SLVAFK5A December   2023  – February 2024 LM5177

 

  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
  10. 7Revision History

Abstract

The synchronous 4-switch buck-boost controller LM5177 operates over a wide input voltage range and can support battery backup systems, solar power, industrial personal computers (IPCs), and many other applications. LM5177 produces a regulated output voltage at, above, or below the input voltage. Paralleling two or more LM5177 converters is an attractive way to support a higher power level. This application note shows how this can be done to achieve well-balanced load sharing between the paralleled converters within a 10% error. Design guidelines are given to help readers to design properly for practical applications.