TIDT351 September   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Considerations
    3. 1.3 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency and Loss Graph
      1. 2.1.1 Efficiency
      2. 2.1.2 Loss
    2. 2.2 Load Regulation
      1. 2.2.1 18-V Output Voltage (VOUT-A)
      2. 2.2.2 12-V Output Voltage (VOUT-B)
    3. 2.3 Line Regulation
      1. 2.3.1 18-V Output Voltage (VOUT-A)
      2. 2.3.2 12-V Output Voltage (VOUT-B)
      3. 2.3.3 Efficiency and Loss vs Line Variation
    4. 2.4 Cross Regulation
      1. 2.4.1 12-V Output With No Load
        1. 2.4.1.1 Effects on the 18-V Output
        2. 2.4.1.2 Effects on the 12-V Output
      2. 2.4.2 18-V Output With no Load
        1. 2.4.2.1 Effects on the 12-V Output Voltage
        2. 2.4.2.2 Effects on the 18-V Output Voltage
    5. 2.5 Thermal Images
  7. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Primary Switching Node
        1. 3.1.1.1 8-V Input Voltage
          1. 3.1.1.1.1 Full Load
          2. 3.1.1.1.2 No Load
        2. 3.1.1.2 36-V Input Voltage
          1. 3.1.1.2.1 Full Load
          2. 3.1.1.2.2 No Load
      2. 3.1.2 Diode D3 Referenced to VOUT-B (12 V)
        1. 3.1.2.1 8-V Input Voltage
          1. 3.1.2.1.1 Full Load
          2. 3.1.2.1.2 No Load
        2. 3.1.2.2 36-V Input Voltage
          1. 3.1.2.2.1 Full Load
          2. 3.1.2.2.2 No Load
      3. 3.1.3 Diode D4 Referenced to VOUT-A (18 V)
        1. 3.1.3.1 8-V Input Voltage
          1. 3.1.3.1.1 Full Load
          2. 3.1.3.1.2 No Load
        2. 3.1.3.2 36-V Input Voltage
          1. 3.1.3.2.1 Full Load
          2. 3.1.3.2.2 No Load
    2. 3.2 Input Voltage Ripple
    3. 3.3 Output Voltage Ripple
      1. 3.3.1 VOUT-A (18 V)
      2. 3.3.2 VOUT-B (12 V)
    4. 3.4 Load Transients
      1. 3.4.1 Switching on VOUT-A (18 V)
        1. 3.4.1.1 Effects on VOUT-A
        2. 3.4.1.2 Effects on VOUT-B
      2. 3.4.2 Switching on VOUT-B (12 V)
        1. 3.4.2.1 Effects on VOUT-B
        2. 3.4.2.2 Effects on VOUT-A
    5. 3.5 Start-Up Sequence
      1. 3.5.1 Full Load
      2. 3.5.2 No Load
    6. 3.6 Shutdown Sequence

3.4.1.1 Effects on VOUT-A

GUID-20230823-SS0I-DQZ6-CSTW-0NMKKPGDH07P-low.png

VOUT-A

100 mV / div


                                
IOUT-A

                                
20 mA / div

                                

                                
1 ms / div

                                
10-kHz bandwidth

                            		
                        

                    

            

                
            Figure 3-16 Transient on VOUT-A ⇒ VOUT-A