Please see my customers questions below.
On this new project, we use a DisplayPort input connector that can source or sink power (like USB-C). This is not compliant with displayport because Displayport does not sink power from cable.
When the product is powered on, the system 3.3V provide power (500mA max) to the DisplayPort connector.
The Circuit that can be powered by the system 3.3V or DisplayPort cable need to be powered by the system 3.3V (priority system 3.3V).
When the product is powered down, the DisplayPort cable provide power to the circuit but no power should go to the system 3.3V.
The diodes A and B can be replaced by a power mux like the TPS2116
The diode C can be replaced with an eFuse.
We already use a TPS259474AR on this project. I am wondering if I can replace all diode by this part.
Here my concern:
For the circuit C (diode C), if I use a TPS259474AR, what happens if the voltage from the DisplayPort cable is lower than the system 3.3V? Does the eFuse goes in overcurrent mode? Do you have a better solution?
For the circuit A and B, I can replace that by a power mux but I saw that the TPS259474AR can be use (qty 2) to do the same thing. I want a Seamlessly Transition. Is that a good solution or there is a better solution?
DisplayPort source and sink must provide 3.3V to their connector. The standard say that the DisplayPort cable should no connect the power together but some cable has the pin 20 connected together so this situation can happen on any DisplayPort system.
Parts like TPS2530 provide reverse blocking only when disable.
