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

3.3 Load Transient Test

Figure 3-7 shows the load transient response of the power supply. The load of 25 mA per rail is applied onto both positive and negative rail with a duty cycle 20% at pulse repetition frequency of 5 kHz, as shown in purple waveform. A drop of less than 50 mV is observed on both the rails. Moreover, the load transient response test is repeated in case the load of the power supply is 1 A per rail with a duty cycle of 1%, at pulse repetition frequency of 5 kHz. The result in Figure 3-8, shows a drop of less than 1 V per rail.

GUID-A7D68B9F-8B02-4D61-B083-5E9C8CD434B6-low.pngFigure 3-7 Load Transient Response of Positive and Negative Output Rail With Symmetrical Loads (25 mA)
GUID-8E69BFE7-4FB1-42E4-9F60-C86D07F06110-low.pngFigure 3-8 Load Transient Response of Positive and Negative Output Rail With Symmetrical Loads (1A)