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TPL7407L is burned

Mickey Zhang
Genius 12080 points
Other Parts Discussed in Thread: TPL7407L

Hi Team,

The customer is using TPL7407L. But TPL7407L is burned in his board. Here are the schematic. The EN pin is connected to the Relay5 pin. Look the attachment.

Can you tell me why TPL7407L is burned?

Thanks,

Best Regards,

  • 0
    TI__Guru** 114905 points
    Hi Mickey,

    Our expert has been notified and should reply soon.

    While waiting, can you find out:
    1) What is the part number of the relay
    2) How much current does the relay require when activated?
    3) How many relays are being activated simultaneously
    4) Is there a bulk capacitor on the +12 (COM) signal and what is the value
    5) What is the other side of the relay coil connected to?
  • 0 in reply to Rick Duncan
    TI__Mastermind 24975 points

    Hello Mickey,

    Just based on an initial look at the provided schematic, I do not see any issues that immediately stand out. 

    My initial guess is that the device is sinking too much current. Beyond what is recommended per channel or for the device as a whole.

    Please provide the information that Rick has requested, in addition to how often each of the relays are being activated.

    Best,
    Michael