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SN65HVD888: SN65HVD888 protection

Rajan
Intellectual 270 points
Part Number: SN65HVD888

Hi,

As per SN65HVD888 datasheet recommended for Transient Protections Against ESD, EFT, and Surge Transients. Accordingly we have provided R1, R2, TVS, TBU1,TBU2 and MOV1, MOV2 components in our design for protection.

One of the reference notes recommended to connect Fast Acting, 3-Electrode 420 V Gas Discharge Tube (2030-42T-SM-RPLF) with respect to GND and data lines.

Is it require for our protection? because RS485 bus network/wiring GND connection is not mandatory, mostly D+ and D- only connected in bus wiring. (chances to miss GND connection in bus cable wiring).

Please provide your suggestion for the same. we need to protect from 230V AC power cross.

Thanks 

Rajan

  • 0
    TI__Guru 62910 points
    Hi Rajan,

    In this case the TBUs (depending on their specs) would likely provide the best protection against AC line shorts. Components that clamp the over-voltages to ground like GDTs and TVS diodes are usually more effective for short-duration transient protection, while series components like TBUs and PTC fuses are usually more effective in limiting the current during long-duration/DC stresses. You may want to use the GDTs if your system needs high levels of surge tolerance (for example, if it is subject to high-energy transients like lightning discharges).

    Regards,
    Max
  • 0 in reply to Max Robertson
    Intellectual 270 points

    Hi Max,

    Thank you for your support,

    As per below datasheet suggestion, We have provided TBU and MOV for our protection from 240VAC power.

    Can you please confirm TBU device will protect from 240VAC cross?

    Thanks 

    Rajan

  • 0 in reply to Rajan
    TI__Guru 62910 points
    Hi Rajan,

    I believe this should be the case based on my understanding of the operation of the device. However, it would be difficult to say for sure without testing it. If you wanted to get more confidence in the design, though, I would recommend contacting the manufacturer of the TBU device to get their feedback; they would be more knowledgeable on it than me.

    Regards,
    Max