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Using a PDB Instead of Splicing a Bunch of Wires?
#1
Sort of a one off question here.

I have a bunch of 12V peripherals (VTX, LEDs, FPV Cam).  These are all being powered off the 2S lipo with a Polulu 7A 12V step-up reg.  Rather than splicing a bunch of power leads together, can I just use a PDB and its ESC pads for cable management?

Specifically ...

2S Lipo --> Polulu 12V step-up --> PDB --> 12V devices off the ESC pads

I've tallied up the amp draw and it comes out to 1A without the LED bar which I can't get amp draw specs for (and my MM doesnt have amp reading).  So let's assume double it to 2A.  The Polulu has a lot of overhead at 7A but will a typical PDB be able to handle 2A draw? I'm assuming this should be nothing since most of our tiny quads are rated at 25A-30A.

The specific PDB I plan to use is the 30x30 Armattan Japalura PDB for which I can't find specs.

[Image: Japalura-PDB-73135-1493473335-472x472.jpg]
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#2
If you are running only 2S to the ESC, then you can't just connect the step-up 12V to the PDB. You have to determine either the step-up 12V or 2S should go to the PDB. If 12v then all the ESC pads on the PDB will be 12V. If 2S then all ESC pads is 2S. Since the PDB is not a step-up but a step-down, the 12V regulator on the PDB will not put out 12V. If you are using 3S, then you can get rid of the 12V step-up all together. But I assume you are not using 3S for your ESC.

This is a better PDB for what you are trying to do.

https://www.getfpv.com/lumenier-4power-mini-pdb.html
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#3
Right, I am using 2S. Just to clarify, I am not referring to the 12V and 5V regulators on the PDB itself. In fact, pretend those did not exist on the PDB just the ESC +/- pads. So I want 12V coming out of all those pads which is why the Polulu is between the 2S lipo and the PDB. I hope that makes sense. The point of all this is to just avoid a bundle of spliced wires coming off of the lipo. My concern was whether the PDB itself could handle the current load. My conservative estimate is 2A continuous and since ESCs are upwards of 25-30A, I'm guessing I should be totally fine unless I am overlooking the obvious?
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#4
PDB is just straight connection to the VBAT. So yes, it will easily take a few amps.
[-] The following 1 user Likes voodoo614's post:
  • the.ronin
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#5
Thanks voodoo thats what I thought just needed a sanity check before I blew anything up. Again. Big Grin
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