Dear member of ST community,
I would ask you about the thermal characteristics of B-G431-ESC1 Motor Control evaluation board.
I purchased it few weeks ago and started to play with six step for beginning and later FOC algorithms. I observed on my board that if power supply V+ 18-20V is active and PWM outputs are switching, of course deadtime is set to ~500ns, board running at 170MHz the PCB temperature reaches ~50 °C or even more. The temperature is quite uniform. The DC/DC itself produces heat by switching and the power stage too, but for me seems to be a little to much. Is it normal or something is failed on the board? I removed the DC/DC converter and provided the 10V from external supply, the situation is similar.
PWM outputs disabled. In that case the heat is produced by DC/DC only. Is that normal? I did rough calculation based on datasheet and for me it looks to be too much for roughly 100mA output current.
Additional heat generated by 3-phase power stage itself when PWM enabled on all phases, no load attached to outputs, deadtime set, PWM freq = 30KHz. Temperature there is also ~50 °C if the DC/DC converter is removed.
Is that normal or it is corrupted?
Thank you for your response in advance.
