TIDT445 May   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Load Transient Test Circuit
    3. 2.3 Highlighted Products
      1. 2.3.1 LM5137F-Q1 Overview
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Efficiency Data
      2. 3.3.2 Efficiency Graphs
      3. 3.3.3 Output Voltage Ripple
      4. 3.3.4 Thermal Images
      5. 3.3.5 Bode Plots
      6. 3.3.6 Load Transients
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Altium Project
      4. 4.1.4 Gerber Files
      5. 4.1.5 Assembly Drawings
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author

3.3.6 Load Transients

Load transient response is shown in Figure 3-17 and Figure 3-18. Test condition is room temperature, no air flow. Output capacitors are 3pcs ceramic caps for each phase, making a total of 12 × 47μF/1210 caps.

Load transient 1 is 21A-42A-56A-83A-21A, 1μs slew time. Vout is within ±5.3%. Load transient 1 is 21A-83A-56A-42A-21A, 1us slew time. Vout is within ±8.5%.

CH1: output voltage

CH2: voltage signal of SHUNT R49

M: math curve based on CH2/0.01+21

In which:

0.01 is SHUNT R49’s resistance 0.01Ω.

21 is 21A electric load.

PMP41158 Load Transient 1Figure 3-17 Load Transient 1
PMP41158 Load Transient 2 Figure 3-18 Load Transient 2