TIDUFK0 October   2026

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Step-Down Converter Subsystem
      2. 2.2.2 Digital-to-Analog Control Set Path
      3. 2.2.3 High-Precision Measurement Front-End (Feedback Path)
    3. 2.3 Highlighted Products
      1. 2.3.1 TPSM8F7x20
      2. 2.3.2 ADS9308V8I
      3. 2.3.3 TMDSCNCD28P65X
      4. 2.3.4 DAC80504
      5. 2.3.5 REF50
      6. 2.3.6 OPAx990
  8. 3System Design Theory
    1. 3.1 Converter Step Down Range
    2. 3.2 Fault Clamping Protection
    3. 3.3 Current Clamping Behavior
  9. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software
    3. 4.3 Test Setup
    4. 4.4 Test Results
      1. 4.4.1 Voltage Linearity test
      2. 4.4.2 Voltage Regulation Test
      3. 4.4.3 Current Linearity Test
      4. 4.4.4 Output Voltage Ripple
      5. 4.4.5 Full Load Transient Response
      6. 4.4.6 Sudden Load Switch In with Current Clamping Response
      7. 4.4.7 Full Load Voltage Settling Time
  10. 5Design and Documentation Support
    1. 5.1 Tools and Software
      1. 5.1.1 Tools
      2. 5.1.2 Software
    2. 5.2 Documentation Support
    3. 5.3 Support Resources
    4.     Trademarks
  11. 6About the Author

2.2.3 High-Precision Measurement Front-End (Feedback Path)

Tracking load conditions to maintain a 0.005% regulation target requires telemetry that bypasses thermal drifting. The system routes point-of-load voltage sensing and high-side current shunt drops directly into the ADS9308V8I 24-Bit ADC.

  • Voltage Sensing: Low-drift differential difference amplifiers attenuate and buffer the rail voltages directly from the DUT socket pins.
  • Current Sensing: Integrated zero-drift programmable gain amplifiers (PGAs) amplify forward voltage drops across precision shunts without introducing offset errors.

Because the ADC samples all 16 channels simultaneously at 125kSPS, the C2000 MCU receives real-time phase-aligned measurements. The MCU processes these data vectors through a digital proportional-integral (PI) algorithm, calculating adjustment commands sent directly to the power conversion components to instantly neutralize any load or line fluctuations, maintaining rapid transition from constant voltage (CV) to constant current (CC) forward current limiting modes during a fault event.