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

Abstract

In many isolated power-supply applications, power MOSFETs are often arranged in some form of bridge configuration for optimization of the power switches and power transformer for greater efficiency. These bridge configurations create two classifications of switches: high-side (HS) and low-side (LS). Dedicated HS and LS gate-driver ICs, such as the UCC277xx, UCC272xx and LM510x families, offer an output for HS switches as well as an output for LS switches in a single IC.

In contrast, some applications see great benefit from using single-output gate drivers such as the UCC2753x or the isolated UCC53xx families instead of combining HS and LS into one half bridge driver. Single output drivers can be located closer to the power switches, enabling greater layout flexibility and fewer parasitics, leading to optimal switching performance.