SLUAAV9 March   2024 LM76003 , UCC27201A , UCC27282 , UCC27288

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Design and Potential Risk in Certain Application Scenario
  6. 3Analysis of Potential Problem
    1. 3.1 High Duty Cycle Causes High Current Stress in Bootstrap Diode
      1. 3.1.1 Mode 1
      2. 3.1.2 Mode 2
      3. 3.1.3 Mode 3
      4. 3.1.4 Mode 4
    2. 3.2 Influence by the Extra Voltage Source
  7. 4Design Recommendation
  8. 5Summary
  9. 6References

5 Summary

This application note provides an easy implemented design to drive high side FET with 100% duty cycle using half-bridge gate driver. This design only needs an extra power supply connected to a gate driver. The operation principle with or without extra power supply are analyzed. Furthermore, the potential risks that can occur in some certain application scenarios are also analyzed. A clear explanation and design consideration to this design are given and simulation and experiments are utilized to verify the theory.