TIDT403 August   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
    4. 1.4 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Performance
    4. 2.4 Bode Plots
    5. 2.5 Light Load Efficiency Optimization
    6. 2.6 Switching Frequency Choice
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Overcurrent Protection
    4. 3.4 Load Transients
    5. 3.5 Turn ON and OFF
  8. 4References
  9.   Trademarks

2.6 Switching Frequency Choice

As shown in Figure 2-14, the efficiency at 200KHz is 2% lower than 100KHz, and the efficiency at 300KHz is 5% lower than 100KHz. Meanwhile, considering the magnetic volume at 100kHz, 200kHz, and 300kHz, the 200kHz switching frequency is preferred.

Note: The efficiency is tested with the same transformer mentioned above.
PMP41078 Efficiency Versus Switching Frequency Figure 2-14 Efficiency Versus Switching Frequency
PMP41078 Magnetic Volume Versus Switching Frequency Figure 2-15 Magnetic Volume Versus Switching Frequency