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TPA3116D2: About TPA3116D2 Channel Output PCB Trace Impedance

Part Number: TPA3116D2

Hello,

If 2 channels output 2 RL=4 ohm,50W Speakers, the difference trace OUTPR/OUTNR & OUTPL/OUTNL should be set 100ohm or 4 ohm?

And the OUTPR/OUTNR trace needs to support  about 3.5A current?

Thanks.