TIDUFC2 April   2025

 

  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 High-Voltage Generator Circuit
      2. 2.2.2 Low-Voltage Switching Mode Power Supply
      3. 2.2.3 Sitara™ MCU AM2431 Reset and Power Rail Monitoring Circuit
      4. 2.2.4 Clock Generator
      5. 2.2.5 CMOS to LVDS Driver
      6. 2.2.6 Layout Guidance
    3. 2.3 Highlighted Products
      1. 2.3.1 TX7516
      2. 2.3.2 TMU9832
      3. 2.3.3 AM2431
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 TIDA-010256 PCB Overview
      2. 3.1.2 TIDA-010256 Connector Settings
    2. 3.2 Software Requirements
    3. 3.3 Test Setup
    4. 3.4 Test Results
      1. 3.4.1 High-Voltage Power Supply Output Ripple
      2. 3.4.2 Output Waveform
      3. 3.4.3 Thermal Test
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks

2.1 Block Diagram

Figure 2-1 shows the overall system block diagram.

TIDA-010256 TIDA-010256 Overall System Block DiagramFigure 2-1 TIDA-010256 Overall System Block Diagram

Low voltage power supply (LVPS) is mainly used in microcontrollers, FPGA, digital IO, and analog power supply in ultrasound systems. TI proposes using modules in low-power supply designs for reduced noise, compact size, high efficiency, easy design, low cost, and rapid manufacturing.

TI recommended using TPS63603 module, which offers low noise and high efficiency, converting 12V bus voltage to ±5.5V, 3.3V. For the low voltage supplies for TX7516 and TMUX9832 analog rail, each DC/DC covert is followed by a low noise LDO TPS7A9401 to remove power noise to achieve higher PSRR. In terms of MCU, FPGA core are powered by TPS62932, TLV75518.

TI offers several high-voltage power supply topologies for different ultrasound systems. In handheld or portable ultrasound where the SEPIC and CUK combined high-voltage topologies are designed for those application scenarios due to high efficiency at light load and overall smaller size. In this design, LM5155 non-synchronous boost controller to drive external metal-oxide semiconductor field-effect transistor (MOSFET) to provide four channel high-voltage power output and an external high-voltage input interface is reserved for powering the TX7516 during shear wave elastography tests at high load.

Phase shift (frequency domain) and jitter (time domain) of the clock signal are key parameters that affect ultrasound imaging quality and high phase noise can often cause image artifacts. This is why the design uses high-performance, low-jitter, standard oscillator LMK62A2 (LMK62D recommended for new designs) and ultra-low-jitter buffer LMK00304 provides a low jitter, high quality clock signal to TX7516.

The TMUX output is required to be connected to the load network through board-to-board connectors, the load is in the form of a 220Ω resistor and a 220pF capacitor in parallel.