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POWERSTEP01 : sense resistor

naoki
Associate

Regarding the shunt resistors connected to the SENSEA and SENSEB pins, the UM1829 has three 0.1 ohm resistors connected. Why is this?

The datasheet says one 0.1 ohm resistor.

Do I really need three of them?

1 ACCEPTED SOLUTION

Accepted Solutions
Peter BENSCH
ST Employee

Welcome @naoki, to the community!

The shunts with 100mohms in the data sheet are only examples, further information on their calculation can be found in the UM1829, section 4. With the three 100mohms per channel connected in parallel, which can also be seen in the UM1829, fig 2, you can utilize the maximum output current of the powerSTEP01, the parallel connection also distributes the power loss over these three resistors.

Does it answer your question?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

View solution in original post

2 REPLIES 2
Peter BENSCH
ST Employee

Welcome @naoki, to the community!

The shunts with 100mohms in the data sheet are only examples, further information on their calculation can be found in the UM1829, section 4. With the three 100mohms per channel connected in parallel, which can also be seen in the UM1829, fig 2, you can utilize the maximum output current of the powerSTEP01, the parallel connection also distributes the power loss over these three resistors.

Does it answer your question?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Thank you for your reply.

I understand.