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TPS650830: VR feedback pins.

Part Number: TPS650830
Other Parts Discussed in Thread: PMP20021

On page 129 of the datasheet  shows the VR feedback pins connected across the output capacitor. However document number tidroc4.pdf shows the feedback pins connected to some feedback point which is not the output capacitor. Is the proper connection point of the feedback pins at the output capacitor or at the power pins of the processor?

  • Thank you for posting your question on the TPS650830 in the e2e forum. Your thread has been assigned to the expert within TI, who will reply to this thread as soon as possible and attempt to answer you question.
  • To help the experts answer your question, can you provide a link to the "tidroc4.pdf" you are referring to?

    When I search for this document, I find www.ti.com/.../tidroc4.pdf , but this is the BOM for the PMP20021 power reference design which does not use the TPS650830 PMIC.
  • I had a typo in the file name. It is tidrco4.pdf. Sorry for the inconvenience.
  • Thomas,

    For TPS650830, we support both local sense as well as remote sense of the voltage. If you are want to monitor and regulate the voltage close to PMIC, we need to connect feedback pin to the capacitors close to the inductor. In some cases where the acutal load is further way from the PMIC, and you expect a voltage drop along the trace with local sense, you can connect the feedback traces to the remote capacitor close to the load. The schematic shown is a daugther card which fits to intel mother board. The connections are made such that it can also work stand alone or monitor load on the mother board. In actual application, we should connect either to local or remote sense points and not both.

    Jay