TIDT205 February   2021

 

  1. 1Description
  2. 2Test Prerequisites
    1. 2.1 Voltage and Current Requirements
    2. 2.2 Considerations
    3. 2.3 Dimensions
  3. 3Testing and Results
    1. 3.1 Efficiency Graphs
    2. 3.2 Efficiency Data
    3. 3.3 Load Regulation
    4. 3.4 Thermal Image
    5. 3.5 Bode Plots
    6. 3.6 Conducted Emissions Testing (CISPR 25, Class 5)
  4. 4Waveforms
    1. 4.1 Switching
    2. 4.2 Output Voltage Ripple
    3. 4.3 Load Transients
    4. 4.4 Start-up Sequence
    5. 4.5 Termination Sequence

4.3 Load Transients

An electronic load was used for all testing.

CH 1 (Pink trace) Load Current

CH 3 (Yellow trace): Output Voltage

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A 25% (0.61 A) to 75% (1.82 A) load step was run using an e-load with a 2.5 A/μs slew rate. The overshoot is 114 mV (2.28%), and the undershoot is 110 mV (2.20%).
Figure 4-11 Load Transient
(VOUT = 5 V, IOUT = 0.61 A to 1.82 A).
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A 0% (0 A) to 100% (0.28 A) load step was run using an e-load with a 500 mA/µs slew rate. The overshoot is 46.5 mV (2.58%), and the undershoot is 47 mV (2.61%).
Figure 4-13 Load Transient
(VOUT = 1.8 V, IOUT = 0 A to 0.28 A).
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A 25% (0.5 A) to 75% (1.5 A) load step was run using an e-load with a 2.5 A/μs slew rate. The overshoot is 67 mV (5.70%), and the undershoot is 60.5 mV (5.15%).
Figure 4-15 Load Transient
(VOUT = 1.175 V, IOUT = 0.5 A to 1.5 A).
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A 0% (0 A) to 100% (0.18 A) load step was run using an e-load with a 500 mA/us slew rate. The overshoot is 47.5 mV (1.44%), and the undershoot is 48 mV (1.45%).
Figure 4-12 Load Transient
(VOUT = 3.3 V, IOUT = 0 A to 0.18 A).
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A 0% (0 A) to 100% (0.22 A) load step was run using an e-load with a 250 mA/μs slew rate. The overshoot is 30 mV (2.22%), and the undershoot is 32 mV (2.37%).
Figure 4-14 Load Transient
(VOUT = 1.35 V, IOUT = 0 A to 0.22 A).