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TPS7H4001-SP: How to connect Negative Sense pin to TPS7H4001 when using remote sensing

Matty13763
Intellectual 390 points
Part Number: TPS7H4001-SP

Hi,

I am using the TPS7H4001-SP to power a processor.

The processor requires that I connect both the VDD_SENSE and SENSE_GND pins for remote sensing to work correctly.

I am a little stump on how I connect the SENSE_GND pin in this situation. Do I need to make this a trace (and not plane) in the layout and connect it to GND pin on the TPS7H4001?

Here is my drawing of the remote sense circuit.

Thanks!

  • 0
    TI__Guru 62930 points

    Jeff,

    Christian is out of the office until Monday.

    My understanding is that the ground sense will need to be kelvin connected with a trace, and not a plane.

    However, I would like for Christian to comment as he may have some additional insight or layout examples that he can share.

    He should be able to reply early next week. 

    Regards,

    Wade

  • 0 in reply to Wade Vonbergen
    Intellectual 390 points

    Thanks Wade! I appreciate your quick feedback!

    Jeff

  • +1 in reply to Matty13763
    TI__Genius 14540 points

    Hi Jeff,

    Apologize for the delayed response.  The TPS7H4001-SP does not have 'differential' remote sensing, therefore, any rise in SENSE_GND at the load due to parasitic resistances in the ground path will not be taken into account.  The best you can do is provide a low impedance path between the TPS7H4001-SP ground and the SENSE_GND node at the load. 

    If the losses in the ground path of the load are known, the resistor divider that sets VOUT can be slightly altered such that an offset of higher VOUT is provided but one that provides the exact target voltage with respect to the ground potential at the load.  This will hold true for the target load current at which the offset was determined.

    As a side note, we are developing new buck converters that will support differential remote sensing which should begin sampling in 2Q 2023.

    Thanks

    Christian