I have two questions for the LT4294 application
1. May I know how long does it usually take for the handshaking from detection to power up between a PSE and PD?
If I connect a adaptor (use the Aux pin function) and a PSE to a LT4294 PD device at the same time,
according to the datasheet, the signature res is off and power should be 100% from adaptor
when I remove the adaptor, since I don't want to reset the system, I would need to know the time for handshaking and add it as the holdup time for my DC/DC converter
2. I have a system as the attachement
When the adaptor and Sifos test equip (as a PSE) are both connect to the PD, Sifos failed to detect the signature res of LT4294, but when the adaptor was removed, everything was fine
since the adaptor power is blocked by the Diode Oring and should not have any effect on LT4294, I have no idea what caused the failure of detection,
May I have your suggestion what I should check more for the issue?