TIDT388 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 Considerations
  6. 2Testing and Results
    1. 2.1 Efficiency, Power Loss, and Load Regulation Graphs
    2. 2.2 Thermal Images
    3. 2.3 Dimensions
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transient Response
    4. 3.4 Start-Up
    5. 3.5 Overcurrent Protection
    6. 3.6 Efficiency and Power Loss Comparison of Varying Solutions

Description

This reference design utilizes two LM5148-Q1 single-phase synchronous buck controllers and four LMG3100R017 GaN FETs configured as a dual-phase, interleaved, synchronous buck converter. The converter generates a regulated 5V output capable of delivering a nominal 30A of current to the load, with a peak current capability of 60A, accepting an input voltage of between 24Vin to 60Vin (48Vin nominal). The design is built on a 6-layer PCB with 2oz copper for each of the six layers. The evaluation board measures 5.0in × 3.4in (127.00mm × 86.36mm); however, the actual converter design size measures approximately 53.5mm × 52.0mm. This board is optimized for high efficiency across the entire load current range, which is achieved by configuring the converter to run in Pulse Frequency Modulation (PFM) mode at light loads.