SLVAFW9 August   2024 LM51772

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Parallel or Multiphase Power Stages
    1. 2.1 Paralleling Power Stages
      1. 2.1.1 Load Balancing Requirement
    2. 2.2 Clock Generation
    3. 2.3 Interconnection of the Power Stages
  6. 3Application Implementation
    1. 3.1 Soft-start Capacitor
    2. 3.2 Compensation
    3. 3.3 Input and Output Capacitor
    4. 3.4 Usage of the Average Current Sensor
  7. 4Test Results
    1. 4.1 Load Current Balancing
    2. 4.2 Inductor Current
    3. 4.3 Thermal Images
      1. 4.3.1 Dual Phase Operation at Variable Load
      2. 4.3.2 Comparison Between Single Phase and Dual Phase Operation
  8. 5Summary
  9. 6References

5 Summary

With the results from the previous section, parallel operation using LM51772 converters can be done with a load sharing within 10% relative error. As per inductor current, a favorable synchronization between the phases can be seen with a slight variation in peak current value, which can be compensated by using a similar inductor. Additionally, the results from the thermal tests also confirm the thermal stability of the converters in a parallel fashion, but a slightly high temperature is measured for the boost region in comparison to the buck and buck-boost region. Moreover, the thermal comparison among single-phase and dual-phase operations confirms the high thermal efficiency and low losses in dual-phase operation.