TIDT407 October   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 Charge Mode Start-Up Waveform
    2. 3.2 OTG Mode Start-Up Waveform
    3. 3.3 Voltage Transition at OTG Mode
    4. 3.4 Ripple and Noise at OTG Mode
    5. 3.5 Load Transients at OTG Mode
    6. 3.6 Switching Waveform
    7. 3.7 Overcurrent Protection at OTG Mode
    8. 3.8 Short-Circuit Protection
  8.   Trademarks

3.6 Switching Waveform

Figure 3-54 through Figure 3-56 show the power stage waveform at different working modes in BQ25756. The switching frequency is set to 300kHz.

  • CH1: Buck leg high-side Vds

  • CH2: Buck leg low-side Vds

  • CH3: Boost leg High-side Vds

  • CH4: Boost leg low-side Vds

PMP41115 Buck ModeFigure 3-54 Buck Mode
PMP41115 Boost ModeFigure 3-56 Boost Mode
PMP41115 Buck-Boost ModeFigure 3-55 Buck-Boost Mode