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LM70840-Q1: Regarding Shunt Resistor

Danish Malhotra
Prodigy 50 points
Part Number: LM70840-Q1

Tool/software:

Hello Team,

We are planning to use the LM70840-Q1 buck converter in our product. We have a query regarding the shunt resistor (Rs) recommended in the design. If we don't want to use the sensing functionality, what are the recommendations for the ISNS+ and Vout pin? Can we connect ISNS+ to GND and Vout to output voltage if we don't want the sensing functionality? 

Thanks,

  • 0
    TI__Guru 56345 points

    Hi,

    The shunt resistor is used to set the current limit. Without the sense resistor, there is a potential of a catastrophic failure if a short occurs at the output. 

    If you don't want the sensing functionality, you can short both ISNS+ and VOUT to the output.

    Ben