SLVAFP1 February   2024 TPS54KB20

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Butterfly Footprint Analysis
    1. 2.1 Efficiency
    2. 2.2 Thermal Performance
  6. 3Symmetrical Footprint
  7. 4Asymmetrical Footprint
  8. 5Test Data
  9. 6Summary
  10. 7References

Test Data

The experimental data below displays a waveform comparison between the two footprints, showing SW-node and VIN-SW signals. The data is measured at 12V Vin, 3.3V Vout, 25A load, and internal VCC.

GUID-20231121-SS0I-MT6P-WS60-JCJXNCMNHDZ1-low.png Figure 5-1 Symmetrical Footprint SW-Node and VIN-SW
GUID-20240205-SS0I-7XQM-WMFV-43D3S3NZJFT6-low.png Figure 5-2 Asymmetrical Footprint SW-Node and VIN-SW

Symmetrical bench data, Figure 5-1, and Asymmetrical bench data, Figure 5-2, are compared to reflect the difference in SW-node ringing when tested under identical parameters.

Figure 5-3 compares efficiency data between the symmetrical and asymmetrical layout.

GUID-20240202-SS0I-QFPP-HGK9-37W1ZM2LLFTN-low.svg Figure 5-3 Efficiency (Vin = 12V, 800 kHz FCCM)