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LM5180-Q1: Pin FMEA

K.Hamamoto
Guru 12155 points
Part Number: LM5180-Q1

Hi Team,

Our customer required Pin FMEA data of this device and they also asked us about following question. (Do you have Pin FMEA data?)

1) If #1 pin open , what will be happen? (Does the switching operation stop? or any other phenomenon will be occurred? )

2) If #2 pin open , what will be happen?  (Does the switching operation stop? or any other phenomenon will be occurred? )

    If the over voltage will be happen because #2 open, does this device has any protection or function for that ?

3) If #1 and #2 shorts, what will be happen?

4) If #7 pin short, what will be happen?

    If the over voltage will be happen because #7 short to GND, does this device has any protection or function for that ?

Best Regards,

Koji Hamamoto

  • 0
    TI__Expert 8245 points

    Hi,

    For now we don’t have such data for release, please see answers about some known phenomenons below:

    1. No output voltage, no switching.

    2. Almost no output voltage, abnormal switching pulses.

    3. If #1 shorts to GND, transformer will be damaged. If #2 shorts to GND, device will be damaged.

    4. Almost no output voltage, abnormal switching pulses.

  • 0 in reply to Iven Su
    Guru 12155 points

    Hi Iven,

    Thank you for your support. That’s unfortunate.

    But I understood there is no such FMEA data.

    So, I have some additional question about your answer.

    5. Regarding question #3, I am sorry. My question is not good. It was about between #1 and #2 pin shorted condition. Not #1 to GND, or #2 to GND.

        Does device damages when #1 and #2 pin shorted each other?

    6.Regarding Q#2 and Q#4, is there any possibility to be the over voltage?

      If it yes, does this device has any protection circuit to prevent that?

    Best Regards,

    Koji Hamamoto

  • 0 in reply to K.Hamamoto
    TI__Expert 8245 points

    Hi,

    5. If #1 and #2 pin are shorted each other, internal circuit on Vin to FB will be damaged, so device will damage.

    6. Regarding Q#2 and Q#4, there is little possibility that Vout will be over-voltage. But it really depends whether there is other conditions (like noise coupling, external spikes) at same time because the device is not designed for these kind of fault and its protection.