SLLA334B August   2018  – September 2022 ISO1050 , SN6501

 

  1.   Isolated CAN Solution by Using ISO1050 and SN6501
  2.   Trademarks
  3. 1Introduction
  4. 2Capacitive Isolation Technology
  5. 3Isolated CAN Module Design
    1. 3.1 Transformer Driver
    2. 3.2 5-V to 5-V Isolated Power Design Consideration
    3. 3.3 PCB Design
  6. 4Experiment Validation
  7. 5Conclusion
  8. 6References
  9. 7Revision History

3 Isolated CAN Module Design

For the isolated CAN design, both power supply and signal path must be electrically isolated to meet a certain isolation level. Because ISO1050 is already internal galvanically isolated for signal path, designing a robust isolated power supply is the key design consideration for the entire module. For a common design, isolated power that is glue-poured as a module is always used for convenience (for example, DCR010505, which is a 1-W isolated 5-V to 5-V, DC-DC converter). However, using such a ready-made power module occupies more PCB room and is not suitable in some cost-sensitive cases. A PCB-level discrete solution can also be implemented by using DC-DC converter such as TPS61085; approximately 20 external components, including transformer and diodes, are required. This kind solution is too complicated to design the isolated power supply for a small package-isolated CAN module.