SLUA669B March   2013  – September 2023 LM5112 , LM5112-Q1 , LM5114 , LM5134 , LMG1020 , LMG1025-Q1 , SM74101 , TPS2818-EP , TPS2819-EP , TPS2828 , TPS2829 , UC1705 , UC1705-SP , UC1710 , UC2705 , UC3710 , UCC27321 , UCC27321-Q1 , UCC27322 , UCC27322-EP , UCC27322-Q1 , UCC27332-Q1 , UCC27511 , UCC27511A , UCC27511A-Q1 , UCC27512 , UCC27512-EP , UCC27516 , UCC27517 , UCC27517A , UCC27517A-Q1 , UCC27518 , UCC27518A-Q1 , UCC27519 , UCC27519A-Q1 , UCC27531 , UCC27531-Q1 , UCC27532 , UCC27532-Q1 , UCC27533 , UCC27536 , UCC27537 , UCC27538 , UCC27611 , UCC27614 , UCC27614-Q1 , UCC37321 , UCC37322 , UCC44273 , UCC57102 , UCC57102-Q1 , UCC57108 , UCC57108-Q1 , UCD7100

 

  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.