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ROV power board

Here are Eagle schematic and board files as well as BOM for the ROV power board.
I moved all the high voltage/current stuff to a separate PCB and separated the control connections by using optocouplers.

That should help avoiding the electrical noise from the power MOSFETs switching at 20 kHz for the thruster motors.

BOM

Amount Item Spec RS no. Comment
1 TE Micro-MaTch 12 pos female 6804978 Or just solder wires directly to the board
1 TE Micro-MaTch 12 pos male 6804993
1 12 lead ribbon cable 2899852 This is actually 14 leads. Peel off two or use separate wires.
6 IRLS3034-7 MOSFET 6887257
6 FOD3180 optocoupler DIP-SMD 6712706
7 Screw terminals BLK 4813989
7 Screw terminals RED 4813973
6 SMD diode S5BC 7514821
6 SMD capacitor 100 µF 7472871
6 Ceramic bypass cap. 0805 0.1 µF 6480979 Or any other 0.1 µF 0805 ceramic cap.

Files

Eagle schematic and board files


2 comments on "ROV power board"
Carlos says:

Hi Jens,

I was wondering if you could help me with a problem, I want to switch a 16v motor from a Microcontroller using a PWM at 10KHz.

Microcontroller => FOD3180 => Mosfet => Motor and diode

Mosfet = IRLTS6342TRPBF
Flywheel diode = FR10M

When i check with the oscilloscope the output of the FOD3180 without connecting the Mosfet the signal looks good, then when I connect the mosfet and want to see the output, the FOD3180 heats and then it stops working. Can you give me any advice please? Maybe the MOsfet i selected is not correct?

Thanks!

Jens Willy Johannsen says:

Hi Carlos

I don't have any real advice but I would try to simplify the circuit to see when it stops working: try switching a simple LED on/off, possible using a different MOSFET and so on…

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