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TPS65987D: VBUS transient protection

Knut Gabrielsen
Prodigy 11 points
Part Number: TPS65987D
Other Parts Discussed in Thread: TVS2200, TVS0500

Question regarding transient protection of TPS65987D

In the datasheet section 9.2.1 different types of transient protection are mentioned on VBUS:

Ref. www.ti.com/.../tps65987d.pdf

- 10nF caps close to VBUS pins

- Schotky diode

- TVS diode

- Snubber circuit

Is TI recommending all four protection mechanisms, or would 10nF x 4 + Schotky diode typically be sufficient.

What would be the recommendation for a system that is spec'ed for 5V, 3A power delivery?

Many Thanks!

  • 0
    TI__Mastermind 32441 points

    Knut,

    We strongly recommend that you use a TVS2200 or a very closely spec'd replacement as your protection diode.  It you use this diode along with the 10nFx4, you will have sufficient protection for your device.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Prodigy 11 points

    Hi Chuck,

    Thank you for your answer. In our case the output voltage will always be max 5V, not 20V. In this scenario I wonder if TVS0500 (5-V Flat-Clamp Surge Protection Device) would be more suitable than TVS2200 (22-V Flat-Clamp Surge Protection Device)?

    Many thanks for your feedback and insight!

    Best Regards,

    Knut

  • +1 in reply to Knut Gabrielsen
    TI__Mastermind 32441 points

    Knut,

    All type C connected devices have to be tolerant of 20V connections, so clamping at a lower voltage will not benefit the system and may cause issues with other components.  

    All of TI's TypeC PD controllers have over voltage protections that will protect the system from over voltage conditions, the TVS diode is intended to provide inrush and surge protection.

    We have done very extensive testing with the TVS2200 and have a huge customer base using it successfully, so I do not recommend changing from this device.

    Regrads,

    Chuck