SLUA887A August   2018  – September 2023 UCC27710 , UCC27712 , UCC27714

 

  1.   1
  2.   Bootstrap Circuitry Selection for Half-Bridge Configurations
  3.   Trademarks
  4. 1Introduction
  5. 2Basic Operation of Bootstrap Circuit
  6. 3Bootstrap Components Selection
    1. 3.1 Bootstrap Capacitor
    2.     8
    3. 3.2 VDD Bypass Capacitor
    4. 3.3 External Bootstrap Diode
    5.     11
    6. 3.4 Bootstrap Resistor
    7.     13
  7. 4Layout Considerations for Bootstrap Components
  8. 5Summary
  9. 6References
  10. 7Revision History

5 Summary

This application report used UCC27710, TI's 600V family of half-bridge drivers to discuss the basic operation of a bootstrap circuit in a half-bridge configuration. It also discussed the role and importance of each bootstrap components required to generate bias for the high-side FET in half-bridge configurations. It showed a detailed calculation method as well as a general rule of thumb estimation for the bootstrap capacitor. Additionally, it discussed how to properly place these components on a PCB layout once all the components are appropriately selected.