SLVUBI1 May   2021

 

  1.   Trademarks
  2. 1TPS7H4002EVM-CVAL Overview
    1. 1.1 Features
    2. 1.2 Applications
  3. 2TPS7H4002EVM-CVAL Default Configuration
  4. 3TPS7H4002EVM-CVAL Initial Setup
  5. 4TPS7H4002EVM-CVAL Testing
    1. 4.1 Output Voltage Regulation
    2. 4.2 Output Voltage Ripple
    3. 4.3 Soft Start-up
    4. 4.4 Transient Response to Positive/Negative Load Step (0 A to 3A to 0A)
    5. 4.5 Input Voltage Ripple
    6. 4.6 Loop Frequency Response
    7. 4.7 Current Limiting
  6. 5TPS7H4002EVM-CVAL EVM Schematic
  7. 6TPS7H4002EVM-CVAL Bill of Materials (BOM)
  8. 7Board Layout

Transient Response to Positive/Negative Load Step (0 A to 3A to 0A)

  • Configure e-load to switch between 0 A and 3 A at a rate of 1 A/µs.
  • On the oscilloscope, display CH2 (VOUT) [AC coupled, 50 mV/div] and CH3 (Output Current Probe) [1 A/div, trigger rising edge ≈ 120 mA] with 20 µs/div.

Figure 4-4 shows the response to this load step to be about 50mV, or 2%.

GUID-20210517-CA0I-JS3P-KCVS-7NTZTQBPL0VF-low.pngFigure 4-4 Transient Response to Load Step 0 A to 3 A at 1 A/µs
  • Change the trigger on CH3 to falling edge to capture the transient response of VOUT to negative current step from 3 A to 0 A as shown in Figure 4-5.

    Again, transient deviation is approximately 50 mV, ignoring peak envelope, or 2%.

GUID-20210517-CA0I-P1SR-B9VX-NCVGHDGTVWVC-low.pngFigure 4-5 Transient Response to Load Step 3 A to 0 A at 1 A/µs