TIDT261 March   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 Load Regulation
    3. 2.3 Line Regulation
    4. 2.4 Thermal Images
      1. 2.4.1 4-V Input Voltage
        1. 2.4.1.1 3-A Output Current – Average Load Current
        2. 2.4.1.2 5-A Output Current – Peak Load Current
      2. 2.4.2 12-V Input Voltage
        1. 2.4.2.1 3-A Output Current
        2. 2.4.2.2 5-A Output Current
      3. 2.4.3 18-V Input Voltage
        1. 2.4.3.1 3-A Output Current
        2. 2.4.3.2 5-A Output Current
    5. 2.5 Bode Plots
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Input Voltage Ripple
    4. 3.4 Load Transients
    5. 3.5 Start-Up Sequence
    6. 3.6 Shutdown Sequence

3.5 Start-Up Sequence

The power supply was plugged in for the waveforms taken in the following images.

6-V Input Voltage

GUID-20220224-SS0I-S7D5-23JJ-QWMRC9VTFGS7-low.jpg
C2 ⇒ input voltage; 2 V / div
C1 ⇒ output voltage; 1 V / div
(All) 2 ms / div; 20-MHz bandwidth
Figure 3-21 Start-up With 6-V Input Voltage

12-V Input Voltage

GUID-20220224-SS0I-7PW9-PFR0-KRS5HCDPKQJ6-low.jpg
C2 ⇒ input voltage; 5 V / div
C1 ⇒ output voltage; 1 V / div
(All) 2 ms / div; 20-MHz bandwidth
Figure 3-22 Start-up With 12-V Input Voltage

18-V Input Voltage

GUID-20220224-SS0I-DJ1V-2V8B-Q3WKTQXF1BGM-low.jpg
C2 ⇒ input voltage; 5 V / div
C1 ⇒ output voltage; 1 V / div
(All) 2 ms / div; 20-MHz bandwidth
Figure 3-23 Start-up With 18-V Input Voltage