SLVAFJ0 april   2023 TPS650340-Q1 , TPS650350-Q1 , TPS650352-Q1

 

  1.   Passing CISPR-25 Radiated and Conduction Emissions Using the TPS65035x-Q1
  2.   Trademarks
  3. 1Introduction
  4. 2Spread Spectrum
  5. 3Schematics and Printed Circuit Board (PCB) Description
    1. 3.1 Schematics
    2. 3.2 Bill of Materials
    3. 3.3 Board Layout
  6. 4Design Considerations
  7. 5Summary
  8. 6Conducted and Radiated Emission Average and Peak Plots
  9. 7References

5 Summary

The TPS65035x-Q1 device family passes the CISPR25 Class-5 Conducted and Radiated Emissions required for automotive applications. Passing results can be achieved using the integrated SSC feature combined with the design and layout considerations described in Section 3 and Section 4. The operating conditions are given in Table 5-1.

Table 5-1 Emissions Test Operating Conditions
Regulator Output Voltage (V) Output Current (mA)
Buck 1 3.3 770(1)
Buck 2 1.8 600
Buck 3 1.2 600
LDO 2.8 150
(1) The output current for Buck 1 is comprised of the input currents for Buck 2, Buck 3, and the LDO. There is no additional loading on the 3.3 V rail.