TIDT279 October   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Power and Load Connections and Test Points
    2. 1.2 Voltage and Current Requirements
    3. 1.3 Required Equipment
    4. 1.4 Considerations
    5. 1.5 Board Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency and Loss Graphs
    2. 2.2 Thermal Images
    3. 2.3 Bode Plots
    4. 2.4 Conducted Emissions vs CISPR Class 5
  6. 3Waveforms
    1. 3.1 Output Voltage Ripple
    2. 3.2 Load Transients
    3. 3.3 Start-Up of Each Independently-Controlled Output

3.3 Start-Up of Each Independently-Controlled Output

Start-up behavior is shown in the following figures.

GUID-20220913-SS0I-MX5Q-ZZSW-KPFKJC4PZT0H-low.png
Enable going high: Red trace is the enable signal, the dark blue trace is VOUT, and the light blue trace is the load current. Smooth VOUT rise in under 2.5 ms with no overshoot seen.
Figure 3-6 Start-Up 3.3-V No-Load Off 14 VIN From 3.3 V
GUID-20220913-SS0I-S5ZD-9ZPB-CPKL40KV22PV-low.png
Enable going high: Enable going high: the red trace is the enable signal, the dark blue trace is VOUT, and the light blue trace is the load current. Smooth 5 VOUT rise in under 3 ms with no overshoot seen.
Figure 3-7 Start-Up 5-V No-Load off 14 VIN From 5 V
GUID-20220913-SS0I-RMPD-KG7X-J0V8GGVMR5CQ-low.png
Enable going high: Enable going high: the red trace is the enable signal, the dark blue trace is VOUT, and the light blue trace is the load current. Smooth 8 VOUT rise in under 10 ms with no overshoot seen.
Figure 3-8 Start-Up 8-V No-Load off 14 VIN From 8 V