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

2.5 Bode Plots

Figure 2-12 through Figure 2-16 show the PMP31114 bode plots.

GUID-20220224-SS0I-KF20-KQ6C-NFHSPDH7Z2V6-low.jpgFigure 2-12 Bode Plot at 3.5-V Input Voltage
GUID-20220224-SS0I-ZR0T-VTXS-FC30F8JW7F5F-low.jpgFigure 2-13 Bode Plot at 6-V Input Voltage
GUID-20220224-SS0I-VH3R-1FLM-WFDVFHDJWSXX-low.jpgFigure 2-14 Bode Plot at 12-V Input Voltage
GUID-20220224-SS0I-PBL0-J1LN-PKVKPBWSHXVX-low.jpgFigure 2-15 Bode Plot at 16-V Input Voltage
GUID-20220224-SS0I-MFWM-R4RW-GVNC4RRHT3FG-low.jpgFigure 2-16 Bode Plot at 28-V Input Voltage

Table 2-1 details a summary of the test results from the bode plots.

Table 2-1 Summary of the Bode Plots Test Results
VIN 3.5 V 6 V 12 V 16 V 28 V
Bandwidth (Hz) 281 913 4581 7427 18620
Phase Margin 87° 93° 78.7 55.3 36.6
Slope (20 dB / decade) –0.93 –0.86 –0.91 –1.1 –1.3
Gain Margin (dB) –13 –14.6 –14.2 –12.9 –9.1
Slope (20 dB/decade) –0.06 –0.474 –1 –1.4 –1.4
Frequency (kHz) 13.4 16.3 24.6 26.5 38.9