SLOA284A january   2020  – may 2023 AFE5832 , AFE5832LP , ISO7741 , ISOW7841 , LM25037 , LM25180 , LM5180 , LM5181 , LM5181-Q1 , TX7316 , TX7332

 

  1.   1
  2.   Designing Bipolar High Voltage SEPIC Supply for Ultrasound Smart Probe
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Key Design Challenges
    2. 1.2 Potential Topologies for Generating High Voltage Supply
  5. 2Design of high voltage circuit using SEPIC topology
    1. 2.1 TI HV Supply Architecture Using SEPIC Topology
  6. 3Test Results
    1. 3.1 Efficiency and Load Regulation
    2. 3.2 Output Ripple Measurement
    3. 3.3 Load Transient Test
    4. 3.4 Noise Measurement
    5. 3.5 Thermal Performance
  7. 4Possible Variants of the Design
    1. 4.1 Option 1: Programmable Output Voltage
    2. 4.2 Option 2: Support Input From 1S Li-Ion Battery
    3. 4.3 Option 3: Output Voltage Up to ±100 V
  8. 5Layout Guidelines
  9. 6Clock Synchronization
  10. 7Summary
  11. 8References
  12. 9Revision History

3.4 Noise Measurement

Figure 3-9 and Figure 3-10 show the FFT of the received data collected from TX + RX setup consisting of TX7332 as transmit device and AFE5832LP as receive device. Figure 3-9 shows the noise with ideal bench supply and Figure 3-10 shows the noise with High Voltage supply generated by this design. The SNR in case of bench power supply and SEPIC based supply are 55.297 dB & 55.264 dB, respectively. This demonstrates that the noise performance of this design is comparable with the bench power supply.

GUID-79233DBB-C001-483E-815C-20585891E7CC-low.pngFigure 3-9 FFT of the Received Data Using Bench Power Supply, Showing SNR of 55.297 dB
GUID-08F4B0F9-B90A-4CCD-B5C2-5900C9838E7C-low.pngFigure 3-10 11 FFT of the Received Data Using SEPIC Power Supply, Showing SNR of 55.264 dB