TIDT419 January   2025

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 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
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Charge Time and Holdup Time
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Input and Output Voltage Ripple
      1. 3.2.1 Buck Converter
      2. 3.2.2 Boost Converter
    3. 3.3 Load Transients
    4. 3.4 Start-up Sequence

2.4 Charge Time and Holdup Time

Figure 2-5 shows the supercapacitor charge time waveform.

PMP23518 Supercapacitor Charge Time to 2.0V
Ch 1: Input voltage, 5V/div; Ch 2: Supercapacitor voltage, 500mV/div; 20s/div. Measured 103.7 seconds
Figure 2-5 Supercapacitor Charge Time to 2.0V

Figure 2-6 through Figure 2-15 show the output holdup time waveforms.

PMP23518 Output Holdup Time, 0.1A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 123.1 seconds
Figure 2-6 Output Holdup Time, 0.1A Load
PMP23518 Output Holdup Time, 0.2A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 60.7 seconds
Figure 2-7 Output Holdup Time, 0.2A Load
PMP23518 Output Holdup Time, 0.3A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 39.4 seconds
Figure 2-8 Output Holdup Time, 0.3A Load
PMP23518 Output Holdup Time, 0.4A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 28.7 seconds
Figure 2-9 Output Holdup Time, 0.4A Load
PMP23518 Output Holdup Time, 0.5A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage: measured 22.1 seconds
Figure 2-10 Output Holdup Time, 0.5A Load
PMP23518 Output Holdup Time, 0.6A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 17.7 seconds
Figure 2-11 Output Holdup Time, 0.6A Load
PMP23518 Output Holdup Time, 0.7A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 14.5 seconds
Figure 2-12 Output Holdup Time, 0.7A Load
PMP23518 Output Holdup Time, 0.8A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 12.2 seconds
Figure 2-13 Output Holdup Time, 0.8A Load
PMP23518 Output Holdup Time, 0.9A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 10.5 seconds
Figure 2-14 Output Holdup Time, 0.9A Load
PMP23518 Output Holdup Time, 1A Load
Ch 1: Supercapacitor voltage; Ch 2: Output voltage; measured 9.1 seconds
Figure 2-15 Output Holdup Time, 1A Load