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TPD4S009: is the ESD protection IC looks like its on the wrong side of the power input choke from the PC USB side?

Mukesh Chaudhari
Prodigy 70 points
Part Number: TPD4S009
Other Parts Discussed in Thread: TUSB4020BI

Hello All,

I am using TPD4S009 in one of my USB HUb design for ESD protection on data lines D+ and D-.

I am also using the Common mode chock filter on Power and Ground lint to protect from any EMC noise.

EMC Chock X7 in a red block and the ESD ICS X4 and X5 in a yellow box in 

In this PCB EMC Common Mode chock X7 is used before the ESD IC TPD4S009 X4 and X5.

Is it make any problem with ESD protection?

Also, Is is the acceptable design for ESD in USB 2.0 HUB?

Thanks 

  

  • 0
    TI__Genius 12410 points

    Hello,

    It depends on what type of common mode choke you have. The ESD device TPD4S009 has 0.8pF of cap on the line plus whatever loss the CMC has will let you know if you can pass the signals undisturbed.

    Also it is much more difficult to judge a layout than a layout an schematic for ESD. If you would like you could email me the schematic at c-phillips@ti.com

  • 0 in reply to Cameron Phillips
    Prodigy 70 points
    Hello,

    I need some more information on TUSB4020BI forced reset.

    I am usinfg the FUSB30 USB switch IC to switch between two Upsterm USB.

    But when i am switching between the PCs I am getting delay of 5 to 10s to my dwon streem ports works.

    I think reseting the TSB4020BI at every time when switching the PC Will help to overcome this delay.

    can you please assist me to this

    Thanks
  • 0 in reply to Mukesh Chaudhari
    TI__Genius 12410 points
    Following up through email. I will close this thread now.
  • 0 in reply to Cameron Phillips
    Prodigy 70 points
    Hello Philip,

    Do you have any suggestion on below.

    Hello,

    I need some more information on TUSB4020BI forced reset.

    I am usinfg the FUSB30 USB switch IC to switch between two Upsterm USB.

    But when i am switching between the PCs I am getting delay of 5 to 10s to my dwon streem ports works.

    I think reseting the TSB4020BI at every time when switching the PC Will help to overcome this delay.

    can you please assist me to this

    Thanks