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

3.7 Overcurrent Protection at OTG Mode

Overcurrent protection was performed at USB Cable end and gradually increase current of E-load at 5V, 9V, 15V, 20V, 28V, 36V, 48V output voltage individually. See Figure 3-57 through Figure 3-63, at OTG mode. BQ25756 regulates the output with Constant voltage and constant current profile, once output current triggers the current limit, the output voltage goes to auto restart.

CH2: Vout, CH4: output current

PMP41115 OTG mode, 50.4V battery, 5V OCP = 3.3AFigure 3-57 OTG mode, 50.4V battery,
5V OCP = 3.3A
PMP41115 OTG Mode, 50.4V Battery, 15V OCP = 3.3AFigure 3-59 OTG Mode, 50.4V Battery,
15V OCP = 3.3A
PMP41115 OTG Mode, 50.4V Battery, 28V OCP = 5.1AFigure 3-61 OTG Mode, 50.4V Battery,
28V OCP = 5.1A
PMP41115 OTG Mode, 50.4V Battery, 48V OCP = 5.05AFigure 3-63 OTG Mode, 50.4V Battery,
48V OCP = 5.05A
PMP41115 OTG Mode, 50.4V Battery, 9V OCP = 3.3AFigure 3-58 OTG Mode, 50.4V Battery,
9V OCP = 3.3A
PMP41115 OTG Mode, 50.4V Battery, 20V OCP = 5.1AFigure 3-60 OTG Mode, 50.4V Battery,
20V OCP = 5.1A
PMP41115 OTG Mode, 50.4V Battery, 36V OCP = 5.1AFigure 3-62 OTG Mode, 50.4V Battery,
36V OCP = 5.1A