TIDT308 October   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Dimensions
    5. 1.5 Test Setup
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
      1. 2.3.1 Top Side
      2. 2.3.2 Bottom Side
    4. 2.4 Bode Plots
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Secondary Side
      2. 3.1.2 Primary Side
        1. 3.1.2.1 Transistor Q8 Drain-Source
        2. 3.1.2.2 HS2-Pin of U1
          1. 3.1.2.2.1 Undershoot
          2. 3.1.2.2.2 Overshoot
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-Up Sequence
      1. 3.4.1 Full Load
      2. 3.4.2 Zero Load
      3. 3.4.3 Overload
    5. 3.5 Shutdown Sequence

1.5 Test Setup

  1. Connect the source VS1 to P1 (positive) and P3 (negative).
  2. Add an electrolytic capacitor (> 1 mF, ESR < 30 mΩ) close to input terminals in case long cables from VS1 are used
  3. Connect the load EL1 to P4 and P7 (P7 is the secondary side ground)
  4. Attach a current probe in series to EL1 to measure the output current during load transients
  5. Turn on VS1
  6. Increase the load current (maximum current 2.5 A)