TIDT399 July   2024

 

  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
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Thermal Images
    3. 2.3 Bode Plots
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-Up Sequence
  8.   Trademarks

3.4 Start-Up Sequence

Figure 3-11 to Figure 3-14 show the output voltage start-up waveforms at 12V input and –7.5V and –12V output with the converter starting up into no load and into 4A constant-current load using the electronic load. The board Enable is pulled high, by connecting Enable to +Vin, applying the Vcntl voltage corresponding to the desired output voltage, then turning the benchtop power supply on.

PMP23241 Start-Up Into No Load, 12V Input, –7.5V Output, Start-Up Initiated Through Input Supply Power-Up (Enable Signal Already set High by Connecting to +VIN) Figure 3-11 Start-Up Into No Load, 12V Input, –7.5V Output, Start-Up Initiated Through Input Supply Power-Up (Enable Signal Already set High by Connecting to +VIN)
PMP23241 Start-Up Into 4A Load, 12V Input, –7.5V Output, Start-Up Initiated Through Input Supply Power-Up (Enable Signal Already set High by Connecting to +VIN) Figure 3-12 Start-Up Into 4A Load, 12V Input, –7.5V Output, Start-Up Initiated Through Input Supply Power-Up (Enable Signal Already set High by Connecting to +VIN)
PMP23241 Start-Up Into No Load, 12V Input, –12V Output, Start-Up Initiated Through Input Supply Power-Up (Enable Signal Already set High by Connecting to +VIN)Figure 3-13 Start-Up Into No Load, 12V Input, –12V Output, Start-Up Initiated Through Input Supply Power-Up (Enable Signal Already set High by Connecting to +VIN)
PMP23241 Start-Up Into 4A Load, 12V Input, –12V Output, Start-Up Initiated Through Input Supply Power-Up (Enable Signal Already set High by Connecting to +VIN)Figure 3-14 Start-Up Into 4A Load, 12V Input, –12V Output, Start-Up Initiated Through Input Supply Power-Up (Enable Signal Already set High by Connecting to +VIN)