TIDT353A September   2023  – June 2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Dimensions
    5. 1.5 Test Setup
  7. 2Testing and Results
    1. 2.1 Bode Plots
    2. 2.2 Thermal Images
  8. 3Waveforms
    1. 3.1 Load Transient Response
    2. 3.2 Start-Up Sequence
    3. 3.3 Output Voltage Ripple
  9.   Trademarks

Load Transient Response

This design follows the M-CRPS standard and has tested 5% to 105%, and 20% to 80% load transient response. The test waveforms are shown in the following figures.

In Figure 3-1 and Figure 3-2, channel 1 in dark blue is Vsw of the primary leg; channel 2 in light blue is the PWM of the primary high side; channel 3 in purple is the output voltage AC portion; channel 4 in green is the primary current.

PMP41081 Load Transient: 380 VIN,Load Step: 0 A to 84 A, 2.5 A/μsFigure 3-1 Load Transient: 380 VIN,
Load Step: 0 A to 84 A, 2.5 A/μs
PMP41081 Load Transient: 380 VIN,Load Step: 84 A to 0 A, 2.5 A/μsFigure 3-2 Load Transient: 380 VIN,
Load Step: 84 A to 0 A, 2.5 A/μs

In the following waveforms, channel 1 in dark blue is load current; channel 3 in purple is the AC portion of output voltage; channel 4 in green is primary current.

PMP41081 Load Transient: 380 VIN, Load
                            Step:4 A 10 ms and 88 A 10 ms, 2.5
                        A/μsFigure 3-3 Load Transient: 380 VIN, Load Step:
4 A 10 ms and 88 A 10 ms, 2.5 A/μs
PMP41081 Load Transient: 410 VIN, Load
                            Step:4 A 10 ms and 88 A 10 ms, 2.5
                        A/μsFigure 3-5 Load Transient: 410 VIN, Load Step:
4 A 10 ms and 88 A 10 ms, 2.5 A/μs
PMP41081 Load Transient: 380 VIN, Load
                            Step:17 A 10 ms and 67 A 10 ms, 2.5
                        A/μsFigure 3-7 Load Transient: 380 VIN, Load Step:
17 A 10 ms and 67 A 10 ms, 2.5 A/μs
PMP41081 Load Transient: 410 VIN, Load
                            Step:17 A 10 ms and 67 A 10 ms, 2.5
                        A/μsFigure 3-9 Load Transient: 410 VIN, Load Step:
17 A 10 ms and 67 A 10 ms, 2.5 A/μs
PMP41081 Load Transient: 400 VIN, Load
                            Step:4 A 10 ms and 88 A 10 ms, 2.5
                        A/μsFigure 3-4 Load Transient: 400 VIN, Load Step:
4 A 10 ms and 88 A 10 ms, 2.5 A/μs
PMP41081 Load Transient: 420 VIN, Load
                            Step:4 A 10 ms and 88 A 10 ms, 2.5
                        A/μsFigure 3-6 Load Transient: 420 VIN, Load Step:
4 A 10 ms and 88 A 10 ms, 2.5 A/μs
PMP41081 Load Transient: 400 VIN, Load
                            Step:17 A 10 ms and 67 A 10 ms, 2.5
                        A/μsFigure 3-8 Load Transient: 400 VIN, Load Step:
17 A 10 ms and 67 A 10 ms, 2.5 A/μs
PMP41081 Load Transient: 420 VIN, Load
                            Step:17 A 10 ms and 67 A 10 ms, 2.5
                        A/μsFigure 3-10 Load Transient: 420 VIN, Load Step:
17 A 10 ms and 67 A 10 ms, 2.5 A/μs