Is is possible to add STO functionality to the Powerstep01 by switching the VCC Line?

CKres.1 · ‎2021-12-14

The idea is to switch the VCC Line with a FET to get STO (safe torque off) functionality. Is this possible or can this cause problems (cross current or similar)? In the attachment is an image of the Idea.

Cristiana SCARAMEL · ‎2021-12-20

Hi @CKres.1 and welcome to the ST Community.

I suggest to add the FET between VS and VSREG.

In this way you remove the power of the gate drivers (VCC) and allow the device a more robust shutdown sequence thanks to the UVLO protection.

Let me know if this info is useful to you, if yes please "Select as Best" label to close the topic.

If you feel a post has answered your question, please click "Accept as Solution"

View solution in original post

Cristiana SCARAMEL · ‎2021-12-20

Hi @CKres.1 and welcome to the ST Community.

I suggest to add the FET between VS and VSREG.

In this way you remove the power of the gate drivers (VCC) and allow the device a more robust shutdown sequence thanks to the UVLO protection.

Let me know if this info is useful to you, if yes please "Select as Best" label to close the topic.

If you feel a post has answered your question, please click "Accept as Solution"

CKres.1 · ‎2022-01-04

Okay thanks I'll try that but it'll take some time until we get the PCBs