Hello! Today I was busy by housework, but found time for assembling motor driver board. I using perfboard for that, because I have possibility add some elements in circuit without etching new pcb. My motor driver board based on L6203 IC from ST, I used this chip before and it was a good experience. In start of the project, I wanted build motor driver on discrete MOSFETs, but it given me problem like needing separate radiators for cooling, I can't screw all transistors on one radiator or electronics enclosure, it will shorted the circuit. In case with L6203, I've all I need in one IC, which I can just screwing to enclosure and don't need additional radiator.

When I almost assembled this board I realise that all my previous experience was for very simple and stable application, but now motor driver will be in balancing board which means - frequently switching of direction and possibilities for inducing parasitic induction currents in output circuit of the driver. In application notes for this one, ST told that you need using snubber network (look applied picture). This network is drop the voltage which induced by motor own induction in moment of switching H-bridge FETs of the motor driver.

I don't have needed components for build it and I will try to visit local store tomorrow.