Other Parts Discussed in Thread: TPS65988, TPS55288
My company offers a USB-C charging port for use in airplanes that uses the TPS25740B USB Type-C PD source controller.
We are attempting to design a right-angle adapter that would pass the USB-C connection through, while simultaneously illuminating an LED when not in use.
I have experimented with operating TPS25740B in "legacy mode" by simply attaching a 5.6k ohm resistor from one of the CC lines to ground, effectively forcing the TPS25740B to provide a default 5V on the VBUS pin, which we use to illuminate an LED.
While in this mode, I have also hooked up a PassMark PM125 programmable USB load. I have found that the addition of the 5.6k ohm resistor does not appear to impede the TPS25740B's ability to communicate with the programmable load or receive requests for voltage changes.
However, we want to be sure this will work. Can any of you provide any documentation or assurance that operating the TPS25740B in this manner will be reliable long term and will not interfere with the charging of external devices? If we are going to implement this solution, we must have some clear evidence in the form of documentation.
Any resources related to this topic would be welcome. Thank you.