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TPS23861 Auto mode

Other Parts Discussed in Thread: TPS23861

Dear Sir 

Due to our power supply only 76W

if I would like to keep TPS23861 support 4port 802.3af only in Auto-mode

How could I do?? Change the Rsen from 255mohm to 510mohm ??

If I can't use Auto mode to do 802.3af mode 

How could I setting MCU ,fixed TPS23861 support 4 port 802.3af only 

Thanks