,
Ales
 
nautibuoy

nautibuoy

Member
Joined 2010
mravlca said:
Hi Ray,

thank you for your comment. I am currently working on a simple guide how to setup output voltage, what transformer to use and the purpose of those aluminum things etc... That aluminum is meant to be used as a heatbridge but I need to buy some standoffs to make presentation correct.

Best Regards,
Ales
Click to expand...

Thanks Ales, it looks like your on the case...

I had assumed the aluminium thing was to couple the regulator chip to the chassis or a heatsink, sandwiched under the board. The standoffs will hold it in place right?

Ray
 
mravlca

mravlca

Member
Joined 2009
nautibuoy said:
Thanks Ales, it looks like your on the case...

I had assumed the aluminium thing was to couple the regulator chip to the chassis or a heatsink, sandwiched under the board. The standoffs will hold it in place right?

Ray
Click to expand...

Yeah, standoffs should hold it in a place, but you do need to use silicone thermal insulator pad between PCB and aluminum. You can also fix it to base with screw, the hole needs to be of 6mm diameter.
 
mravlca

mravlca

Member
Joined 2009
Simple user manual

Hi guys,

I made simple manual how to use these PCBs. I also did mounting plan for both PCBs, so drilling holes for mounting is easier and more accurate.

Best Regards,
Ales
 

Attachments

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Last edited:
L

linuxfan

Member
Joined 2007
Hi Ales, I would like to use your supply as a pre-regulator for a clock/isolator board, similar to the Acko board.

The clocks and isolators will have onboard 3.3V regulation - a surface-mount LDO regulator for the isolators, and Paul Hynes-style shunt regulator for the clocks.
Your regulator would be supplying somewhere between 5V - 6V at a single connection to this board.

My (possibly stupid) question is - since your regulator will be supplying 2 different loads, is it still worth connecting the "sense" wires to the single connection point at the board?

Thanks.
 
mravlca

mravlca

Member
Joined 2009
linuxfan said:
Hi Ales, I would like to use your supply as a pre-regulator for a clock/isolator board, similar to the Acko board.

The clocks and isolators will have onboard 3.3V regulation - a surface-mount LDO regulator for the isolators, and Paul Hynes-style shunt regulator for the clocks.
Your regulator would be supplying somewhere between 5V - 6V at a single connection to this board.

My (possibly stupid) question is - since your regulator will be supplying 2 different loads, is it still worth connecting the "sense" wires to the single connection point at the board?

Thanks.
Click to expand...


Hello,

yes, it is still worth connecting then sense wires to single connection point at the board. Regulator will eliminate voltage drop over the wires, therefore always supplying 5V directly on the board. How much current consumption does your board have?

Best Regards,
Aleš
 
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