TIDT272 April   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Considerations
    3. 1.3 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Load Regulation
      1. 2.3.1 Primary Output
      2. 2.3.2 Secondary Outputs
        1. 2.3.2.1 Positive Outputs
        2. 2.3.2.2 Negative Outputs
    4. 2.4 Line Regulation
      1. 2.4.1 Primary Output
      2. 2.4.2 Secondary Outputs
        1. 2.4.2.1 Positive Outputs
        2. 2.4.2.2 Negative Outputs
    5. 2.5 Thermal Images
    6. 2.6 Bode Plots
      1. 2.6.1 5.5-V Input Voltage
      2. 2.6.2 12-V Input Voltage
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Q1 Drain to GND
      2. 3.1.2 Q1 Gate to GND
      3. 3.1.3 Diode D12
      4. 3.1.4 Diode D9
    2. 3.2 Output Voltage Ripple
      1. 3.2.1 Primary 10 V (Auxiliary)
      2. 3.2.2 Secondary +15 V
      3. 3.2.3 Secondary –5 V
    3. 3.3 Input Voltage Ripple
    4. 3.4 Start-Up Sequence
    5. 3.5 Shutdown Sequence

1.2 Considerations

Keep the following considerations in mind while working with this design:

  • Unless otherwise indicated, input voltage was set to 12 V
  • Resistors were used as load
  • Output currents were set to full load
  • Cut the PCG trace to insert diode D101
  • Measured switching frequency ⇒ 200 kHz
  • Undervoltage lockout ON ⇒ 7 V
  • Undervoltage lockout OFF ⇒ 5 V