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Question over current
#1
I am pretty sure I know the answer, but I want to verify it before I go about thinking wrong and frying a unify.

Going to hook up my Unify Pro 5V to a CL Racing F4 board. The voltage/amperage rating for the VTX/Camera on the board is 7.6V @ 1.2A. The VTX is rated at 4.5-5.5V in @ 600mA. So this tells me the amperage would be too high for the VTX and could potentially fry it. So I would next want to run it from the LED 5V pads on the board. They are rated at 5V, but say do not run more than 500mA. So that would seem futile as well. Has anyone run a Unify Pro 5V off of one of these boards?
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#2
The output of 7.6V @ 1.2A on your FC means the that pin gives 7.6V and you can draw 1.2A of current from it without burning the voltage regulator on the FC. 1.2A is more like the tolerance, your FC will supply as much current as your VTX needs, it doesn't mean it will pump 1.2A to your VTX constantly.

But 7.6V is too high for the Unify Pro 5V, you can actually fry the VTX because of the excessive voltage.
I believe there is a built-in 5V regulator on the CL Racing F4 with 1.2A rating, so you should be able to power your VTX with 5V.

Not sure where you get the max amp for LED pad from, if there is really a current limit it's probably due to the size of the copper trace...
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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#3
Oscar Wrote:The output of 7.6V @ 1.2A on your FC means the that pin gives 7.6V and you can draw 1.2A of current from it without burning the voltage regulator on the FC. 1.2A is more like the tolerance, your FC will supply as much current as your VTX needs, it doesn't mean it will pump 1.2A to your VTX constantly.

But 7.6V is too high for the Unify Pro 5V, you can actually fry the VTX because of the excessive voltage.
I believe there is a built-in 5V regulator on the CL Racing F4 with 1.2A rating, so you should be able to power your VTX with 5V.

Not sure where you get the max amp for LED pad from, if there is really a current limit it's probably due to the size of the copper trace...


I thought it was odd too, but it came off of Chengs website, so I would have to think it is true. But more than likely, it only sucks down 600mA at the 800mW setting. So staying under that, around 400mW, should be ok. That is what I normally use.
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#4
I won't take any responsibility, but if I were you I would be like "screw it, I will just do it" LOL Big Grin
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
[-] The following 1 user Likes Oscar's post:
  • s3npai
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#5
(16-Dec-2017, 12:31 AM)Oscar Wrote: I won't take any responsibility, but if I were you I would be like "screw it, I will just do it" LOL Big Grin

I like your style sir! I'm actually in the process of emailing Lin-sensei to see what he recommends. Hopefully it's not, get a new board. Will update with an answer when I get one!
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#6
According to the specs, the board also has a 5V 1.2a BEC. It's just not filtered
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#7
(16-Dec-2017, 02:43 AM)RENOV8R Wrote: According to the specs, the board also has a 5V 1.2a BEC. It's just not filtered

Wonder which pad that would be? I just don't want to accidentally over power it.
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#8
The amp rating for supply isn't what it pushes to the device. It is the max the device can draw from the supply. So you can't over power a device by hooking it up to a high amp power supply.

The 5V are clearly marked on the FC.
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#9
Thanks for all the help everyone! I happened to have a chain going with Mr. Lin from when it was warrantied. I asked him and he said to put it up to the 5V led pad. So on we shall go!!
[-] The following 1 user Likes s3npai's post:
  • Oscar
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