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TVS3300: Can TVS3300 be used for surge protection of DCDC converter connected to 24V motor?

Kazuya Nakai59
Guru 21675 points
Part Number: TVS3300

Hello guys,

One of my customers is looking for surge protector for DCDC converter connected to 24V motor VM (motor power supply terminal).

The motor generates up to 30V to VM as back electromotive force. Also the current is up to 3A.
They think TVS3300 may be used for the DCDC converter protection.

Is their thought correct?

If the answer is no, could you please tell me any TI recommended device for the protection?

Your reply would be much appreciated.

Best regards,
Kazuya. 

  • 0
    TI__Mastermind 18430 points

    Hi Kazuya,

    The TVS3300 should be able to handle this if the pulse width is in the us range. Is there an example waveform of this back EMF? 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Guru 21675 points

    Hi Sebastian,

    Thank you very much for your reply and I'm sorry to be late my response.
    They don't have the waveform but they told me the pulse width is less than 10us.
    Also the EMF sometimes reach to 70~80V.

    Q1. Can TVS3300 handle the pulse width and peak voltage?
    Q2. Is there a limit of the number of times this device will handle the pulse?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 18430 points

    Hi Kazuya,

    The pulse you describe should be within the capabilities of our device, it would be good to test this in the lab to confirm however.

    There would definitely be a limit to the number of consecutive strikes. As with other transients, consecutive pulses will cause more strain to the device and it would eventually fail. 

    Regards,

    Sebastian