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

6.3 Redundancy to Low Side Only

Figure 6-3 shows the low-side gate drivers are powered from both the LV and the HV battery. In this method, the LV battery is used as a main power supply, while the HV battery is used to provide the redundancy to the low-side gate drivers. On the other side, the high-side gate drivers are powered only from the LV battery. Having redundancy either to the low-side or high-side gate drivers can help to achieve one of the possible safe states (for example: active short circuit). If there is a failure at the LV battery, the low-side gate drivers are still powered from the HV battery. Compared to the previous architecture, where all gate drivers have the redundant power supply, this architecture is more cost-effective and might be sufficient to fulfill functional safety requirements.

GUID-20231228-SS0I-CVVL-FMT7-XTDTFTL6S62T-low.svgFigure 6-3 Redundancy Only at the Low Side in Fully-Distributed Architecture