SLVAFH6 November   2023 LM25066 , LM5066 , LM5066I , TPS25984 , TPS25985 , TPS25990 , TPS536C9T

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2What are PSYS™ and PSYS_CRIT#™?
  6. 3Implementation of PSYS Monitor
    1. 3.1 Existing Designs
    2. 3.2 Proposed Designs
  7. 4ISYS Resistor (RISYS) and Gain (ISYS_IN_GAIN) Selection in TPS536C9T VR14 Controller
    1. 4.1 Steps to Calculate the Value of RIMON or RISYS and ISYS_IN_GAIN
    2. 4.2 Design Example
  8. 5Functional Verification of PSYS and PSYS_CRIT# in TPS536C9T VR14 Controller Using TPS25984, TPS25985, or TPS25990 eFuses as PSYS Monitor
  9. 6Extraction of Platform Current Information With Multiple PSYS Monitors Connected to the Same PSU
    1. 6.1 Designing the Non-Inverting Summing Amplifier
    2. 6.2 Design Guideline and Example
  10. 7Summary
  11. 8References

7 Summary

This application note outlines the implementation of the PSYS monitor using either a single TPS25984, TPS25985 or TPS25990 eFuse or a parallel combination of TPS25990 and TPS25984/5 eFuses in higher current designs for incorporating the PSYS and PSYS_CRIT# functionalities in a VR14 controller powering CPUs or GPUs. TPS25984, TPS25985 or TPS25990 eFuses serve both the purposes of providing smart input power path protection features as well as accurate and high-bandwidth input current monitoring. This makes TPS25984, TPS25985 or TPS25990 eFuses well-designed for the PSYS monitors as per the requirements specified in the Intel® VR14 specifications. The system designers do not need to add any more extra active components for implementing the PSYS monitors.