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. |
Jens Willy Johannsen
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!