SLUAAL3 July   2022 UCC28C50-Q1 , UCC28C51-Q1 , UCC28C52-Q1 , UCC28C53-Q1 , UCC28C54-Q1 , UCC28C55-Q1 , UCC28C56H-Q1 , UCC28C56L-Q1 , UCC28C57H-Q1 , UCC28C57L-Q1 , UCC28C59-Q1


  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Operating Voltage of the Switching Device
  5. 3Start-Up Circuitry and Comparisons
  6. 4Current Filtering, Leading-Edge Blanking, and Slope Compensation
  7. 5High Voltage Isolation
  8. 6Summary
  9. 7Related Documentation


A high-voltage to low-voltage backup auxiliary power supply has become prevalent in automotive powertrain applications. This application report discusses key considerations and design guidelines for the backup power supply such as the operating voltage of the switching device, startup circuitry, noise coupling, and high-voltage isolation.