SLUA669B March   2013  – September 2023 UCC27511 , UCC27531 , UCC27532 , UCC27533 , UCC27536 , UCC27537 , UCC27538

 

  1.   1
  2.   Using a Single-Output Gate-Driver for High-Side or Low-Side Drive
  3.   Trademarks
  4. 1Introduction
  5. 2Methods For High-Side Drive
    1. 2.1 Gate-Drive Transformer Solution
    2. 2.2 Bootstrap Bias Supply with Capacitive Signal Isolation Solution
    3. 2.3 Isolated Bias Supply With Isolated High-Side Gate-Driver Solution
    4. 2.4 Bootstrap Bias Supply with Isolated High/Low side Gate-Driver Solution
    5. 2.5 Gate-Drive Transformer Solution
  6. 3Conclusion
  7. 4 Revision History

2.4 Bootstrap Bias Supply with Isolated High/Low side Gate-Driver Solution

GUID-1EBAEE6B-9643-4130-9AF0-3FE1FFD5CF68-low.gifFigure 2-4 Isolated Drivers Using High-Side Bootstrap Circuit

Signal Isolation

The input signals of U1 are isolated in Figure 2-4, with the isolated gate driver, UCC53xx. This allows the signal to operate properly, even as the signal reference (switch-node) changes voltage throughout the switching period. It also isolates the controller ground from the switch-node and power ground.

High-Side Bias

In Figure 2-4, Dboot and Cboot are used as a bootstrap circuit to bias U1 properly. In the UCC27712 datasheet, refer to for selecting Cboot and for selecting Dboot.