SLVAFE7 September   2022 LM51551

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Design Specification and Key Challenges
  4. 2High-Voltage Power Supply Design Using SEPIC
    1. 2.1 TI HV Supply Architecture Using SEPIC Topology
    2. 2.2 Switching Frequency Shift
    3. 2.3 Voltage Control by External Signal
  5. 3Test Result
    1. 3.1 Efficiency and Power Consumption (100 kHz vs 250 kHz)
    2. 3.2 Linearity of Output Voltages vs VBIAS
    3. 3.3 Output Ripple Measurement
    4. 3.4 Load Transient Test
    5. 3.5 Overload Protection
    6. 3.6 Thermal Image
  6. 4Summary
  7. 5References

4 Summary

The smart probe is a new trend for the next generation of portable ultrasound equipment. The handheld size of a smart probe provides convenience for doctors, but consumes more power. Due to the working process of the transmitter, the controller of the power supply does not always need to switch fast. By slowing down the switching frequency during the no load period, the quiescent loss decreases significantly. This decrease extends the battery life and improves the thermal performance. The adjustable output helps meet a variety of requirements of the customer and eases the methods for powering the transmitter. These features help simplify the system design.