TIDT427A December   2025  – April 2025

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Dimensions
    3. 1.3 Considerations
  6. 2Testing and Results
    1. 2.1 Efficiency Graph
    2. 2.2 Efficiency Data
      1. 2.2.1 30V Input Voltage
      2. 2.2.2 48V Input Voltage
      3. 2.2.3 60V Input Voltage
    3. 2.3 Thermal Images
      1. 2.3.1 Thermal Images at 48VIN, 12VOUT, 10A, No Heatsink
      2. 2.3.2 Thermal Images at 48VIN, 12VOUT, 20A, RS-PRO 750-0951 Heatsink
    4. 2.4 Bode Plots
      1. 2.4.1 30V Input Voltage
      2. 2.4.2 48V Input Voltage
      3. 2.4.3 60V Input Voltage
  7. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 48V Input Voltage
        1. 3.1.1.1 0A Output Current
        2. 3.1.1.2 20A Output Current
      2. 3.1.2 60V Input Voltage
      3. 3.1.3 30V Input Voltage
    2. 3.2 Output Voltage Ripple
    3. 3.3 Input Voltage Ripple
    4. 3.4 Load Transients
  8. 4EMI Measurements
    1. 4.1 Results Summary (CISPR25 Limit lines)
    2. 4.2 Test Setup
    3. 4.3 Monopole Antenna (150kHz – 30MHz)
    4. 4.4 Biconical Antenna (30MHz to 200MHz)
    5. 4.5 Log-Periodic Antenna (200MHz – 1GHz)
    6. 4.6 Horn Antenna (1GHz – 3GHz)

4.5 Log-Periodic Antenna (200MHz – 1GHz)

PMP31349 Noise Floor, CLASS 5 Limit Lines, Horizontal Polarization Figure 4-10 Noise Floor, CLASS 5 Limit Lines, Horizontal Polarization
PMP31349 Noise Floor, CLASS 5 Limit Lines, Vertical Polarization Figure 4-11 Noise Floor, CLASS 5 Limit Lines, Vertical Polarization
PMP31349 Measurement, CLASS 5 Limit Lines, Horizontal Polarization Figure 4-12 Measurement, CLASS 5 Limit Lines, Horizontal Polarization
PMP31349 Measurement, CLASS 5 Limit Lines, Vertical Polarization Figure 4-13 Measurement, CLASS 5 Limit Lines, Vertical Polarization

Comments:

  • The critical points in this frequency range are around 300MHz. These frequencies are related to the rise time of the GaN switch (about 3ns).
  • The bootstrap resistor (in series with the bootstrap capacitor), has a direct impact on these frequency peaks.
  • These critical points fall above the Class 5 limit lines, but are below the Class 3 limit lines.
  • Further board optimization is needed to meet CISPR 25 Class 5.
PMP31349 Measurement, CLASS 3 Limit Lines Figure 4-14 Measurement, CLASS 3 Limit Lines