TIDT417 November   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
    5. 1.5 Test Setup
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-up Sequence

3.2 Output Voltage Ripple

Output voltage ripple is shown in Figure 3-2 and Figure 3-3, where VSYS equals 3.75V and ISYS equals 3A. Note that the oscillations in the output voltage ripple are inherent to the BQ25638 and the small inductor value. The device outputs a 3.75VDC within reason.

PMP23456 Output Voltage Ripple at VBUS = 5VFigure 3-2 Output Voltage Ripple at VBUS = 5V
PMP23456 Output Voltage Ripple at VBUS = 9VFigure 3-3 Output Voltage Ripple at VBUS = 9V