MDDS10 or SmartDriveDuo-10 is a first Cytron’s dual channel motor driver with smart features. This driver can stand up to 10A continuously and 30A for a few second. Wait, why 30A only for a few seconds? How about 15A, 20A? Actually it is not about current, it’s about HEAT. One of the important thing you need to consider when designing motor driver is HEAT. Yes, Mosfet can stand up more than 10A, but it also have temperature limit. Plus you need to consider others component’s temperature limit too. So, if you can dissipate MDDS10’s heat much more faster, your driver can stand up more amps!
I have design 3D file for MDDS10’s top cover with fan mounting hole. You can download the file here. It includes stl file where you can directly print using 3D printer or in case you want to modify it, you can edit 123dx file using 123D Design software.
1. Print the MDDS10’s top cover stl file using 3D printer. Diameter for screw hole is 3 mm, if the screw can’t fit, you can drill a bit.
2. Assemble the fan, make sure it blows to the board (not suck). Since we want to use the power from MDDS10’s board, the fan should be 5V. BTW, you can get the fan separately from Cytron online store here.
3. Connect all wires especially on terminal block. I’m using RC input mode in this tutorial. Put the PCB stand with height >= 35 mm, here is 40mm screw/nut PCB stand. not to forget the PCB stand for bottom side of PCB, we do not want the MDDS10 to shorted on robot structure, so get yourself another 4 of shorter PCB stand for bottom side of PCB, here is 10mm screw/screw type of PCB stand.
4. Fan will be powered via the 5V from the input connector. Connect red wire to 5V, black wire to GND. I’m not using the blue wire but I don’t want to remove it, so I just connect to the input pin (AN1/AN2) that not disturb the RC signal. Please do not simply connect the blue wire to other terminals, it is an output from the fan, the output is NPN/Open Drain, it will sink current. Now place the cover with fan to the top of MDDS10.
5. Please double check the fan. Make sure it is not touching any of the components of MDDS10. Screw the cover to the PCB stand.
6. Done! Now let’s test the performance! :-D. Do let us know the result too.