SLVA833D October   2016  – May 2021 TPS2660 , TPS2662 , TPS2663

 

  1.   Trademarks
  2. 1 Surge Test (IEC 61000-4-5)
  3. 2 EFuse Solution for Surge Protection
  4. 3 EFuse Solution Schematic for Surge Protection
  5. 4 Circuit Performance for Surge Tests
  6. 5 EFT Test (IEC 61000-4-4)
  7. 6 EFuse Solution Schematic for EFT protection
  8. 7 Circuit Performance for EFT Tests
  9. 8 Power-Fail Test (IEC 61000-4-29)
  10. 9 EFuse Solution Schematic for Power-Fail Applications
  11. 10Circuit Performance for Power-Fail Tests
  12. 11EFT, Surge and Power-Fail Test Setup
  13. 12Conclusion
  14. 13References
  15. 14Revision History

10 Circuit Performance for Power-Fail Tests

Figure 10-1 shows the performance of the TPS2660 for 10 ms supply interruption. During power-fail, the output bulk capacitor supplies the system load. When supply voltage resumes, the TPS2660 charges the output capacitance with the current limit.

GUID-00277754-FAE8-4769-9266-D33B3F5F9297-low.png Figure 10-1 10 ms Input Power-Fail at VIN = 24 V, Load = 24 Ω (IEC 61000-4-29 Level -1)

Figure 10-2 shows the startup of the TPS2660 when the supply voltage is ramped up. The circuit limits charging current to the bulk capacitor and simultaneously provides the required load current.

GUID-B67FC138-7C75-4FFE-ABA0-67A760AA4BD4-low.png Figure 10-2 Startup With VIN = 24 V and Load = 48 Ω