SNLA224B June   2014  – October 2025 DS90UB913A-Q1 , DS90UB954-Q1 , DS90UB960-Q1 , DS90UB9702-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Theory of Operation for Power Over Coax
    1. 2.1 Inductor Characteristics
    2. 2.2 Capacitor Characteristics
    3. 2.3 Inductors versus Ferrite Beads
  6. 3Design Considerations
    1. 3.1 Frequency Range
    2. 3.2 Power Considerations
    3. 3.3 Resistance Considerations
    4. 3.4 Inductor Size Considerations
    5. 3.5 Layout Considerations
  7. 4FPD-Link PoC Requirements
    1. 4.1 Channel Requirements
  8. 5PoC Noise
    1. 5.1 PoC Noise Requirements
    2. 5.2 Measuring VPoC Noise and Pulse
      1. 5.2.1 Requirements
      2. 5.2.2 Measurement Procedure
    3. 5.3 Measuring RIN+ Noise
      1. 5.3.1 Requirements
      2. 5.3.2 Measurement Procedures
    4. 5.4 Causes of PoC Noise
    5. 5.5 Noise Measurement Best Practices
    6. 5.6 Reducing Effects of PoC Noise
  9. 6TI Reviewed PoC Networks
    1. 6.1 PoC Network from FPD-Link III Data Sheet
    2. 6.2 Murata FPD3 Networks
      1. 6.2.1 Murata FPD3 Design 1
      2. 6.2.2 Murata FPD3 Design 2
      3. 6.2.3 Murata FPD3 Design 3
      4. 6.2.4 Murata FPD3 Design 4
      5. 6.2.5 Murata FPD3 Design 5
      6. 6.2.6 Murata FPD3 Design 6
    3. 6.3 TDK FPD3 Networks
      1. 6.3.1 TDK FPD3 Design 1
      2. 6.3.2 TDK FPD3 Design 2
      3. 6.3.3 TDK FPD3 Design 3
      4. 6.3.4 TDK FPD3 Design 4
      5. 6.3.5 TDK FPD3 Design 5
      6. 6.3.6 TDK FPD3 Design 6
      7. 6.3.7 TDK FPD3 Design 7
      8. 6.3.8 TDK FPD3 Design 8
    4. 6.4 Coilcraft FPD3 Networks
      1. 6.4.1 Coilcraft FPD3 Design 1
      2. 6.4.2 Coilcraft FPD3 Design 2
      3. 6.4.3 Coilcraft FPD3 Design 3
      4. 6.4.4 Coilcraft FPD3 Design 4
      5. 6.4.5 Coilcraft FPD3 Design 5
      6. 6.4.6 Coilcraft FPD3 Design 6
      7. 6.4.7 Coilcraft FPD3 Design 7
      8. 6.4.8 Coilcraft FPD3 Design 8
      9. 6.4.9 Coilcraft FPD3 Design 9
    5. 6.5 Murata FPD4 Networks
      1. 6.5.1  Design 1
      2. 6.5.2  Design 2
      3. 6.5.3  Design 3
      4. 6.5.4  Design 4
      5. 6.5.5  Design 5
      6. 6.5.6  Design 6
      7. 6.5.7  Design 7
      8. 6.5.8  Design 8
      9. 6.5.9  Design 9
      10. 6.5.10 Design 10
      11. 6.5.11 Design 11
      12. 6.5.12 Design 12
      13. 6.5.13 Design 13
      14. 6.5.14 Design 14
      15. 6.5.15 Design 15
      16. 6.5.16 Design 16
      17. 6.5.17 Design 17
      18. 6.5.18 Design 18
      19. 6.5.19 Design 19
      20. 6.5.20 Design 20
      21. 6.5.21 Design 21
      22. 6.5.22 Design 22
      23. 6.5.23 Design 23
      24. 6.5.24 Design 24
      25. 6.5.25 Design 25
      26. 6.5.26 Design 26
      27. 6.5.27 Design 27
      28. 6.5.28 Design 28
      29. 6.5.29 Design 29
    6. 6.6 TDK FPD4 Networks
      1. 6.6.1  Design 1
      2. 6.6.2  Design 2
      3. 6.6.3  Design 3
      4. 6.6.4  Design 4
      5. 6.6.5  Design 5
      6. 6.6.6  Design 6
      7. 6.6.7  Design 7
      8. 6.6.8  Design 8
      9. 6.6.9  Design 9
      10. 6.6.10 Design 10
      11. 6.6.11 Design 11
      12. 6.6.12 Design 12
      13. 6.6.13 Design 13
      14. 6.6.14 Design 14
      15. 6.6.15 Design 15
      16. 6.6.16 Design 16
      17. 6.6.17 Design 17
      18. 6.6.18 Design 18
      19. 6.6.19 Design 19
      20. 6.6.20 Design 20
      21. 6.6.21 Design 21
      22. 6.6.22 Design 22
      23. 6.6.23 Design 23
    7. 6.7 Coilcraft FPD4 Networks
      1. 6.7.1  Design 1
      2. 6.7.2  Design 2
      3. 6.7.3  Design 3
      4. 6.7.4  Design 4
      5. 6.7.5  Design 5
      6. 6.7.6  Design 6
      7. 6.7.7  Design 7
      8. 6.7.8  Design 8
      9. 6.7.9  Design 9
      10. 6.7.10 Design 10
      11. 6.7.11 Design 11
      12. 6.7.12 Design 12
      13. 6.7.13 Design 13
      14. 6.7.14 Design 14
      15. 6.7.15 Design 15
  10. 7Summary
  11. 8References
  12. 9Revision History

3.4 Inductor Size Considerations

Although not required for functionality, some systems have size constraints that must be considered when designing a PoC network. The values of the inductors used are based on the impedance and filtering needs of the system, but the physical size of the inductors is dependent on the ability of the device core to sustain the magnetic field. Physically smaller inductors have lower saturation currents and limit the current rating of the PoC network. One way to safely use an inductor with a lower saturation current is to reduce the current requirement of the circuit by increasing the voltage being carried by the coax cable. For example, if the camera or sensor requires 1.5W and a PoC voltage of 5V is used, a current of 300 mA must be supported. However, if a PoC voltage of 12V is used, a current of only 125mA must be supported. The lower current requirement allows for an inductor with a lower saturation current and potentially smaller footprint to be used.