TIDUFH6 May   2026

 

  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 48V Smart Actuator Architectures
        1. 2.2.1.1 48V Distribution Architecture
        2. 2.2.1.2 48V and 12V Distribution Architecture
        3. 2.2.1.3 48V and 12V Supplies Architecture
        4. 2.2.1.4 Reference Design Architecture
      2. 2.2.2 Low Power Sleep Mode Architecture
      3. 2.2.3 Bulk Capacitance Estimation
      4. 2.2.4 EMI PI Filter
      5. 2.2.5 Reverse Polarity Protection
      6. 2.2.6 LIN Bus Fault Voltage for 48V Architecture
    3. 2.3 Highlighted Products
      1. 2.3.1 TLIN4029A-Q1
      2. 2.3.2 MSPM0G3507-Q1
      3. 2.3.3 DRV8363-Q1
      4. 2.3.4 LM5168P-Q1
      5. 2.3.5 TPS7B81-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Reference Design Hardware and Programming Setup
    2. 3.2 Software
    3. 3.3 Test Setup
    4. 3.4 Test Results
      1. 3.4.1 LIN Remote Wake-Up Timing Analysis
        1. 3.4.1.1 Test Setup
        2. 3.4.1.2 Test Results
      2. 3.4.2 System Sleep Current Analysis
        1. 3.4.2.1 Test Setup
        2. 3.4.2.2 Test Results
      3. 3.4.3 DC Link Voltage Ripple
        1. 3.4.3.1 Test Setup
        2. 3.4.3.2 Test Results
      4. 3.4.4 Thermal Images
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 PCB Layout Recommendations
        1. 4.1.3.1 Layout Prints
        2. 4.1.3.2 Gerber Files
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5.     Trademarks
  11. 5About the Author

2.2.1.2 48V and 12V Distribution Architecture

TIDA-020101 48V and 12V Distribution Architecture Figure 2-5 48V and 12V Distribution Architecture

This intermediate approach distributes both 48V and 12V power to the smart actuators, requiring three to four wires (48V, 12V, LIN, GND) as shown in Figure 2-5. The upper ECU contains both 48V and 12V high-side switches, adding complexity to the power distribution system.

Key characteristics include:

  • Moderate wiring complexity
  • Potential for 48V LIN bus faults
  • System faults include shorts between 48V and LIN, and shorts between 48V and 12V