Dear Team,
To continue below thread:
https://e2e.ti.com/support/power-management/f/196/p/825012/3051778#3051778
I am not sure the PD's classification resistor's relationship with PSE's Rsense.
I think only PD side's RCLSA and RCLSB related to class 0~8, why it mentions PSE side's110mohm here?
BR
Kevin
Hi Kevin!
The PSE monitors and controls output current by sensing the voltage across the sense resistor. The 2nd column above (Class Current Range) is filled with values for each class based on the default 255 mOhm sense resistor. In order for the PSE to correctly classify connected PDs it must sense voltages corresponding to the default sense resistor value and the default class current range. See the table below -->
If the sense resistance is decreased on the PSE side, the current sent from the PD must increase proportionally for the PSE to correctly classify connected PDs. If the PSE sense resistor is adjusted but the PD class resistors are not the PSE will consistently classify loads as lower classes than they are actually presenting.
Thank you for reaching out to us today and please let us know if you have any more questions!
Aidan Davidson
