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TPS53647: VSP pull up

Charlie Xiao
Expert 5760 points
Part Number: TPS53647

Hi,

In the datasheet, why the VSP pull up? Why does the circuit need R9? Thanks.

Best Regards

Charlie Xiao 

  • 0
    TI__Expert 8960 points

    Hi Charlie,

    Those serve two purposes.

    1. The control loop remains closed in the event the remote sense lines are disconnected for whatever reason.

    2. It provides feedback from the immediate output of the controller, before going through the RLC network that carries power to the load (the traces to the processor may have non-trivial inductance & resistance, and there's caps directly underneath the CPU). This causes the feedback into the controller to be a combination of the immediate output & the remote sense, with most of the weight on the remote sense.

    Thanks,

    Travis