Author Topic: Connection Points for Prototype DC-DC Modules  (Read 681 times)

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Offline OneGeekGuyTopic starter

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Connection Points for Prototype DC-DC Modules
« on: August 20, 2020, 10:54:47 am »
Hi,

I am just developing DCDC converted based on LM25145 IC from Texas instruments and I would like to know your opinion about one topic that always make me doubt, which kind of connections should I use in this modules, talking about INPUT-OUTPUT, the main idea is to have enough current capability (2Amp output 16V and  around 1.6A  20V input) and also good let's say....testing capability, in order to connect easily this module to power supply, load....

I have seen different approaches:

-- Using terminal block connectors THT , I don't really like to be using the screwdriver each time I would like to connect it...
-- Using SMD big pads, and connect them with Crocodile Clips, the connection between is not the best
-- Using 2mm banana holders or post , maybe the best connection and also easy way?

Do you know if there is something like a....press fit connector but one which you could extract easily? What is your preferred connection? Solder some cables and that's all? Easy way  :D

Thanks for your comments.

BR
 

Offline OM222O

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Re: Connection Points for Prototype DC-DC Modules
« Reply #1 on: August 20, 2020, 11:04:41 am »
If you don't require connection to wires: just use normal THT pads, with about 1mm hole on your module.

Then for the actual PCB use some SMD pads that line up with the holes, place the module on top and solder it on.
 
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Offline Vovk_Z

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Re: Connection Points for Prototype DC-DC Modules
« Reply #2 on: August 20, 2020, 01:05:22 pm »
It depends a bit on needed connection resistance too. There are a lot of options for currents less then 3 A, but they differ a lot with a value and stability of resistance connection. A starting point is NX2500 type connectors - they are suited for signal wires but may work up to 3A (but not good in real with > 0.5 A current).
For high requirements I use 4.8 mm Faston or even 6.3 mm Faston. They are quite cheap, don't need a screw-driver, and give a quite tought connection (and fast). Only crimping tool is needed for many connectors (or only a soldering tool when few connectors). They require a comparable few PCB space too.
There is 2.8 mm Faston too. It takes space a bit less then 4.8 or 6.3 mm.
I started to use Fastons and are almost happy now (with all my strict requirements).
« Last Edit: August 20, 2020, 01:15:42 pm by Vovk_Z »
 
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Offline OneGeekGuyTopic starter

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Re: Connection Points for Prototype DC-DC Modules
« Reply #3 on: August 20, 2020, 02:11:31 pm »
It depends a bit on needed connection resistance too. There are a lot of options for currents less then 3 A, but they differ a lot with a value and stability of resistance connection. A starting point is NX2500 type connectors - they are suited for signal wires but may work up to 3A (but not good in real with > 0.5 A current).
For high requirements I use 4.8 mm Faston or even 6.3 mm Faston. They are quite cheap, don't need a screw-driver, and give a quite tought connection (and fast). Only crimping tool is needed for many connectors (or only a soldering tool when few connectors). They require a comparable few PCB space too.
There is 2.8 mm Faston too. It takes space a bit less then 4.8 or 6.3 mm.
I started to use Fastons and are almost happy now (with all my strict requirements).

I never thought about use Faston connectors..., I will take a look at it, maybe I will try it.


If you don't require connection to wires: just use normal THT pads, with about 1mm hole on your module.

Then for the actual PCB use some SMD pads that line up with the holes, place the module on top and solder it on.

Umm, that is a good idea to fix different modules, I will take note! Now I am thinking more about stand-alone modules, to test them alone.


Thanks

BR
 

Offline TimFox

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Re: Connection Points for Prototype DC-DC Modules
« Reply #4 on: August 20, 2020, 03:53:46 pm »
Another advantage of male Fastons is that one can solder to them directly, if desired.  I believe that all males have a hole through the blade that can be used for the wire.
 


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