TIDT380 February   2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Dimensions
  6. 2Testing and Results
    1. 2.1 Thermal Images
    2. 2.2 Bode Plots
  7. 3Waveforms
    1. 3.1 Cold Crank
    2. 3.2 Start-up
    3. 3.3 Steady State
    4. 3.4 Short-Circuit Protection
    5. 3.5 Load Transients

Description

This reference design demonstrates a power supply system for infotainment display modules with common system requirements like cold crank, load dump, and Automotive Safety Integrity Level (ASIL). The LM74900-Q1 is the first stage of the design playing a role of protection for negative input voltage, undervoltage, locked output, and overcurrent protection. The LM5152-Q1 is the second stage to function as pre-boost controller which can boost up to a specific voltage if battery voltage is low when starting up. The device supports battery voltages down to 4.2V and 100W power output. At the third stage, the design uses LMQ644A2-Q1, TPS62813-Q1, and TPS745-Q1 to provide the desired voltage to the subsystem like local dimming backlight, TCON, and SerDes. Lastly the design uses voltage monitors to monitor each rail and to aid ISO 26262 system design to achieve the targeted ASIL.