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TDA4VH-Q1: the function of Kelvin Sensing circuit

Part Number: TDA4VH-Q1

Dear expert,

Could you tell me what is the function of below circuit? Can our customer remove that? Thanks.

  • TI uses the circuit for testing of noise level on the low voltage/high current power rails.  This is a test function/debug function, and certainly not needed on an end product.  Note these power rails (VDD_CORE, VDD_CPU) can have significant current spikes, so if power delivery network is not properly designed, you can have issue with noise levels on these power rails.

  • Hi Robert,

    Thanks for reply. Besides Kevin sensing, I know we also often measure the voltage ripple on the capacitor under the SoC to determine the noise level. What is the difference between these 2 methods?

  • Measuring the voltage ripple on a decouple capacitor is impacted by the capacitor on which you are measuring - acts as a filter.  And if the capacitor is removed, then the circuit is also impacted.  The goal of the Kelvin Sense is to get more accurate measurement without impacting the circuit (with capacitor removal, with probe itself, etc).