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OPA4192: OPA4192 & OPA547 Maximum voltage externally shorted to output

John Gray
Intellectual 310 points
Part Number: OPA4192
Other Parts Discussed in Thread: OPA547,

What is the maximum voltage that can be shorted to the outputs of the OPA4192 and OPA547 from an external power supply that is referenced to the internal PS ground?  Currently there is no specification in the datasheet to guide us.  

Can you address this during normal operation, current limit, and when in thermal shutdown?

Thanks,

John Gray and Nhien Hong

  • 0
    TI__Mastermind 23598 points

    John,

    1. In general, all amplifiers have a built in short circuit protection mechanism.  This will limit the output current in cases where the output is connected to any load or output voltage inside the power supply range.  Thus, if you have an amplifier with +/-15V supplies.  You can short the amplifier output to ground or any signal from -15V to +15V and the short circuit protection will protect the device from damage.
    2. Connecting voltage sources outside the supply range to the output will forward bias the ESD structures in the amplifier output and likely damage the device.
    3. The OPA547 also has a thermal shutdown protection built in.  This will shut down the output stage in cases where excessive output current causes self heating that exceeds the maximum temperature limit.

    I hope this helps!  Best regards, Art