TIDUFA5 December   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Small Compact Size
      2. 2.2.2 Transformerless Design
    3. 2.3 Highlighted Products
      1. 2.3.1  BQ25790 IIC Controlled, 1–4 Cell, 5A Buck-Boost Battery Charger
      2. 2.3.2  TPS3422 Low-Power, Push-Button Controllers With Configurable Delay
      3. 2.3.3  SN74LVC1G74 Single Positive-Edge-Triggered D-Type Flip-Flop With Clear and Preset
      4. 2.3.4  TPS259470 2.7V–23V, 5.5A, 28mΩ True Reverse Current Blocking eFuse
      5. 2.3.5  TPS54218 2.95V to 6V Input, 2A Synchronous Step-Down SWIFT Converter
      6. 2.3.6  TPS54318 2.95V to 6V Input, 3A Synchronous Step-Down SWIFT Converter
      7. 2.3.7  LM5158 2.2MHz, Wide VIN, 85V Output Boost, SEPIC, or Flyback Converter
      8. 2.3.8  TPS61178 20V Fully Integrated Sync Boost With Load Disconnect
      9. 2.3.9  LMZM23601 36V, 1A Step-Down DC-DC Power Module in 3.8mm × 3mm Package
      10. 2.3.10 TPS7A39 Dual, 150mA, Wide-VIN, Positive and Negative Low-Dropout (LDO) Voltage Regulator
      11. 2.3.11 TPS74401 3.0A, Ultra-LDO With Programmable Soft Start
      12. 2.3.12 TPS7A96 2A, Ultra-Low Noise, Ultra-high PSRR RF Voltage Regulator
      13. 2.3.13 LM3880 3-Rail Simple Power Sequencer With Fixed Time Delay
      14. 2.3.14 DAC53401 10-Bit, Voltage-Output DAC With Nonvolatile Memory
      15. 2.3.15 INA231 28V, 16-bit, I2C Output Current, Voltage, and Power Monitor With Alert in WCSP
  9. 3System Design Theory
    1. 3.1 Input Section
      1. 3.1.1 Buck-Boost Charger
      2. 3.1.2 Power On or Off
    2. 3.2 Designing SEPIC and Cuk Based High-Voltage Power Supply
      1. 3.2.1 Basic Operation Principle of SEPIC and Cuk Converters
      2. 3.2.2 Dual High-Voltage Power Supply Design Using Uncoupled Inductors With SEPIC and Cuk
        1. 3.2.2.1 Duty Cycle
        2. 3.2.2.2 Inductor Selection
        3. 3.2.2.3 Power MOSFET Verification
        4. 3.2.2.4 Output Diode Selection
        5. 3.2.2.5 Coupling Capacitor Selection
        6. 3.2.2.6 Output Capacitor Selection
        7. 3.2.2.7 Input Capacitor Selection
        8. 3.2.2.8 Programming the Output Voltage With Adjustable function
    3. 3.3 Designing the Low-Voltage Power Supply
      1. 3.3.1 Designing the TPS54218 Through WEBENCH Power Designer
      2. 3.3.2 ±5V Transmit Supply Generation
    4. 3.4 System Clock Synchronization
    5. 3.5 Power and Data Output Connector
    6. 3.6 System Current and Power Monitoring
  10. 4Hardware, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Test Setup
    3. 4.3 Test Results
      1. 4.3.1 Efficiency Test Result
      2. 4.3.2 Line Regulation Testing Result
      3. 4.3.3 Spectrum Test Result
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
        1. 5.1.3.1 High-Voltage Supply Layout
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks

2.2.1 Small Compact Size

The size of the complete design is kept in a handheld form factor. The design includes:

  • The transmit circuit with transducers. The design employs a 128-channel transmitter with the two newest 64-channel ultrasound transmitters in the industry.
  • 64-channel receive
  • High-performance FPGA for beamforming
  • High-voltage circuit for transmit power
  • Eight independent low-voltage rails to deliver point-of-load power and USB and data capture section to power and transfer the received data to the PC or tablet

All of these sections are placed on a two-board assembly with TX, RX, and FPGA on one and the remainder is on the Power Board discussed in this design. Figure 2-4 shows the height distribution of the complete system. The total height of the design is < 20mm. Figure 2-4 also shows the corresponding real image of the implemented design.

TIDA-010269 Total Height of the Complete DesignFigure 2-4 Total Height of the Complete Design