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LM2678: About short test of LM2678SD-ADJ

Uchida Yasuhide
Prodigy 180 points
Part Number: LM2678
Other Parts Discussed in Thread: LM76005,

Hi,

I have two questions about the LM2678SD-ADJ.

Q1:Does the LM2678SD-ADJ have a risk of internal circuit short between Vin(Input) and Vout(Switch output) ?

Q2:Could you give me the report of matrix short test(combination of all pins) for LM2678SD-ADJ?

Best Regards

  • 0
    TI__Guru 50120 points

    Hi,

    Given that the LM2678 is an older device and may not have functional safety documentation, I would suggest you look at the LM76005 which is a 60V/5A buck converter.

    The LM76005 also has the functional safety document handy to help get a better understanding of the device's operation from different pin failure mode conditions.

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 180 points

    Thank you for your reply.

    I am using the LM2678 already.

    Could you confirm the answer of my two questions?

  • +1 in reply to Uchida Yasuhide
    TI__Guru 50120 points

    Hi,

    1. In basic operation, there is no risk of internal circuit short between VIN and VOUT. There may be external applications that call be VOUT short to battery but that is an application test and not related to the device itself.

    2. There is no existing literature of this matrix of this on the LM2678. What I can say based on the device pinout is that if Pin 1 (Switch_output) is accidently shorted to Pin 2 (input) from soldering then there may be some damage to the internal FET. Since this is a switching buck regulator, you can apply the same engineering judgment if you read the LM76005 functional safety document for SW short to VIN or GND. 

    Regards,

    Jimmy