SLUAAS4 January   2024 LM5155-Q1 , LM51551-Q1 , LM5156-Q1 , LM51561-Q1 , LM51561H-Q1 , LM5156H-Q1 , LM5157-Q1 , LM51571-Q1 , LM5158-Q1 , LM51581-Q1 , UCC28700-Q1 , UCC28730-Q1 , UCC28740-Q1 , UCC28781-Q1 , UCC28C50-Q1 , UCC28C51-Q1 , UCC28C52-Q1 , UCC28C53-Q1 , UCC28C54-Q1 , UCC28C55-Q1 , UCC28C56H-Q1 , UCC28C56L-Q1 , UCC28C57H-Q1 , UCC28C57L-Q1 , UCC28C58-Q1 , UCC28C59-Q1

 

  1.   1
  2.   Abstract
  3. 1Introduction
    1. 1.1 Low-Voltage Isolated Bias Power Supply
    2. 1.2 High-Voltage Isolated Bias Power Supply
  4. 2Pre-Regulator Requirement
    1. 2.1 Pre-Regulator at Low-Voltage Battery
      1. 2.1.1 Single Pre-Regulators Architecture
      2. 2.1.2 Multiple Pre-Regulators Architecture
    2. 2.2 Pre-Regulator From High-Voltage Battery
  5. 3Fully-Distributed Architecture
  6. 4Semi-Distributed Architecture
  7. 5Centralized Architecture
  8. 6Redundancy in Isolated Bias Power Supply Architectures
    1. 6.1 No Redundancy
    2. 6.2 Redundancy to all Devices
    3. 6.3 Redundancy to Low Side Only
    4. 6.4 Redundancy to High Side Only
  9. 7Summary
  10. 8Terminology

2.1 Pre-Regulator at Low-Voltage Battery

With a 12V LV battery, the converters most commonly used as pre-regulators are single-ended primary-inductor converter (SEPIC), buck-boost converters, and flyback converters. These converters work for a wide input voltage range and provide a stable output voltage as an input to the isolated bias power supply devices. Quite often along with isolated bias power supply for gate drivers, the output voltage rail of these pre-regulators are also used to supply other parts of the system like sensors, communication devices, and so forth.