SLVAF16A March   2021  – December 2021 AFE7920 , AFE7950 , TPS541620 , TPS62912 , TPS62913

 

  1.   Trademarks
  2. 1Introduction and System Description
    1. 1.1 Introduction
      1. 1.1.1 AFE79xx Noise and Ripple Requirements
      2. 1.1.2 TPS62913 Low-Noise and Low-Ripple Buck Converter
      3. 1.1.3 TPS541620 Dual 6A Converter
    2. 1.2 Block Diagram
    3. 1.3 Design Considerations
  3. 2Tests and Results
    1. 2.1 Test Methodology
    2. 2.2 Test Conditions
    3. 2.3 Test Results
  4. 3Schematic
  5. 4Conclusion
  6. 5References
  7. 6Revision History

4 Conclusion

As shown by the test results, a simplified power supply design using the TPS62913 low-ripple and low-noise buck converters can provide similar performance to the traditional DC-DC converter + LDO approach. The 1.8 V rails are all supplied using the TPS62913 switching regulator without the need for a low-dropout linear regulator (LDO) while maintaining the same performance as the original design. The performance is similar to the DC-DC converter + LDO approach. Use of the TPS62913 design reduces the power consumption by 1.24 W for the 1.8 V rails, reduces the size of the design, and reduces the temperature rise of the power supply components.

Although this design used the AFE7920, other AFEs that require low noise power supplies that are size constrained and thermal constrained can also use this approach.