TIDT412B October   2024  – December 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 Images
    4. 2.4 Bode Plots
    5. 2.5 PWM Duty Cycle Versus Output Voltage
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Transitions
    3. 3.3 Load Transients
    4. 3.4 High Current Load Transients
    5. 3.5 Start-up and Shutdown Sequences
    6. 3.6 Overvoltage Protection
    7. 3.7 Reverse Voltage Protection

2.1 Efficiency Graphs

The efficiency and associated power losses of the system are shown in Figure 2-1 and Figure 2-2 respectively. These measurements were taken with an input voltage of 48V across the output voltage range and up to the expected nominal load (7A).

According to Figure 2-1, when operating at the nominal load of 7A, the efficiency can range from 90%, when the output voltage is 6V, to 97%, when the output voltage is 35V. The peak efficiency measured is 97.2% with an output voltage of 35V and a load of 9A.

PMP23468 Efficiency at 6, 20, and 35VOUT from 0A to 9A Figure 2-1 Efficiency at 6, 20, and 35VOUT from 0A to 9A

According to Figure 2-2, when operating at the nominal load of 7A, the expected power losses range from 5W, when the output voltage is 6V; to 8W, when the output voltage is 20V. This can be compared to the no load losses that range from 4.25W, when the output voltage is 6V; to 5.75W, when the output voltage is 20V.

PMP23468 Power Losses at 6, 20, and 35VOUT from 0A to 9A Figure 2-2 Power Losses at 6, 20, and 35VOUT from 0A to 9A