TPS23753AEVM-001: Mag-Jack shield ground connection?

SmartEnrg

Hi,

Referring to TPS23753AEVM-001 Schematic

Pins 11,12 and BST circuit inside RJ45-jack J2 (MJFR0429) are connected to shield ground.
Should that ground in turn need to be connected to one of the isolated/ non-logic side circuit
ground points? If so, which one - Pin 6 or 7 of U1 (TPS23753APW), or VSS_B perhaps?

Please advise. Thanks for your timely attention and help.

Best,
SE

over 4 years ago

0 Thomas Lewis over 4 years ago

TI__Expert 5615 points

SE,

Thank you for your question. Our PoE PD application experts will review it on Monday morning - so expect a reply by Noon US central time on Monday, 9/16.

Thanks again for designing with PoE products from Texas Instruments,

0 Michael Pahl over 4 years ago

TI__Mastermind 21320 points

Hello,

Thank you for your question. Pins 11,12 and BST inside the RJ45-jack are connected to earth ground. They should remain isolated from VSS, RTN, IC ground or the secondary ground. They should have Bob Smith terminations.

For further explanations, please refer to the following paper, section 1.4 Input Section:

Please let me know if you have any additional questions!

Regards,

Michael Pahl

0 SmartEnrg over 4 years ago in reply to Michael Pahl

Expert 1145 points

Thanks Michael,

Is their a way I can submit my schematic for review? Via PM perhaps or other more private setting.
I am looking to release this design for initial build later this week. Would appreciate your feedback.

Best,
SE

0 Michael Pahl over 4 years ago in reply to SmartEnrg

TI__Mastermind 21320 points

Hello SE,

I sent you a connect request. Once you accept we can message privately.

If you feel that we answered this question, please indicate so with the solution button. Thank you!

Regards,

Michael Pahl

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TPS23753AEVM-001: Mag-Jack shield ground connection?