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

7 Summary

The rapid evolution of ultrasound smart probes is changing the medical landscape and is helping provide better healthcare in remote places. The advent of these handheld devices is coming with the big challenges of compact size, high noise immunity, efficiency and thermal performance. This design, by the selection of SEPIC topology over the traditional transformer-based flyback topology, helps in solving some key- challenges for generating high voltage from low input voltage, in the desired size and height, while maintaining a high efficiency, low noise, good load regulation and symmetry. Based on the voltage requirement of the ultrasound transducer and operating modes, the output of high voltage circuit supports programmability.