SLVAFG6A December   2022  – November 2023 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 Start or Stop Transition Management
      1. 4.2.1 Engine Start or Stop 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

3 Multi-Port Power Allocation Policy

The SPM Engine, which contains the Multi-port Power Allocation Policy, is configurable using the TPS257xx-Q1-GUI. The following parameters are configured per system requirements for correct SPM operations.

Table 3-1 SPM Engine Parameters
SPM Engine Parameters Description
Total USB VBUS Power

(System Max Power)

 Total system power capacity that is allocated to all ports
Port Max Power Maximum VBUS power for each port. Power contract is limited to the maximum value configured in this parameter
Port Min Power Minimum VBUS power for each port. Minimum power configured in this parameter is designed for each port.

There are two configuration views in the GUI: Simple Configuration and Advanced Configuration. While the Simple Configuration controls can satisfy the device configuration requirements for most systems, additional controls for some modules are available in the Advanced Configuration. Refer to the TPS257xx-Q1 GUI Configuration Guide for more information. Figure 3-1 and Figure 3-2 show the GUI's SPM power parameter configuration in the Simple Configuration view and Advanced Configuration view. Either configuration view can be used to framework the SPM power parameters.

GUID-20221004-SS0I-V9HF-Z37L-JVKTCGQLL2MN-low.svg Figure 3-1 SPM Engine Configurable Parameters – Simple Configuration
GUID-20230921-SS0I-7PNK-6LMX-TPXVTXF14CTV-low.png Figure 3-2 SPM Engine Configurable Parameters – Advanced Configuration