• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 34 subscribers
  • Views 381 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS26C32AT: Industrial surge,device burn

Rhea Gao
Expert 2570 points

Part Number: DS26C32AT
Other Parts Discussed in Thread: AM26C32,

Hi ，

I used DS26C32AT and AM26C32 to burn when doing surge. The attachment is designed for this part of the schematic diagram. Later, TVS tube(small tube similar to ESD with low power) is added to the place where the signal comes in. To do the surge, the device will still be damaged.So how much power TVS is needed to prevent industrial surge? Is there a good solution to this problem? 

DS26c32at AM26c32.docx

Many thanks~

  • 0
    TI__Genius 15345 points

    Hello,


    An engineer has been assigned to this thread. Because of the holidays, TI E2E design support forum responses may be delayed through Jan. 3. Thank you for your patience.

    Best,

    Chris

  • 0
    TI__Guru 54022 points

    Hi Rhea,

    So there are a few things that can be done to help protect from surge on these devices:

    1. This IC is not surge rated - so if any overvoltage occurs it will be converted to a current that will be shunted to protect the communication node. Our general approach to surge protection on non-surge devices looks like below:

    Where termination and bias resistors would be added between R1/R2 and TVS diode. R1 and R2 are between 10 and 100 ohms and are thick pulse proof resistors to help protect the device. 

    So I'd suggest a protection scheme something like this to help protect the device. The TVS or surge diode used is going to depend on power input into the input at worst case conditions as clamping voltage should be within rating to protect the device from damage. 

    Is this something that is possible for your system?

    Also if I could ask why you are using this device - we do have differential devices that have surge protection built in that may benefit the applications depending on exact needs - i.e. if you need the multi-channel setup and can't do multiple device that its probably better to implement a protection scheme as described above  - but any flexibility may give more design choices. 

    Please let me know!

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    Expert 2570 points

    Hi Parker,

    My customer did not reply any information, they would like to directly help with the TVS model suggested.

    Thank you !

  • 0 in reply to Rhea Gao
    TI__Guru 54022 points

    Hi Rhea,

    Generally the part that we suggest a lot is the CDSOT23-SM712 - which is a RS-485 specific protection diode - which will also work for this device -  and one of the recommended  resistors is (thick film in 0603 package) CRCW060310R0JNEAC - this is 10 Ohms. This is our general approach for this type of protection. 

    Best,

    Parker Dodson