SLVAFG6B December   2022  – November 2024 TPS25762-Q1 , TPS25772-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Terms and Abbreviations
  5. 2 SPM Engine Overview
  6. 3Multi-Port Power Allocation Policy
    1. 3.1 Assured Capacity Policy
    2. 3.2 Shared Capacity Policy
      1. 3.2.1 Fair Share Power Policy
        1. 3.2.1.1 Blind Sink Support
    3. 3.3 Hybrid Mode
  7. 4Power Foldback Policy
    1. 4.1 Thermal Foldback Operation
    2. 4.2 Engine On/Off Transition Management
      1. 4.2.1 Engine On/Off Power Foldback Operation Example
  8. 5Multi-Port Power Allocation Policy Examples
    1. 5.1 Assured Capacity Policy Example
    2. 5.2 Fair Share Power Policy Example
      1. 5.2.1 FSP Policy Example – Blind Sink Support
      2. 5.2.2 FSP Policy Example – Blind Sink Support With Max Power
    3. 5.3 Hybrid Mode Example
  9. 6References
  10. 7Revision History

1.1 Terms and Abbreviations

Table 1-1 Terms and Abbreviations
Term Description
Blind Sink A Sink not returning Sink Capabilities per system power requirement.
Contract An agreement on power level reached between a Source and Sink.
FSP Fair Share Power
Good Sink A Sink correctly returning Sink Capabilities per system power requirement.
Negotiation The PD process between a Sink and Source:
  • The Sources advertises its Source Capabilities.
  • The Sink requests one of the advertised capabilities.
  • The Source accepts the request and provides power accordingly

The results of the negotiation is a Contract for power delivery/consumption between the TPS257xx-Q1 and Sink devices.
PD USB Power Delivery
Port Partner A USB Type-C PD device or host that is connected to a TPS257xx-Q1 port. In the scope of this application note, Port Partner is used to indicate a Sink.
PDO Power Data Object. What is used to expose a Source's power capabilities or a Sink's power requirements.
Sink The Port Partner consuming power from VBUS; most commonly a device. In this application note, Sink refers to devices connected to the TPS257xx-Q1.
Sink Capabilities A PD message reported by the Sink, which includes PDO to convey Sink's operational power requirements. Also referred to as Sink Cap.
Source The Port Partner supplying power over VBUS; most commonly a downstream facing port. In this application note, Source refers to the TPS257xx-Q1.
Source Capabilities A PD message reported by the Source, which includes PDO to convey Source's capabilities to provide power. Also referred to as Source Cap.
SPM Engine The TPS257xx-Q1's integrated subsystem responsible for the operational function of the System Power Management