SLUAAY7 November   2024 BQ25756

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Equipment
    1. 2.1 Equipment Setup
    2. 2.2 Evaluation and Results
    3. 2.3 Optional Power Role Swap Test
  6. 3Summary
  7. 4References

2.2 Evaluation and Results

Use the following guidelines to evaluate the full 240W range of USB Extended Power Range (EPR):

  1. Turn the power supply and load on.
  2. Use a USB-C cable, capable of EPR, to connect the USB-C terminal J4 of the source board to the USB-C terminal J4 of the sink board
  3. The two TPS26750 will begin negotiating to establish a PD contract. If the power supply, load, and USB-C cable are capable of EPR. The VBUS of the USB-C cable will go to 5V, then 20V, then 48V.
48V/5A 240W EPR Sink PDO

The VBUS of the USB-C cable ramps up from 0V to 5V, then 5V to 20V, and then 20V to 48V. The CC lines show that the PD controllers are communicating with each other. IBAT/VBAT shows the device is sinking 8A of current to charge the battery that is attached to the sink side

Figure 2-3 48V/5A 240W EPR Sink PDO
48V/5A 240W EPR Source PDO

The VBUS of the USB-C cable ramps up from 0V to 5V, then 5V to 20V, and then 20V to 48V. The CC lines show that the PD controllers are communicating with each other. IBAT/VBAT shows the input power supply is sourcing around 8A of current at 29.4V to the sink device to charge the attached battery.

Figure 2-4 48V/5A 240W EPR Source PDO