TIDT286 June   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 Graph
    2. 2.2 Loss Graph
    3. 2.3 Load Regulation
    4. 2.4 Line Regulation
    5. 2.5 Thermal Images
      1. 2.5.1 0.5-A Output Current
      2. 2.5.2 1-A Output Current
      3. 2.5.3 1.5-A Output Current
      4. 2.5.4 2-A Output Current
      5. 2.5.5 Pulsed Ouput Current
    6. 2.6 Bode Plots
      1. 2.6.1 6-V Input Voltage
      2. 2.6.2 12-V Input Voltage
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Transistor Q1
        1. 3.1.1.1 Drain - Source
        2. 3.1.1.2 Gate - Source
      2. 3.1.2 Diode D3
    2. 3.2 Input Voltage Ripple
      1. 3.2.1 20-MHz Bandwidth
      2. 3.2.2 Full Bandwidth
    3. 3.3 Output Voltage Ripple
    4. 3.4 Load Transients
      1. 3.4.1 Switching Load From 1 A to 2 A
      2. 3.4.2 Switching Load From 0.2 A to 2 A
        1. 3.4.2.1 50% Duty Cycle
        2. 3.4.2.2 Low Duty Cycle (TON = 3 ms; TOFF = 30 ms)
    5. 3.5 Start-Up Sequence
    6. 3.6 Shutdown Sequence

3.5 Start-Up Sequence

For the waveforms in this section, the electronic load was set to 2 A and the power supply was plugged in.

The soft start takes 10 ms at maximum load.

GUID-20220524-SS0I-X9GQ-GVHQ-JHRZDXCDSBWM-low.png

C1 ⇒ VIN

5 V / div


                                
C2 ⇒
                                        VOUT

                                
5 V / div

                                

                                
2 ms / div

                                
20-MHz
                                    bandwidth

                            		
                        

                    

            

                
            Figure 3-13 Start-up With 12-V Input
                    Voltage