TIDT345 September   2023

 

  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 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-Up Sequence

2.3 Thermal Images

Figure 3-29 shows a thermal image of the top view of the board. Ambient temperature is 22.5°C. The board is open frame with no active air flow. Input is 48 V and output is loaded with 20 V and 3 A at VBUS for 30 minutes.

GUID-20230731-SS0I-PXSQ-S3M7-H0HW4VP6FDRN-low.jpg
Bx1 = L1 – 20-V buck inductor
Bx2 = U1 – 20-V buck converter
Bx3 = U2 – 3.3-V buck converter
Bx4 = U4 – PD controller
Bx5 = L2 – 3.3-V buck inductor
Figure 2-4 Thermal Image