TIDT279 October   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Power and Load Connections and Test Points
    2. 1.2 Voltage and Current Requirements
    3. 1.3 Required Equipment
    4. 1.4 Considerations
    5. 1.5 Board Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency and Loss Graphs
    2. 2.2 Thermal Images
    3. 2.3 Bode Plots
    4. 2.4 Conducted Emissions vs CISPR Class 5
  6. 3Waveforms
    1. 3.1 Output Voltage Ripple
    2. 3.2 Load Transients
    3. 3.3 Start-Up of Each Independently-Controlled Output

Description

This reference design provides power for automotive advanced driver-assistance systems (ADAS) to power the cameras (8 V), controller area network CAN communications (5 V), and main processor (3.3 V). Operation is over the full automotive range including battery voltage surges to 34 V and dips to 6 V due to cold cranking. The design is low-noise to meet the stringent CISPR 25 Class 5 emissions requirements and includes an input filter. The board is designed for easy testing, providing jumpers to disable each output and an onboard dynamic load for the high-current 3.3-V output. The test report includes operational data on each output, and conducted emissions scans for the complete design against CISPR 25 Class 5.