SDAA159 October   2025 XTR200

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Detailed Description
    1. 2.1 Current Measurement
    2. 2.2 Current Transmission
    3. 2.3 Additional Output Circuitry
    4. 2.4 Simulations
  6. 3Summary
  7. 4References

Abstract

High performance power supplies for server, cloud, or AI applications incorporate an output current monitoring pin which provides a scaled down representation of the output current. This current monitoring function provides valuable information about the real-time output current on different voltage buses. Current transmitter products, such as the XTR200, are useful building blocks for performing the current monitor function. These devices convert an input voltage to an output current with a transfer function specified by a single external resistor. The XTR200 also integrates the output transistor, protection circuitry, and diagnostic capabilities in an extremely small 2mm x 3mm WSON package. This application note gives an example circuit for a current monitor output designed to meet the requirements outlined in the OCP M-CRPS Base Specification and progresses through the relevant design steps for engineers to adapt this design to other applications.