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ESD protection for battery in floating condition

David Park
Expert 5440 points

With ISO72xx devices, customer has a ESD test in condition of VCC and GND floating.

It's in abnormal condition but competitor can pass this test.

ESD level is +/-6kV.

Already tried to add TVS diode and capacitor, add series ferrite bead, but ESD damage is still remained.

How can protect ISO72xx in floating condition?

  • 0
    TI__Genius 14890 points

    David,

     

    Sorry for the delay in response. We have assigned an engineer to this question and they will respond shortly.

  • 0 in reply to Alexander Scheuermann
    TI__Genius 9615 points

    David,

    for external ESD-protection, it always has to be faster than the internal ESD-structures of the part to be protected. This is a challenge already.

    However, what all ESD-structures have in common, is that they create a conducting, low impedance path to GND (and/or) VCC to dissipate the excessive charge. Since in you case - as far as I understand the test-setup - Power and GND is floating, there is no way (or only the decoupling capacitor) to take this charge.

    You may want to try increasing the decoupling capacitor (ideally paralleling several of them to minimize ESR and ESL), but I can't say if this will be sufficient.

    BR,

    Frank