TIDT320A january   2023  – july 2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Functional Block Diagram
    3. 1.3 Pin Functions
  6. 2Waveforms
    1. 2.1 Switching Frequency and Operating Modes
    2. 2.2 Output Voltage Ripple
    3. 2.3 Load Transients
    4. 2.4 Start-Up Sequence
  7. 3Testing and Results
    1. 3.1 Efficiency Graphs
    2. 3.2 Efficiency Data
    3. 3.3 No Load and OFF State Power Consumption
    4. 3.4 Thermal Images
    5. 3.5 Bode Plots
    6. 3.6 Load Regulation

3.5 Bode Plots

The feedback loop frequency response was measured with 390 VDC input, 3.7-A load on 12VSB and no load on P18V and S12V. Separate measurements were taken with 270 μF of system capacitance and 4700 μF of system capacitance and are shown in the following figures.

Table 3-9 Bode Plot Summary
System Capacitance (μF) Phase Margin (°) Gain Margin (dB)
270 48.9 11.9
4700 116 14.3
GUID-20230104-SS0I-80P8-RCG5-WZMLPXPMKD9H-low.png Figure 3-7 Bode Plot 270-μF System Capacitance
GUID-20230104-SS0I-NPZJ-CLL3-4FRGQFQQH99D-low.png Figure 3-8 Bode Plot 4700-μF System Capacitance