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PCM2912A: ESD protection for PCM2912A

user6162521
Prodigy 60 points
Part Number: PCM2912A
Other Parts Discussed in Thread: TPD2E001, TPD1E1B04

Hi 

In our design, PCM2912A is used as USB digital audio chip. 

We hope to add ESD & Surge protection. 

Normally on VBUS, TVS clamping voltage is over 5.25V, sometimes it is around 7,8V(to avoid TVS work in breakdown mode  in normal use).

I want to know when ESD occur, this higher clamping voltage may hurt PCM2912A chip

Maybe it is not a problem because I saw several design is similar.   But anyway, Could you let me know this is a risk or not?

Or other better solution for this? 

Thanks

BR

Kevin

  • 0
    TI__Mastermind 23050 points

    Hi Kevin,

    It would always be ideal if you could clamp the voltage within the abs max listed in the datasheet, but I understand this may not be entirely practical. Some amount of protection like you have mentioned will at least help dissipate the excess energy and reduce the risk of damage. Having proper supply decoupling and possibly a small series resistance may help as well. 

    Unfortunately I don't have an ideal solution for this and there will always be some risk involved. We do have some components intended for applications like this, such as TPD1E1B04 or TPD2E001. You may consider looking into those for your system as well.

    Best,

    Zak