TPS23730: TPH/TPL feature when an Non standard PSE plug in

Feng bin Su

Part Number: TPS23730

Hi team,

My customer would like to confirm with you if we connect DC-48V non standard PoE(50W+) into the PD circuit of TPS23730? Will both TPH and TPL at logic high or low? Customer has tried it and the TPH/TPL will active high. Does it make sense for you, too? Thanks.

over 3 years ago

0 Michael Pahl over 3 years ago

TI__Mastermind 21320 points

Hey Ben,

Is this an adapter voltage? Is it connected to APD? Or is this like a PoE injector on the RJ45 input?

If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

Regards,

Michael P.

Applications Engineer

Texas Instruments

0 Feng bin Su over 3 years ago in reply to Michael Pahl

TI__Expert 8370 points

Hi Michael,

Thanks. Please refer the below feedback.

Is this an adapter voltage? Is it connected to APD? Or is this like a PoE injector on the RJ45 input?

There are no adaptor voltage and APD isn't used. They use shottcky diode to do redundant power. Yes, it is like POE injector(non standard) connected to RJ45.

0 Michael Pahl over 3 years ago in reply to Feng bin Su

TI__Mastermind 21320 points

Hey Ben,

Oh okay I understand, then yes this is expected behavior. The TPH and TPL signals are active low. They will only activate according to table 8.2 in the datasheet. The TPH and TPL signals indicate the Type of PSE detected, called mutual identification. However, since the POE injector is simply applying power, the TPH/TPL signals should be high, or inactive.

Does this make sense and is this what the customer sees?