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TPD3S713A-Q1: ESD ratings for DP_IN, DM_IN, VBUS

Fabian Schumacher
Prodigy 30 points
Part Number: TPD3S713A-Q1
Other Parts Discussed in Thread: TPD3S716-Q1,

Tool/software:

Hello,

I have some ESD related questions for the TPD3S713A-Q1. In comparison with a similar USB protector TPD3S716-Q1 you are not suggesting using a CMC or inductor in the data path. Are these components not needed to achieve the ESD ratings? What is the setup (external components) which was used to achieve the ESD ratings on page 4 of the datasheet.

Why are for the TPD3S713A-Q1 two TVS diodes needed? I understand, that these diodes protect the pins from overvoltage and ringing during short event. In comparison with the datasheet of TPD3S716-Q1 there is the same overvoltage and ringing specified in the datasheet. But there is no need for external TVS diodes. Why are they needed with one IC, but not with another one?

Thanks for your help!

Fabian

  • 0
    TI__Expert 7121 points

    Hi Fabian, 

    1. I don't think the CMC and inductors need to achieve a certain ESD rating.

    2.The setup should be a specialized equipment. You can also check section 4.2 in the 713 reference design as a reference.

    3. The TPD3S713x-Q1 device can withstand high transient voltages up to 18 V. In real application, the ringing can exceed 18 V due to LCR tank ringing, but to make BUS, DP_IN, and DM_IN robust, place one TVS close to the BUS pin, and another TVS close to the BIAS pin. There could be some reasons I don't know to remove the TVS for TPD3S716-Q1, but I feel maybe keep them could be a good idea.

    Best Regards,

    Ke Wang