5V 3A source for minicomputer using FBL2360

3 years 2 months ago #29533132 by taakinsi
Hello,
We will need to power an on-board 5V 3A computer. It appears the 5V pin on the FBL2360 only does 200mA so will not work for this. Will we get reliable power if we use an external step down with a 24V/1.5A pin like DOUT4? We will need this to be very stable so how stable is the 24V pin over transient effects like regeneration? Any other recommendations to get the power output?

Thanks

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3 years 2 months ago #29533133 by blake
The motor controllers digital outputs do not output 24V. These are open drain fets that close to ground when activated, see page 45 of our User Manual.

I would recommend incorporating DC/DC converter to your system that will drop your battery voltage down to the 5V needed for your microcomputer

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3 years 2 months ago #29533135 by taakinsi
So what is the manual referring to when it says there is a 24V 1.5A regulated source?
We currently have a DC-DC converter connected to the battery but there are appears to be a source of voltage spiking which has damaged the computer so we are evaluating other options.

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3 years 2 months ago #29533136 by taakinsi
To be more clear on our setup, please see the attached drawing. Our mini-computer (RaspPi) uses the 5V output from the DC-DC converter but there have been failures which appear to be as a result of some transient effect (possibly estop switch). Is there any apparent fault? We are using a pretty basic automotive 24V-5V step down:
www.amazon.com/gp/product/B00J3MHRNO/ref...ilpage?ie=UTF8&psc=1

PS: Not shown in the drawing is another battery connection to PwrCtrl that is used as the ON-OFF switch for the system.
Attachments:

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3 years 2 months ago #29533138 by blake
As mentioned before, unfortunately the 5V source of our controller will not be able to deliver adequate current to power your RPi. This source is meant to power sensors and other devices that require less current.

You will need to come up with another method to power your RPi.

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3 years 4 weeks ago #29533192 by Erik
Did you fix it now Taakinsi? How did you do it?

I use a similar stepdown converter to get 5v , (also have another one for 12V and one for 18V).

I have issues to get another bldc driver running and some real experts on another forum advised me to use some capacitors paralel over the stepdownconverter. They have to be high quality capacitors for audio/video but i still have to test it...getting a bit tired of asking on several forums how to get things working. That bldc motordriver has died though so i 'm finding a replacement for it.

Also i have arduino's running on them but they have issues...it's hard to get a stable stepdown converter, i wished roboteq could help with that but they don't. I'm not an electrical expert so i just follow advice i get on other hobbyforums for RC .

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3 years 4 weeks ago #29533199 by taakinsi
I use the below item to step down the 24V from the battery:
www.amazon.com/gp/product/B00J3MHRNO/ref...ilpage?ie=UTF8&psc=1

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3 years 4 weeks ago #29533200 by Erik
Yes i read that already but you wrote that you had issues with it so i wondered how you fixed those issues?

there have been failures which appear to be as a result of some transient effect (possibly estop switch). Is there any apparent fault?

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3 years 4 weeks ago #29533201 by taakinsi
I discussed that on this thread: electronics.stackexchange.com/questions/...on-for-mini-computer

The general consensus is that it is because of some EMI. Make sure your high current/fast switching wires are well separated from your low-power electronics. I ended up re-wiring for better separation and putting sheet metal sheilding to protect the low power electronics.
The following user(s) said Thank You: Erik

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3 years 4 weeks ago #29533202 by Erik
Alright, thanks for the explanation and link. I also had my Arduino going erratic from EMI causing damage to other parts.

Also i bought a stepdown converter from ebay (36V to 18V 8A) but when i connected my lawnmower bl-motordriver to it the driver died immediately so i have to replace it which isn't easy.

I just hope that on this forum we can share our problems and solutions without having to go to other forums as well. But i'm disappointed in the help we get from the roboteq-team so we have to help eachother.

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