TIDT299 September   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Design Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Thermal Efficiency Data
    5. 2.5 Frequency Response
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-Up Sequence
    5. 3.5 Bypass Operation

Description

This reference design is a 450-W dual-phase boost converter for automotive applications. The circuit accepts an input voltage of 6 V to 35 V, and boosts to a nominal 12-V output rail that is capable of sourcing 37.5 A of current. The design uses two synchronous boost controllers operating at a switching frequency of 450 kHz per phase. Each controller has an internal current source to keep the high-side MOSFETs on at 100% duty cycle. This ability allows for bypass operation when the input voltage is greater than the regulated output voltage.