TIDT349A January   2024  – December 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 at OTG Mode
    9. 3.9 Short-Circuit Protection at Charge Mode
  8. 4Trademarks

3.7 Overcurrent Protection at OTG Mode

Overcurrent protection was performed at the USB Type-C cable end and the test gradually increased the current of E-load at constant current (CC) mode for 5V, 9V, 15V, and 20V individually, see Figure 3-25 through Figure 3-28. At OTG mode, BQ25756 regulates the output with a CC and constant voltage (CV) profile, once the output current triggers the current limit, the output voltage drops and goes to auto restart if the voltage hits 80% of Vsys.

PMP41062 OTG Mode, 40Vbat, 5Vsys,OCP = 3.3AFigure 3-25 OTG Mode, 40Vbat, 5Vsys,
OCP = 3.3A
PMP41062 OTG Mode, 40Vbat, 15VsysOCP = 3.1AFigure 3-27 OTG Mode, 40Vbat, 15Vsys
OCP = 3.1A
PMP41062 OTG Mode, 40Vbat, 9VsysOCP = 3.1AFigure 3-26 OTG Mode, 40Vbat, 9Vsys
OCP = 3.1A
PMP41062 OTG Mode, 40Vbat, 20VsysOCP = 5.1AFigure 3-28 OTG Mode, 40Vbat, 20Vsys
OCP = 5.1A