STDA010 January   2026 LM25180-Q1 , LM5155-Q1 , SN6507-Q1 , UCC14240-Q1 , UCC34141-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Low-Voltage Isolated Bias Power Supply
    2. 1.2 High-Voltage Bias Power Supply
  5. 2Bias Power in Common-Source Configuration of Back-to-Back FETs
  6. 3Bias Power in Common Drain Configuration of Back-to-Back and Bidirectional FETs
    1. 3.1 Centralized Isolated Bias Power Supply Architecture
    2. 3.2 Semi-Distributed Isolated Bias Power Supply Architecture
    3. 3.3 Bias Power Supply Using a DC-DC Converter Module
  7. 4Isolated Bias Power Supply Using Gate Driver to Drive the Transformer
  8. 5Redundancy in the Isolated Bias Power Supply Architecture
  9. 6Summary
  10. 7Terminology

4 Isolated Bias Power Supply Using Gate Driver to Drive the Transformer

For isolated bias power supply generation, a gate driver can drive the transformer (typically, a low-side gate driver like UCC27624-Q1). In this approach, an additional device, like a clock, microcontroller, or so forth, generates PWM signals of a certain duty cycle, which then drives the transformer to generate isolated bias power. However, the architectures mentioned earlier in this paper are specifically targeted for isolated bias power supply applications, and these architectures are preferred compared to the approach using a gate driver to drive a transformer for isolated bias power supply generation.

The following devices can be used as the preferred choice for a PWM generator and non-isolated gate driver to drive a transformer to generate isolated bias power for an isolated gate driver: