What range of AC IN voltage can be applied to STEVAL-CTM012V1

[Dense505]

I have the board, I have downloaded all of the data and guides that I can find but there is no mention of AC IN voltage range. I would like to drive a small 400V induction motor. 400VACrms would mean 566V peak across the capacitor at no load.

I note that the main DC bus capacitor is rated for 450V which would be the peak voltage of 318VACrms input. I can replace the 330uF 450V capacitor with a 270uF 600V capacitor but I am unsure of the voltage rating of the other components and I cannot find a complete schematic.

[Cristiana SCARAMEL · Accepted solution]

Hello @Dense505​ and welcome to the ST Community.

The STEVAL-CTM012V1 board has been designed to be powered at 230 Vac.

The data brief and user manual are being updated, in the meantime I attached a copy of board schematic.

If you want to use the board at higher voltage surely it is necessary to replace the bus capacitors and the fuse F1.

Moreover, according to your high voltage bus precision you may have to change bridge rectifier.

If you plan to use external bootstrap diode select the part number according to your HV ratings.

Finally, attention also to the MOSFETs drain-source breakdown voltage.

In any case here you will find the BOM to check all the parts ratings.

I hope these info are useful for your project.

 if I solved your doubts, if so please "Select as Best" label.