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OPA859: PD voltage

zhang ping
Genius 3195 points
Part Number: OPA859

I want to know what is the maximum withstand voltage of PD terminal? For example, 5V or 3.3V will damage the PD pin? If it exceeds 1.8V, will it be considered as enable mode? What happens when the voltage exceeds 1.8V?

  • 0
    TI__Expert 3620 points

    Hi Zhang,

    For power-supply-specific enable and disable thresholds, please refer to section 9.4.2 of the datasheet:

    As for the maximum voltage on the PD pin, I will have to investigate further. Are you planning to intentionally exceed the supply voltage by a significant amount or is this a worst-case failure concern?

    Best,

    Sam

  • 0 in reply to Sam Burnett
    Genius 3195 points

    The operational amplifier power supply is 3.3V, and the PD control signal seems to have overvoltage, with peak to peak 5V. It is suspected that the damage of the chip is related to overvoltage. We need to confirm the maximum withstand voltage of PD;Please help confirm the specific value?

  • 0 in reply to zhang ping
    TI__Expert 3620 points

    Hi Zhang,

    I confirmed the PD pin maximum is the same as the VIN spec:

    Looks like you are violating this spec. One potential work-around is to place a large resistor in series (>1k) with the PD pin to protect the ESD diodes from overcurrent. We can't guarantee performance and reliability in this case, but it can help for debug.

    Best,
    Sam