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)

4.3 Monopole Antenna (150kHz – 30MHz)

PMP31349 Noise Floor, CLASS 5 Limit Lines Figure 4-3 Noise Floor, CLASS 5 Limit Lines
PMP31349 Measurement, CLASS 5 Limit Lines Figure 4-4 Measurement, CLASS 5 Limit Lines

Comments:

  • The fundamental switching frequency (about 350kHz), remains above the LW band (150kHz – 300KHz).
  • The 2nd and 3rd harmonics fall inside the MW band (530kHz – 1.8MHz).
  • 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 4-5 Measurement, CLASS 3 Limit Lines