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Thread: IRS2113 SD pin noise sensitivity

  1. #1
    New Member New Member fourtytwo is on a distinguished road
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    IRS2113 SD pin noise sensitivity

    Just a note for other users, I recently changed from using an IRS2110 (lower floating voltage version) and encountered a persistent fault in an H-bridge
    where it looked like high side UVLO (the high side just stopped working) even though the low side continued working. I spent ages scoping the high side
    and changing components in the boost circuit to no avail. Eventually in desperation I grounded the previously floating Sd pin and the fault went away!
    I should emphasize this was a swap from an IRS2110 to an IRS2113 in the same pcb in a previously working circuit. Both date codes concerned 713P
    so it seems maybe I was lucky before or the 2113 is more sensitive, in either case I would never rely on the internal pulldowns again.

    Has this site never heard of an editor that wraps!

  2. #2

    Infineon Employee
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    Srivatsa is on a distinguished road
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    What is the VDD and VCC voltage in your design?

    The Sd pin has a weak pull down internally. It is recommended to ground the pin if unused.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3
    New Member New Member fourtytwo is on a distinguished road
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    Hello, my VCC is 12V & VDD is 3V3.

    Unfortunately the data sheet implies grounding is unnecessary and I think I left it floating for future use however on closer inspection of the data sheet it seems the pulldown resistance is undefined! At best there is a TYPICAL value for input leakage but no minimum.....

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